C107C-Brake pedal switch 1/2 stuck

C107C Brake pedal switch 1/2 stuck - The brake (or stop) lamp switch controls three independent circuits. Three circuits are described as follows :

C107C-Brake pedal switch 1/2 stuck

  • Brake Lamp Switch Circuit : A normally open brake lamp switch circuit receives a battery voltage input, and supplies this battery voltage to the lamps and the Antilock Brake System (ABS) Module on a brake lamp switch output circuit only when the brake pedal is depressed (brake lamp switch plunger released).
  • Brake Lamp Switch Signal Circuit : A normally closed brake lamp switch signal circuit receives a direct path to ground, and supplies this ground input to the Powertraint Control Module (PCM) on a brake lamp switch sense circuit only when the brake pedal is released (brake lamp switch plunger is depressed).
  • Speed Control Circuit : A normally closed speed control circuit receives a battery voltage input from the PCM on an ignition run/start control output circuit, and supplies this battery voltage to the PCM on a brake signal 2 circuit only when the brake pedal is released (brake lamp switch plunger is depressed).
The PCM sends electronic Brake Lamp Switch Status messages to other electronic modules in the vehicle over the Controller Area Network (CAN) data bus for use as an additional logic input for controlling many other vehicle functions and features.

The brake lamp switch as well as the hard wired inputs and outputs of the switch may be diagnosed using conventional diagnostic tool and procedures. However, conventional diagnostic methods will not prove conclusive in the diagnosis of the electronic controls and communication that provide some features related to brake lamp switch operation. The most reliable, efficient and accurate means to diagnose the electronic controls and communication related to brake lamp switch operation requires the use of a diagnostic scan tool.

Powertraint Control Module (PCM) DTC present.

With the scan tool, read PCM brake DTC.

Are there any PCM brake DTC present ?

Yes, perform the appropriate diagnostic (Sitemap-DTC P code (PCM).
No, using the schematics as a guide, check the PCM terminals for corrosion, damage, or terminal push out. Pay particular attention to all power and ground circuits. Perform the ABS Verification Test.

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