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Home >> Ford >> 2013 >> Edge SEL, 2.0L Eng VIN 9 >> Repair and Diagnosis >> External Pages >> Different car >> Section 243 (Cruise Control System) >> Diagnosis And Testing >> Cruise Control >> Pinpoint Tests >> Pinpoint Test A: The Cruise Control Is Inoperative >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2014 Lincoln MKX and 2014 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.

For all cruise control systems, the cruise control switches, which are integral to the message center switch, use the Steering Column Control Module (SCCM) run/start voltage and the SCCM  ground. The cruise control functionality is controlled through the cruise control switches, which are hardwired to the SCCM  through signal and return circuits.

There are 3 toggle momentary contact cruise control switches with each switch operating a specific function that uses different resistance values. The SCCM  sends out a reference voltage to the cruise control switches and monitors the voltage drop when a cruise control switch is pressed. The voltage drop varies depending upon the resistance of each switch, providing a specific indication to the SCCM  of which switch is pressed. The SCCM  sends a network message over the High Speed Controller Area Network (HS-CAN) to the PCM relaying the switch status and requesting cruise control operation.

The stoplamp switch is a single plunger 2-stage switch with 2 inputs to the PCM. When the brake pedal is applied, the first stage, which is a normally open stoplamp switch, closes and sends a voltage signal to the PCM deactivating the cruise control, if engaged. The second stage is the normally closed cruise control deactivator switch (integral to the stoplamp switch), which opens and removes the ground signal to the PCM when the brake pedal is firmly applied. This is a redundant signal to the PCM. There is less than one millimeter in plunger travel between the first and second stage.

On vehicles with the adaptive cruise control system, the Cruise-Control Module (C-CM) communicates with the Instrument Panel Cluster (IPC), Body Control Module (BCM), Head Up Display (HUD) module, Restraints Control Module (RCM), ABS module and PCM over the High Speed Controller Area Network (HS-CAN). Through the module network communication the C-CM  controls the adaptive cruise control system.

This pinpoint test is intended to diagnose the following: 

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