Pinpoint Test 1: The Speed Control Is Inoperative
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PINPOINT TEST 1: THE SPEED CONTROL IS INOPERATIVE - HYBRID
Normal Operation
A reference voltage is sent from the PCM to the steering wheel speed control switches. When a switch is pressed, the voltage is routed through a specific resistor value for each function. The PCM provides the ground for the reference voltage to determine which control input function has been selected. When the brake pedal is applied the PCM deactivates the speed control if engaged.
The speed control deactivator switch (part of the stoplamp switch) interrupts circuit (V/O) removing the voltage signal to the PCM when the brake pedal is applied. This is a redundant signal to the PCM.The ABS module monitors brake pressure and also receives the stoplamp switch input from the Smart Junction Box (SJB) along the High Speed Control Area Network (HS-CAN) bus. A fault in the ABS module can disable the speed control system.
Possible Causes
- Wiring, terminals or connectors
- PCM not configured for speed control
- Stoplamp switch
- Speed control switch
- Digital transmission range (TR) sensor
- Vehicle speed signal
- PCM
- ABS module
- Park brake
Diagnostic Procedure
CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
