Test B: The Speed Control Is Inoperative

PINPOINT TEST B: THE SPEED CONTROL IS INOPERATIVE

B1-B5:

B5-B8:

B9:

Normal Operation
The PCM sends a signal through circuit VES10 (WH) to the speed control switches, which passes through the clockspring. The return signal is sent through circuit RES08 (GN/BN) and the clockspring. A varying voltage is created as different speed control command switches are pressed. The stoplamp switch sends a voltage signal through circuit CCB08 (VT/WH) to the PCM when the brake pedal is applied, and deactivates the speed control if engaged.

Vehicles equipped with a manual transmission have an additional clutch pedal position (CPP) switch. The CPP switch, normally closed, supplies a voltage signal to the PCM through circuit CE904 (GN/VT). When the clutch pedal is applied, the CPP switch moves to the open position causing the PCM to lose the voltage signal and deactivate the speed control.

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 stoplamp switch trip point. This is a redundant signal to the PCM.

This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- Speed control switch
- CPP switch
- PCM