Normal Operation
WARNING: This page is about a different car, the 2010 Lincoln MKX and 2010 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is applied, the stoplamp switch closes and sends voltage to the PCM to deactivate the cruise control, if engaged.
The cruise control deactivator switch (part of the stoplamp switch) removes the voltage signal to the PCM when the brake pedal is applied firmly and passes the cruise control deactivator switch point. This is a redundant signal to the PCM.
The ABS module monitors brake pressure and also receives the stoplamp switch input from the PCM along the High Speed Controller Area Network (HS-CAN) bus. A fault in the ABS module can disable the cruise control system.
- DTC P1572 (Brake Pedal Switch Circuit) - sets when the PCM does not sense the correct sequence of the brake pedal input signal from both the cruise control deactivator and stoplamp switches when the brake pedal is pressed and released.
- DTC P1703 (Brake Switch Out of Self-Test Range) - sets when there is an open or short in the deactivator switch circuits or when there is an open or short in the stoplamp circuits.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Cruise control deactivator switch (integral to the stoplamp switch)
- ABS module
- PCM