Test C: The Speed Control Does Not Disengage When The Brakes Are Applied

PINPOINT TEST C: THE SPEED CONTROL DOES NOT DISENGAGE WHEN THE BRAKES ARE APPLIED

NOTE: Tapping the brake pedal deactivates the speed control. It is necessary to apply the brakes in order to slow the vehicle down.

Normal Operation
The speed control actuator sends a voltage reference signal through circuit CCB08 (VT/WH). The stoplamps provide a ground path that enables speed control operation. When the brake pedal is applied, the voltage goes high and speed control goes into stand-by mode.

Voltage for the speed control servo clutch (internal to the speed control actuator) is supplied by the smart junction box (SJB) to the speed control deactivator switch through circuit CBP34 (VT/BN). The speed control deactivator switch (closed when the brake pedal is not applied) then routes the voltage to circuit CES09 (VT/OG) to the speed control actuator. When the brake pedal is firmly pressed, the speed control deactivator switch opens and voltage is no longer supplied to the speed control servo clutch.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Obstructions to the accelerator pedal or linkage
- Speed control deactivator switch
- Stoplamp switch
- Speed control cable
- Accelerator cable
- Speed control actuator

C1:

C2-C5: