Lincoln Aviator: Instrumentation, Message Center and Warning Chimes / Description and Operation - Instrument Panel Cluster (IPC) - System Operation and Component Description

System Operation

System Diagram - Gauges

Gas

Hybrid

Network Message Chart - Gauges, Gas

  Module Network Input Messages - IPC

  Module Network Input Messages - PCM

Network Message Chart - Gauges, Hybrid

  Module Network Input Messages - IPC

  Module Network Input Messages - PCM

System Diagram - RTT Indicators

RTT Indicators

RTT Indicators, Hybrid Only

Network Message Chart - RTT Indicators

  Module Network Input Messages - IPC

Hardwired Inputs

The IPC requires hardwired inputs from components that are not on the CAN. These components are required for specific IPC functions.

The hardwired inputs are provided by the following components:

• Fuel pump and sender unit
• Low washer fluid level switch

Networked Input Messages and Default States

NOTE: Whenever a network message is suspected as missing and confirmed by a missing message DTC (U-code), it is important to look for other symptoms that can also be present in the IPC and throughout the vehicle. Once a DTC sets in the IPC, it is helpful to review the complete message list to determine which other modules also rely on the same message and run the self-test for those modules. If the message is missing from other modules, the same or similar lost communication DTC can also be set in those modules. Confirmation of missing messages common to multiple modules can indicate the originating module is the source of the concern or the communication network may be faulted.

For a list of all the network messages,
Refer to: Communications Network - System Operation and Component Description (418-00 Module Communications Network, Description and Operation).

The IPC uses input messages from other modules to control the gauges, informational indicators, warning indicators and message center message displays over the communication networks. The IPC receives all networked data over the HS-CAN3.

The vehicle uses 4 communication networks to transmit the data used by the IPC.

• HS-CAN1
• HS-CAN2
• HS-CAN3
• MS-CAN

For overview information,
Refer to: Communications Network - Overview (418-00 Module Communications Network, Description and Operation).

For system operation information,
Refer to: Communications Network - System Operation and Component Description (418-00 Module Communications Network, Description and Operation).

All messaged inputs to the IPC from other networks are received from the GWM over the HS-CAN3. The GWM, as the name implies, acts as a gateway to convert messages from one of the other 3 networks to the HS-CAN3, which is recognized by the IPC.

Network messages can drop out or be missing for a variety of reasons, such as high network traffic on the bus. The IPC incorporates a defined strategy for handling missing network messages based on time. The required time for a network message to be missing differs between the various gauges, indicators and message center displays. The strategy is basically the same for all indication outputs (gauges, indicators or chimes), but differs in the length of time required for the network message to be missing. If a required network message is missing or invalid for less than the programmed length of time, the gauge, indicator or message center display that requires the network message remains at the last commanded state based upon the last network message received. If the messaged input is missing for longer than the programmed length of time, the IPC output (gauge, indicator) reacts according to a pre-defined default action.

For example, if the stability-traction control indicator request network message is missing for less than 5 seconds, and the stability-traction control indicator (sliding car icon) was on, the indicator remains in the on state until the next network message is received. If the network message remains missing or invalid for more than 5 seconds, the IPC sets a U-code DTC and the IPC output becomes a default action for the indicator or gauge. The indicator may default on/off or the gauge may default to the rest position.

Each indicator or gauge utilizes a different default strategy depending on the nature of the indication. Refer to the diagnostic overview descriptions located before each pinpoint test for further descriptions of the default action specific to each indicator or gauge. If the missing messaged input to the IPC returns at any time, the normal function of the gauge, indicator or message center display resumes.

It is very important to understand:

• where the input originates.
• all the information necessary for a feature to operate.
• which module(s) receive(s) the input or command message.
• which module controls the output of the feature.
• whether the module that receives the input controls the output of the feature, or whether it outputs a message over the communication network to another module.

Startup-Shutdown

The IPC provides a startup/shutdown sequence also known as a welcome/goodbye strategy. The IPC initiates and follows a progressive strategy providing increasing IPC functionality from IPC wake up to ready to drive status. This sequence begins at RKE unlock or driver door open through the ignition RUN state. During this period, the IPC provides increasing functionality from backlighting or illuminating gauge rings, gauge pointers, illuminating the PRND display, backlighting of the message center display, displaying a message center splash screen, gauge and indicator prove out, gauge sweep and finally normal IPC operation.

MyKey®

The MyKey® feature allows the customer to program a restricted driving mode that is tied to one or more keys known as a MyKey® key. The following features are provided by the IPC when a MyKey® key is being used:

• At the beginning of vehicle start up, as part of the welcome strategy, the message center greets the MyKey® driver with MYKEY ACTIVE DRIVE SAFELY displayed in the message center. If the MyKey® speed limiter feature is turned on, the message center also displays the MyKey® administrator selected top speed setting message. The MyKey® top speed selections are; 105, 110, 120 or 130 km/h (65, 70, 75, or 80 mph) or to the administrator desired setpoint.
• The IPC provides a periodic Belt-Minder® warning chime until the driver and passenger seatbelts are buckled. When the Belt-Minder® is issued, the ACM is muted and the message center displays BUCKLE UP TO UNMUTE AUDIO.
• If the MyKey® speed limiter feature is turned on and the vehicle speed approaches the selected top speed (100, 110, 120 or 130 km/h [60, 70, 75, or 80 mph]), the message center displays NEAR VEHICLE TOP SPEED along with a chime.
• If the MyKey® speed limiter feature is turned on and the vehicle speed reaches the selected top speed (105, 110, 120 or 130 km/h [65, 70, 75, or 80 mph]), the message center displays TOP SPEED MYKEY SETTING along with a chime.
• If the speed warning is selected at one of the preset values (75, 90, 105 km/h [45, 55, 65 mph]) and the vehicle approaches the preset speed, the message center displays CHECK SPEED DRIVE SAFELY along with a chime.
• At approximately 1/8 tank of remaining fuel, the IPC illuminates the low fuel message center indicator and the message center displays FUEL LEVEL LOW along with a chime.
• Traction control, Emergency Assist feature and the Do Not Disturb feature can be set to always on or user selectable in the MyKey® menu.
• If the traction control always on feature is turned on and the MyKey® driver attempts to disable the traction control, the message center displays ADVANCETRAC ON MYKEY SETTING.

The following features are provided in the centerstack display when a MyKey® key is being used:

• MyKey® miles driven by the MyKey® user can be found in the information display.
• The number of MyKey® programmed and administrator keys can be found in the MyKey® menu.
• The parking aid, Blind Spot Monitoring System/Cross Traffic Alert (BLIS®/CTA), lane departure alert and collision avoidance warning menus are disabled in the message center to force these features always on.

When an administrator key is in use, the following information is provided in the centerstack display:

• a menu in the message center guiding the user to create a MyKey®. When the maximum MyKey® limit is reached, the MyKey® creation menu is no longer available.
• a menu in the message center with options for setting 6 MyKey® features:
  • MyKey® speed limiter.
  • MyKey® pre-selected speed warning.
  • MyKey® radio volume limiter.
  • traction control always on or user selectable.
  • emergency assist feature always on or user selectable.
  • do not disturb feature always on or user selectable.
• a menu in the message center with the option to clear all MyKey® programmed keys at once.
• MyKey® mileage driven by the MyKey® user can be found in system check function of the message center.
• the number of MyKey® programmed keys and administrator keys can be found in the system check function of the message center.

For information on the MyKey® features, refer to the Owner's Literature.

Configuration

The IPC contains items that are configurable. Some of the configurable items (configurable parameters) are customer preference items which can be set with a diagnostic scan tool. The remaining configurable items can only be set through the vehicle configuration parameters.
Refer to: Module Configuration - System Operation and Component Description (418-01 Module Configuration, Description and Operation).

Prove-Out

The IPC carries out a display prove-out to verify the gauges function and all module controlled warning indicator lamps and monitored systems are functioning correctly within the IPC. Upon initiation of the prove-out, the gauges sweep from one stop to the other then return to the normal indication state based on the input received. The IPC also provides a timed prove-out of some indicators while other indicators illuminate upon engine start up or have no prove-out. When the ignition is cycled on, the indicators illuminate to prove-out according to the following table:

Dealer Test Mode

To enter the IPC engineering test mode or dealer test mode, begin with the ignition off. Press and hold the RH steering wheel switch OK button. Place the ignition on and continue to hold the button for 5-8 seconds until the display indicates ET. Press up or down on the toggle button to navigate through each of the display windows. To exit the IPC dealer test mode, press and hold the OK button for 5-8 seconds or place the ignition in off. Each button press advances the viewing window to the next set of items.

