Normal Operation
WARNING: This page is about a different car, the 2008 Mercury Sable, 2008 Ford Taurus X, and 2008 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
The speed control deactivator switch interrupts the power signal to the PCM through circuit CES09 (VT/OG) when the brake pedal is applied firmly and passes the speed control deactivator switch trip point. This is a redundant signal to the PCM.
- DTC P1703 (Brake On/Off Circuit Failure) - 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:
- Fuse
- Stoplamps system concern
- Wiring, terminals or connectors
- Speed control deactivator switch
- PCM