Normal Operation
WARNING: This page is about a different car, the 2011 Lincoln MKT. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is applied, the normally open stoplamp switch closes and sends a voltage signal to the PCM disengaging the cruise control.
The normally closed cruise control deactivator switch (part of the stoplamp switch), opens and removes the voltage signal to the PCM when the brake pedal is applied firmly. This is a redundant cruise control deactivation signal to the PCM.
- 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
- Stoplamps system concern
- Cruise control deactivator switch (integral to the stoplamp switch)
- ABS module
- PCM