Gauges

AWD Gauge

The AWD gauge displays the level of power applied to each wheel independently. The AWD system is almost always active and is transferring torque whenever the vehicle is accelerating, boosting output when wheels are slipping and shutting off on the highway to conserve fuel. The IPC receives the AWD wheel lock display message from the GWM over the HS-CAN3. The GWM receives the AWD wheel lock display message from the AWD module over the HS-CAN1

As power is applied to the wheels, the area directly in front (front wheels) or rear (rear wheels) of each displayed wheel begins to fill in. The lowest power displayed is the closest to the wheel. As the amount of power sent to the wheels increases, the area fills in either forward (front wheels) or rearward (rear wheels) of the wheels.

Fuel Gauge

The IPC sends a reference voltage to the fuel level sender. As the fuel level changes, a float actuates the variable resistor fuel level sender, raising or lowering the fuel level signal voltage. The IPC monitors the changes in voltage from the fuel level sender and sends a fuel level data message to the PCM through the GWM to calculate the fuel level.

The PCM calculates the fuel level based on current fuel in the fuel tank and the tank size. The PCM sends the fuel level display message to the IPC through the GWM to activate the needle in the fuel gauge.

After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) can range from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.

The IPC uses 4 different operating modes to calculate the fuel level:

• Anti-slosh (default mode).
• Key OFF fueling.
• Key ON fueling.
• Recovery.

The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sensor readings caused by fuel moving around in the tank), the fuel gauge takes approximately 40 minutes to go from empty (E) to full (F).

The key off fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions to be met:

• The ignition must be in the OFF mode when refueling the vehicle.
• At least 10% of the vehicle's fuel capacity must be added to the fuel tank.
• The IPC must receive a valid ignition ON fuel sensor reading within one second of the ignition being put into the RUN mode. The key ON sample readings are considered valid if the fuel sensor reading is between 10 ohms ± 2 ohms and 180 ohms ± 4 ohms.

If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.

The key ON fueling mode (approximately 60 seconds to read empty [E] to full [F]) requires the following conditions be met:

• The transmission is in P or N.
• The ignition is in the RUN mode.
• At least 10% of the vehicle's fuel capacity must be added to the fuel tank.

In key ON fueling mode, a 30-second timer activates after the transmission is put into the P or N position. When the 30-second time has elapsed and at least 9% of the vehicle's fuel capacity has been added, the fuel gauge response time is 60 seconds to read from empty (E) to full (F). When the transmission is shifted out of P or N, the fuel gauge strategy reverts to the anti-slosh mode. The key ON fueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the ignition in the RUN mode.

Speedometer

The IPC receives the vehicle speed data from the GWM over the HS-CAN3. The GWM receives the vehicle speed message from the PCM over the HS-CAN1.

The PCM uses tire size stored in the vehicle configuration file along with wheel speed inputs to generate a vehicle speed signal. The PCM receives the wheel speed data from the ABS module.

The IPC provides a tolerance that allows the speed indication to display between 3% below and 7% above the actual vehicle speed. This means that with an actual vehicle speed of 97 km/h (60 mph), the speedometer can indicate between 94-103 km/h (58-64 mph). Incorrect tire size or tire size configuration could potentially affect the speedometer accuracy.

Tachometer

The IPC receives the engine rpm data message from the GWM over the HS-CAN3. The GWM receives the engine rpm data message from the PCM over the HS-CAN1.

Temperature Gauge

The IPC uses 2 messages to control the temperature gauge. The first is the engine coolant temperature data, which provides the current coolant temperature input to the PCM. The second message is the engine overheat indication request, which is sent by the PCM to the IPC when an overheating condition exists. When the IPC receives the engine overheat indication request message, the IPC sends the temperature gauge to full hot and turns on the over-temperature warning indicator.

The IPC receives both temperature gauge input messages from the GWM over the HS-CAN3. The GWM receives the engine coolant temperature data and the engine overheat indication request messages from the PCM over the HS-CAN1.

