Lincoln Aviator 2020-2022 Service Manual / Electrical / Electronic Feature Group / Cruise Control / Description and Operation - Cruise Control - System Operation and Component Description

Lincoln Aviator: Cruise Control / Description and Operation - Cruise Control - System Operation and Component Description

System Operation

Non-Adaptive Cruise Control


Item Description
1 Brake switch assembly
2 IPC
3 Accelerator pedal
4 Deactivator switch
5 Stoplamp switch
6 SCCM
7 PCM
8 Cruise control switches
9 GWM
10 ABS module
11 RCM
12 Steering Effort Control Module (SECM) (adaptive steering)
13 SASM (adaptive steering)
14 SIMA

Network Message Chart

  Network Input Messages - IPC


Broadcast Message Originating Module Message Purpose
Cruise control override   PCM Driver overriding cruise control with accelerator pedal.
Cruise control status   PCM Data used for speed control indicator status.
Cruise control set speed   PCM Data used to display the driver selected vehicle speed

  Network Input Messages - PCM


Broadcast Message Originating Module Message Purpose
Cruise control switch commands   SIMA Used for cruise control enable/disable and operating mode request.
Stability control event in progress ABS module Deactivates speed control when requested.
Traction control event in progress
Vehicle lateral acceleration   RCM Deactivates speed control when requested.
Vehicle longitudinal acceleration
Vehicle yaw rate

  Network Input Messages - SIMA


Broadcast Message Originating Module Message Purpose
Cruise control switch commands   SIMA Used for cruise control switch enable/disable and operating mode commands.

Cruise Control Operation

The cruise control functions include:

  • turning on the cruise control system.
  • setting and maintaining the desired vehicle speed.
  • accelerating the vehicle speed.
  • coasting down to a lower speed.
  • resuming the prior speed.
  • turning off the cruise control system.

The cruise control system maintains a selected vehicle speed within a range between 32 km/h (20 mph) or 30 km/h (18 mph) if equipped with a metric cluster and the maximum limited vehicle speed. When a MyKey® restricted key is in use, the vehicle speed will not exceed the MyKey® maximum limited speed. During normal driving conditions, the vehicle speed can fluctuate slightly from the selected set speed due to road conditions. The vehicle speed can fluctuate more noticeably when driving up and down steep hills.

Certain conditions cause the cruise control system to deactivate:

  • Application of the EPB.
  • Transmission gear selector is placed into a position other than Drive.
  • Cruise control set speed is overridden with the accelerator pedal for a period longer than 5 minutes.
  • Cruise control switch is pressed or stuck longer than 2 minutes.
  • Vehicle speed decreases more than 16 km/h (10 mph) below the set speed.
  • ABS fault.

The stoplamp switch assembly contains the stoplamp switch along with the cruise control deactivator switch. The APP sensor and stoplamp switch are hardwired inputs to the PCM.

The vehicle speed is controlled by the PCM.

The cruise control system provides self-diagnostics. Cruise control is disabled anytime an error is detected in the system. No IPC indicator or message center messages are displayed when faults occur. Cruise control switch fault codes are logged by the SIMA.

Cruise Control Indicator

The cruise control indicator, located in the IPC message center, illuminates to indicate the cruise control system is active.

Steering Wheel Switch Function

Cruise control switch inputs are received by the SIMA and sent through the SASM (vehicles with adaptive front steering) or the SCCM (vehicles without adaptive front steering) on the HS-CAN2 and then to the PCM on the HS-CAN2.

The cruise control switches are located at the lower left and lower right of the steering wheel. Cruise ON/OFF along with SET+/SET- are located on the lower left. CANCEL and RESUME are located on the lower right. All cruise control switch inputs are hardwired to the SIMA. The SIMA is located at the upper left steering wheel switch.

Pressing and releasing the steering wheel cruise control ON switch turns the cruise control system on and the cruise control icon illuminates in the message center. Pressing and releasing the steering wheel cruise control OFF switch turns the cruise control system off. Pressing SET+ or SET- on the SET switch while the vehicle is traveling at the desired speed activates the cruise control system.

Pressing up or down on the SET switch while in the active mode increases or decreases the maintained vehicle speed by 1 km/h per press when displayed units are km/h and 1 mph per press when displayed units are mph. If the respective switch is pressed and held, the vehicle speed continues to accelerate or decelerate until the switch is released.

Pressing and releasing the ON/OFF switch or turning the ignition switch to the off position, turns the cruise control system off. While the cruise control system is active, applying the brake pedal or pressing the CANCEL switch puts the cruise control system into standby mode. Pressing the RESUME switch when the cruise control system is in standby mode causes the vehicle to accelerate to the last speed. Resume does not function if the off switch is pressed, the ignition switch is cycled off or if the current vehicle speed is below the minimum operational speed.

Steering Wheel Switches

The cruise control steering wheel mounted switches are momentary contact switches that toggle up and down for the switch state. On vehicles without adaptive steering, the switches are an input to the SIMA then to the SCCM. On vehicles with adaptive steering, the switches are an input to the SIMA then to the SASM. The SECM acts as a pass through that sends switch data to the SASM (part of the clockspring assembly).

Brake Switch

When the brake pedal is applied, the cruise control deactivator switch, integrated in the stoplamp switch, opens and removes the ground signal from the PCM input circuit releasing the throttle, immediately deactivating the cruise control system.

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