Test B

Pinpoint Test B: The Adjustable Brake Pedal Does Not Operate Correctly

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Normal Operation
The adjustable pedal memory function utilizes a potentiometer located in the adjustable pedal motor. The DSM supplies a reference voltage on circuit 891(RD/BK) to the potentiometer and grounds the signal return on circuit 894 (GY) from the potentiometer. The signal voltage on circuit 1491 (LB/YE) from the adjustable pedal potentiometer to the DSM provides an indication to the DSM of whether or not the adjustable pedal motor is stalled. When the driver sets a pedal position in the DSM, it stores the value of where the adjustable pedal is located using a time frame of motor operation. When the driver requests a return to a pedal position in memory, the DSM will operate the adjustable pedal motor until the adjustable pedal potentiometer output matches the time frame stored in the memory.

Possible Causes
^ circuit 891(RD/BK) open or shorted to ground
^ circuit 894 (GY) open or shorted to ground
^ circuit 1491(LB/YE) open or shorted to ground
^ adjustable pedal potentiometer
^ DSM