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Home >> Mercury >> 2009 >> Sable Premier, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1406 (Cruise Control System - Speed Control) >> Diagnostic Tests >> Speed Control >> Pinpoint Tests >> Pinpoint Test B: DTC P1572 or P1703 - Brake On/Off Circuit Failure >> Normal Operation
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Normal Operation

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. 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 636 (OG) when the brake pedal is applied firmly. This is a redundant signal to the PCM.

DTC P1572 (Brake On/Off Circuit Failure) - sets when the PCM does not sense the proper sequence of the brake pedal input signal from both the stoplamp and deactivator switches when the brake pedal is pressed and released.

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:

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