Hybrid Only Gauge

High Voltage Battery Gauge (PHEV, Except China)

The high voltage battery gauge displays the total percentage of battery charge available associated with electric only driving range. A full fill display indicates the total amount of energy obtained from an external charging source (vehicle plugged in). When the fill display indicates empty, the powertrain system will automatically switch to operating in hybrid mode.

The IPC receives the battery state of charge data message from the GWM over the HS-CAN3. The GWM receives the battery state of charge data message from the BECM over the HS-CAN1.

RTT Indicators

ABS Warning

The IPC receives the ABS warning indicator request message from the GWM over the HS-CAN3. The GWM receives the ABS warning indicator request message from the ABS module over the HS-CAN2. If a fault condition exists in the ABS, the ABS module sends the ABS warning indicator request message to either flash or illuminate the ABS RTT warning indicator.

Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the ABS warning indicator is turned on.

ABS/Brake/Stability-Traction Control System Indication

The brake/stability-traction control system indication is controlled almost entirely by the ABS module. The ABS module can illuminate multiple indicators for various fault conditions. The following table provides a summary of the basic fault conditions and the indicators that are illuminated for each condition.

NOTE: Refer to the Normal Operation and Fault Condition description before each brake/stability-traction control system indicator Pinpoint Test for the IPC default action for network/missing message conditions.

Adaptive Cruise Control

The IPC provides a cruise control RTT indicator that appears as an image depicting a vehicle on the road with lines indicating the selected following distance to the vehicle in front. The IPC receives the adaptive cruise control follow mode display and adaptive cruise control gap display messages from the GWM over the HS-CAN3. The GWM receives the adaptive cruise control follow mode display and adaptive cruise control gap display messages from the IPMA over the HS-CAN2.

Airbag Warning

The IPC receives the airbag warning indicator request from the GWM over the HS-CAN3. The GWM receives the airbag indicator request from the RCM over the HS-CAN2. If a SRS concern is detected, the RCM sets a DTC and the IPC illuminates the airbag RTT warning indicator.

Auto High Beam

The IPC provides the auto high beam RTT indicator to indicate the auto high beam is active. The IPC receives the auto high beam indication request message from the GWM over the HS-CAN3. The GWM receives the auto high beam indication request message from the IPMA over the HS-CAN2.

Auto Hold

The IPC provides the auto hold RTT indicator to indicate the state of the auto hold feature. The auto hold feature holds a vehicle stationary once it has come to a stop using the brakes, allowing the driver to remove his or her foot from the brake pedal. The IPC receives the auto hold mode indicator request message from the GWM over the HS-CAN3. The GWM receives the auto hold mode indicator request message from the ABS module over the HS-CAN2.

Auto Stop-Start

The IPC provides the auto stop-start RTT indicator, along with multiple messages displayed throughout the auto stop-start system operation, to inform the driver of the system status and to provide direction when driver intervention is required. The IPC receives the stop-start standby indicator request from the GWM over the HS-CAN3. The GWM receives the stop-start standby indicator request from the PCM over the HS-CAN1.

The auto stop-start indicator informs the driver of the following states:

Blind Spot Monitoring System (BLIS®) Off

The IPC provides a BLIS off RTT indicator to inform the driver the BLIS is turned off. The IPC receives the cross traffic alert left status, cross traffic alert right status, side obstacle detect status-left and side obstacle detect status-right messages from the GWM over the HS-CAN3. The GWM receives the cross traffic alert left status and side obstacle detect status-left status from the SODL, and the cross traffic alert right status and side obstacle detect status-right messages from the SODR over the MS-CAN.

Brake Warning

The brake warning indicator or RTT indicator informs the driver the brake fluid level is low, there is a failure in the base brake system or the parking brake is applied. The IPC uses messaged inputs to control the brake RTT warning indicator.

• Brake lamp request
• Brake (red) warning indicator request

The IPC receives the brake lamp request, brake (red) warning indicator request and the brake warning indicator request messages from the GWM over the HS-CAN3.

The GWM receives the brake lamp request and brake (red) warning indicator request from the ABS module over the HS-CAN2.

Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the brake warning indicator is turned on.

