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  • P0596 High Voltage Detected At The S/C Brake Switch Output

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    P0596 HIGH VOLTAGE DETECTED AT THE S/C BRAKE SWITCH OUTPUT

    When Monitored and Set Condition:

    When Monitored: While the key is on.
    Set Condition: The voltage detected on the Speed Control Servo is below a calibrated value for a calibrated
    amount on time.

    POSSIBLE CAUSES

    • SPEED CONTROL SERVO ASSEMBLY
    • (V32) S/C 12-VOLT SOURCE SHORTED TO OTHER CIRCUITS
    • (V32) S/C BRAKE SWITCH OUTPUT SHORTED TO GROUND
    • ECM
    • INTERMITTENT CONDITION

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition off. Disconnect the Speed control servo harness connector.
      NOTE: Check connectors - Clean/repair as necessary.
      Ignition on, engine not running. With the DRBIII®, actuate the S/C 12-volt source. Using a 12-volt test light connected to battery ground, check the S/C brake switch Output circuit in the Speed Control servo harness connector.
      NOTE: The test light must illuminate brightly.
      Compare the brightness to that of a direct connection to the battery. Does the test light cycle on and off and illuminate brightly?
      Yes --> Replace the speed control servo assembly.
      No --> Go To 2
    2. Turn the ignition off. Disconnect the ECM harness connector(s).
      NOTE: Check connectors - Clean/repair as necessary.
      Measure the resistance of the S/C brake switch output circuit between the Speed Control assembly connector and battery negative. Is the resistance greater than 100k Ohms?
      Yes --> Go To 3
      No --> Repair the (V32) S/C brake switch output shorted to ground.
    3. Measure the resistance between the S/C 12-volt source circuit in the ECM harness connector and all other circuits in the ECM harness connectors. Is the resistance less than 100k Ohms?
      Yes --> Go To 4
      No --> Repair the (V32) S/C 12-volt source circuit shorted to other circuit.
    4. Turn the ignition off. Reconnect the ECM harness connectors. Ignition on, engine not running. With the DRBIII®, actuate the S/C 12-volt source. Using a 12-volt test light connected to battery ground, check the S/C brake switch Output circuit in the Speed Control servo harness connector.
      NOTE: The test light must illuminate brightly.
      Compare the brightness to that of a direct connection to the battery. Does the test light cycle on and off and illuminate brightly?
      Yes --> Test Complete.
      No --> Replace and program the ECM in accordance with the Service Information.

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