Charge Warning (12-Volt Battery)

The IPC provides a charging system RTT indicator along with message displays indicating the charging system status. When a fault is present in the charging system, the BCM sends the battery low state of charge message to display message center warning messages and the charging system indicator. The IPC receives the battery low state of charge message from the GWM over the HS-CAN3. The GWM receives the battery low state of charge message from the BCM over the HS-CAN1.

The IPC provides a charging system RTT indicator along with message displays indicating the status of the charging system. When a fault is present in the charging system, the BCM sends the battery low state of charge message to display message center warning messages and the charging system RTT indicator.

Cruise Control

The IPC uses the following messaged inputs to control the cruise control RTT indicator and set speed display:

• Cruise control status
• Cruise control set speed display
• Cruise control override

The IPC receives the cruise control messages from the GWM over the HS-CAN3. The GWM receives the cruise control messages from the PCM over the HS-CAN1.

Distance Alert

The IPC provides a graphical display in the message center of the time gap to the vehicle traveling in the same direction, when the cruise control or adaptive cruise control is switched off. The IPC receives the forward distance alert warning indicator request message from the GWM over the HS-CAN3. The GWM receives the forward distance alert warning indicator request message from the IPMA over the HS-CAN2.

Door, Liftgate, Hood Ajar

The IPC provides a door ajar RTT indicator along with message displays to indicate the status of the doors, liftgate and hood. The BCM monitors each of the ajar inputs (driver, passenger, left rear, right rear, liftgate and hood) and sends a door ajar status, liftgate ajar status or hood ajar status message to the GWM over the HS-CAN1. The IPC receives the door ajar, liftgate ajar or hood ajar status messages from the GWM over the HS-CAN3 to display the door ajar indicator or the specific door, liftgate or hood ajar RTT indicator and corresponding warning message.

Drive Mode - Normal, Conserve, Excite, Slippery, Deep Conditions, Deep Sand, Pure EV, Preserve EV)

The IPC provides a drive mode RTT indicator when a specific drive mode is selected. The indicator displays each drive mode in text form. The IPC receives the selectable drive mode status, selectable drive mode request and active drive mode status messages from the GWM over the HS-CAN3. The GWM receives the selectable drive mode status, selectable drive mode request and active drive mode status messages from the ABS module over the HS-CAN2.

Electric Park Brake

The electric park brake RTT indicator illuminates when a fault in the electric park brake system is detected. The IPC receives the parking brake (yellow) warning indicator request message from the GWM over the HS-CAN3. The GWM receives the parking brake (yellow) warning indicator request message from the ABS module over the HS-CAN2.

Engine Over-Temperature Warning

The IPC provides an RTT warning indicator to alert the driver the engine is over temperature. The IPC receives the engine overheat indication request and the engine coolant temperature data from the GWM over the HS-CAN3. The GWM receives the engine overheat indication request and the engine coolant temperature data message from the PCM over the HS-CAN1.

Fog Lamp - Front

The IPC provides a front fog lamp RTT indicator to indicate when the front fog lamps are on. The IPC receives the front fog lamp indicator request message from the GWM over the HS-CAN3. The GWM receives the front fog lamp indicator request message from BCM over HS-CAN1.

Fog Lamp - Rear (Except North America)

The IPC provides a rear fog lamp RTT indicator to indicate the rear fog lamp is on. The IPC receives the rear fog lamp indicator request from the GWM over the HS-CAN3. The GWM receives the rear fog lamp indicator request from the BCM over the HS-CAN1.

Forward Collision Warning

The IPC provides a forward collision warning system indicator and message center message to warn the driver the vehicle is rapidly approaching another vehicle, object or pedestrian and a collision event is possible. The IPC receives the forward collision warning indicator request from the GWM over the HS-CAN3. The GWM receives the forward collision warning indicator request from the IPMA over the HS-CAN2.

High Beam

The high beam RTT indicator informs the driver the high beams are on. The IPC receives the high beam status message from the GWM over the HS-CAN3. The GWM receives the high beam status message from the BCM module over the HS-CAN1.

Hazard (PHEV)

The IPC provides a hazard RTT indicator to inform the driver that a vehicle hazard may exist and a powertrain shutdown may be imminent or may have already occurred. The indicator appears in the form of a triangle or a vehicle with an exclamation point (China). The IPC receives the HEV battery warning indicator request and HEV transmission warning indicator request message from the GWM over the HS-CAN3. The GWM receives the HEV battery warning indicator request and HEV transmission warning indicator request message from the SOBDMC over the HS-CAN1.

HEV Motor Over-Temperature (China Only)

The IPC provides a RTT warning indicator to alert the driver the engine or hybrid motor is over temperature. The IPC receives the HEV motor over-temperature indicator request from the GWM over the HS-CAN3. The GWM receives the HEV motor over-temperature indicator request from the SOBDMC over the HS-CAN1.

Hill Descent Control

The IPC provides a hill descent control RTT indicator to indicate when the HDC is in ready mode, active control mode, or in an over-temperature mode with the system cooling. The IPC receives the hill descent control indicator request message from the GWM over the HS-CAN3. The GWM receives the hill descent control indicator request message from ABS module over HS-CAN2.

Lane Keeping Aid

The IPC provides the lane keeping aid on RTT indicator to indicate the lane keeping system has been turned on or is active, and a lane keep assist RTT indicator to indicate the vehicle is drifting outside the traffic lane. The IPC receives the lane keeping system active display and the lane keeping system status display messages from the GWM over the HS-CAN3. The GWM receives the lane keeping system active display and lane keeping system status display messages from the IPMA over the HS-CAN2.

LH/ RH Turn Signal/Hazard

When the multifunction switch is in the LH or RH turn position or if the hazard switch is on, the BCM sends the left turn lamp on request or the right turn lamp on request to the GWM over the HS-CAN1. The GWM sends the left turn lamp on request or the right turn lamp on request to the IPC over the HS-CAN3. Upon receipt of the applicable turn signal on/off message, the IPC flashes the turn signal indicator on and off.

Lights On

When the parking lamps are turned on, the BCM sends the park lamp status message to the GWM over the HS-CAN1. The IPC receives the park lamp status message from the GWM over the HS-CAN3 to illuminate the lights on RTT indicator.

LED Low Beam Malfunction

The LED low beam malfunction RTT indicator lluminates when the LED bulb in the headlamp is not functioning correctly. The IPC receives the headlamp low beam out message from the GWM over the HS-CAN3. The GWM receives the headlamp low beam out message from the BCM over the HS-CAN1.

Low Engine Oil Pressure Warning

The IPC uses the engine oil pressure warning indicator request and engine RPM data to control the low engine oil pressure RTT indicator. The engine oil pressure sensor is hardwired to the PCM. The PCM provides the engine oil pressure warning indicator status request and the engine RPM data to the GWM over the HS-CAN1. The GWM provides the engine oil pressure warning indicator status request and engine RPM data to the IPC over the HS-CAN3. The IPC requires engine RPM above 400 RPM before the message center displays the low engine oil pressure warning.

Low Fuel

To supplement the fuel gauge indication, the IPC provides the low fuel warning indicator or RTT indicator.

The IPC uses the low fuel warning indicator request message sent from the PCM through the GWM to control the low fuel indicator.

When the DTE is 120 km (75 miles) (for MyKey®) and 80 km (25 miles), 40 km (25 miles), 20 km (10 miles) and 0 km (0 miles) for all keys, the low fuel indicator illuminates.

Low Washer Fluid Level

The low washer fluid level switch is hardwired to the IPC through a single signal circuit and is grounded through a separate ground circuit. The IPC provides a reference voltage to the washer fluid level switch. When the washer fluid is low, the washer fluid level switch opens, pulling the reference voltage high. When the IPC detects the washer fluid input is an open circuit, it illuminates the low washer fluid level RTT indicator.

MIL

The IPC receives the MIL request from the GWM over the HS-CAN3. The GWM receives the MIL request from the PCM over the HS-CAN1.

Overspeed Warning (Gulf Cooperative Countries [GCC])

The IPC provides an overspeed warning RTT indicator when the vehicle speed has reached or exceeded the 120 km/h (75 mph) threshold. The IPC receives the vehicle speed message from the GWM over the HS-CAN3. The GWM receives the vehicle speed message from the PCM over the HS-CAN1.

Powertrain Malfunction (Wrench) Warning

The IPC provides a powertrain malfunction (wrench) RTT warning indicator to indicate transmission, Electronic Throttle Control (ETC), AWD, BCM and hybrid system (if equipped) concerns.

The IPC provides a powertrain malfunction (wrench) RTT warning indicator to indicate a:

• BCM concern.
• gearshift concern.
• powertrain concern (Electronic Throttle Control [ETC]).
• transmission concern.
• HEV system or high voltage battery charging concern.

The IPC receives all applicable messages from the GWM over the HS-CAN3.

The GWM receives the body service required message from the BCM over the HS-CAN1.

The GWM receives the engine service required and the transmission service required messages from the PCM over the HS-CAN1.

The GWM receives the GSM service required message from the GSM over the HS-CAN2.

The GWM receives the HEV service required from the SOBDMC and the battery charger service required ( PHEV) message from the BECM over the HS-CAN1.

PRND

The IPC uses the following messages to control the PRND indication:

• Battery shed level request
• Ignition status
• Transmission gear display
• Transmission gear display mode
• Transport mode
• Vehicle speed

The IPC receives all messaged inputs from the GWM over the HS-CAN3.

The GWM receives the transmission gear display, transmission gear display mode and vehicle speed messages from the PCM over the HS-CAN1.

The GWM receives the ignition status, transport mode and battery shed level request messages from the BCM over the HS-CAN1.

When the vehicle is in transport mode or during battery load shed operation, the PRND is not displayed upon entry or exit from the vehicle to prevent battery drain during longer periods of time when the vehicle is not in use, such as those experienced during vehicle transport.

Ready to Drive (PHEV)

The ready to drive RTT indicator informs the driver the vehicle is ready to be driven. Since the engine may turn on and off at different times during operation, the ready to drive indication helps eliminate the potential for the driver to interpret the engine turning off as a stall or other failure condition. The IPC receives the ready to drive indication request message from the GWM over the HS-CAN3. The GWM receives the ready to drive indication request message from the PCM over the HS-CAN1.

Rear Seatbelt Monitor

The IPC provides a rear seatbelt monitor RTT indicator to indicate a rear seatbelt is not fastened. The IPC receives the driver rear seatbelt buckle status, passenger rear seatbelt buckle status, rear center seatbelt buckle status, driver third row seatbelt buckle status and passenger third row seatbelt buckle status messages from the GWM over the HS-CAN3. The GWM receives the applicable status messages from the RCM over the HS-CAN2.

Seatbelt Warning

The RCM monitors the driver and passenger seatbelt positions through the seatbelt buckle switch. The RCM provides the driver seatbelt buckle status and passenger seatbelt buckle status messages to the GWM over the HS-CAN2. The GWM provides the driver seatbelt buckle status and passenger seatbelt buckle status messages to the IPC over the HS-CAN3 to either turn on or turn off the seatbelt warning RTT indicator.

Speed Limit Sign

The IPC provides a speed limit sign RTT indicator using sign recognition data from the IPMA. The IPC receives the traffic sign recognition status request from the GWM over the HS-CAN3. The GWM receives the traffic sign recognition status request from the IPMA over the HS-CAN2.

Stability-Traction Control (Sliding Car Icon)

The stability-traction control (sliding car icon) RTT indicator informs the driver of the current status of the stability and traction control systems. The stability-traction control indicator illuminates when a fault condition exists or when an active traction control or stability control event is occuring. The IPC receives the stability-traction control indicator request message from the GWM over the HS-CAN3. The GWM receives the stability-traction control indicator request message from the ABS over the HS-CAN2.

Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the stability-traction control indicator (sliding car icon) is turned on.

Traction Control Disabled (Sliding Car OFF Icon)

The stability-traction control is configured on/off from the console mounted switch. When the driver enables or disables the stability-traction control system, the ABS module sends the traction control off indicator request message to the GWM over the HS-CAN2. The GWM sends the traction control off indicator request message to the IPC over the HS-CAN3 to illuminate or turn off the stability-traction control disabled (sliding car OFF icon) RTT indicator based upon the system state.

Refer to ABS/Brake/Stability-Traction Control System Indication description for information on the conditions when the stability-traction control disabled indicator (sliding car OFF icon) is turned on.

When a MyKey® administrator has set the AdvanceTrac® feature to always on and a MyKey® programmed key is in use, the stability-traction control system cannot be disabled. The menu selection in the message center used to disable the stability-traction control system does not display when a MyKey® is in use, but remains active for the MyKey® administrator to select the AdvanceTrac® always on feature off. The stability-traction control indicator still functions normally to indicate a stability-traction control system fault and a stability-traction control active event.

TPMS Warning

The IPC receives the tire pressure warning indicator message from the GWM over the HS-CAN3. The GWM receives the tire pressure warning indicator message from the BCM over the HS-CAN1.

If the BCM determines the tire pressure has exceeded the low tire pressure limits, the tire pressure warning indicator request message is sent to the IPC to illuminate the TPMS RTT warning indicator.

If a TPMS monitor or sensor fault condition exists, the BCM sends the tire pressure warning indicator request message to the IPC to flash the TPMS RTT warning indicator. The IPC flashes the TPMS RTT warning indicator for 75 seconds then turns the indicator on solid.

Vehicle Plugged In (PHEV)

The IPC provides a vehicle plugged in RTT indicator that illuminates when the vehicle is plugged into a charging source. The IPC receives the check plug to start display request and charge cord connection status messages from the GWM over the HS-CAN3. The GWM receives the check plug to start display request and charge cord connection status messages from the PCM over the HS-CAN1.

Component Description

Brake Fluid Level Switch

The brake fluid level switch is mounted in the master cylinder reservoir and is hardwired to the ABS module through a single signal circuit and is grounded through a separate return circuit. The ABS module provides a reference voltage to the brake fluid level switch. When the brake fluid level is low the switch closes, pulling the reference voltage low. When the brake fluid level is high, the switch opens, sending the reference voltage high on the signal circuit to the ABS module.

Engine Oil Pressure Sensor

The engine oil pressure sensor is hardwired to the PCM through VREF, signal and return circuits. The PCM provides the sensor voltage supply on the VREF circuit and monitors the voltage changes through the signal and return circuits as the engine oil pressure changes.

Fuel Level Sender (Float and Card)

The fuel level sender is mounted to the fuel pump and sender unit. The fuel level sender is a dual sweep potentiometer style resistor connected to a float mechanism. Each sweep has multiple fingers that reduces intermittent loss of data. As the fuel level changes, the float rises or falls with the fuel level moving the sweep arm across the resistor wires. This movement either increases or decreases the resistance through the unit. The fuel level sensor resistance ranges from 180 ohms ± 4 ohms to 10 ohms ± 2 ohms. When the fuel level is low, the fuel level sensor resistance is high. When the fuel level is high, the fuel level sensor resistance is low.

The fuel pump and sender unit is hardwired to the IPC through separate signal and return circuits. The fuel level return circuits are grounded internally in the IPC. The IPC provides a reference voltage on the fuel level signal circuit. As the fuel level changes, the change in resistance raises or lowers the fuel level signal voltage depending on the resistance of the fuel level sender. The IPC converts the fuel level signals and sends them to the PCM through the GWM.

IPC

The IPC provides the driver with a system status and alerts the driver when certain conditions exist in the vehicle. The IPC receives the ignition status from the BCM through the GWM over the HS-CAN3.

The IPC requires PMI when it is replaced.

Low Washer Fluid Level Switch

The low washer fluid switch is hardwired to the IPC through a single signal wire and is grounded to a body ground through a separate circuit. The IPC provides a reference voltage to the low washer fluid level switch. When the washer fluid level is low, the float drops closing the switch and pulling the reference voltage low. When the washer fluid level is high, the float lifts opening the circuit to the IPC and sending the reference voltage high.

Seatbelt Buckle Sensor

The seatbelt buckles contain integrated sensors that are Hall-effect switches. The seatbelt buckle sensors are serviced as one component with the seatbelt buckle. The seatbelt buckles are hard-wired inputs to the RCM. The RCM sends the seatbelt buckle status messages to the IPC.

Steering Wheel Switch - Message Center

The IPC and message center functions are controlled with the upper RH steering wheel switch, through the IPC message center menu. The RH steering wheel switch connects to the SIMA ( LH steering wheel switch connector). The SIMA is connected to the SCCM through private CAN circuits. The SCCM receives the switch signals from the SIMA over the private CAN, then sends the switch signals to the IPC through the GWM over the HS-CAN3 to operate the message center.