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  • P0381 Wait To Start Lamp Inoperative

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    Mopar1973Man

    P0381 WAIT TO START LAMP INOPERATIVE

    When Monitored and Set Condition:

    When Monitored: Ignition on.
    Set Condition: The cluster sends a signal to the ECM that it has detected a failed wait to start lamp.

    POSSIBLE CAUSES

    • WAIT-TO-START LAMP STAYS ON ALL THE TIME
    • WAIT-TO-START LAMP DRIVER CIRCUIT SHORTED TO GROUND
    • WAIT-TO-START LAMP DRIVER CIRCUIT OPEN FROM ECM TO CLUSTER.
    • FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN
    • WAIT-TO-START LIGHT BULB
    • ECM DRIVER CIRCUIT OPEN
    • WIRING/CONNECTOR PROBLEM
    • ECM

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition off. While watching the wait-to-start lamp, turn the ignition key on. Did the wait-to-start lamp light?
      Yes --> Go To 2
      No --> Go To 4
    2. Turn the ignition off. While watching the wait-to-start lamp, turn the ignition key on. Does the wait-to-start lamp stay on all the time?
      Yes --> Go To 3
      No --> Wait-to-start Lamp operating normally. Test passed. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    3. Turn the ignition off. Disconnect the ECM harness connector. Check connectors - Clean/repair as necessary. While watching the wait-to-start lamp, turn the ignition key on. Did the Wait-to-start lamp light?
      Yes --> Repair Diesel Wait-to-start Lamp driver circuit for a short to ground. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Test Complete.
    4. Turn the ignition off. Disconnect the ECM harness connector. Connect a jumper between the ECM Wait-to-start Lamp driver and a good ground. Did the Wait-to-lamp illuminate?
      Yes --> Go To 5
      No --> Repair the open Wait-to-start lamp driver circuit open from ECM to cluster. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    5. Turn the ignition off. Remove the cluster. Turn the ignition on. Using a 12-Volt test Light, check the Fused Ignition Switch Run/Start circuit. Is the light illuminated and bright?
      Yes --> Go To 6
      No --> Repair the open fused Ignition Switch Output circuit Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    6. Remove and inspect the Wait-to-Start Bulb. Is the Bulb Ok?
      Yes --> Go To 7
      No --> Replace the Wait-to-Start Bulb. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    7. Measure the Wait-to-start driver circuit at the ECM harness connector. Is the voltage above 10.0 volts?
      Yes --> Replace and program the ECM in accordance with the Service Information. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Go To 8
    8. Using a schematic as a guide, inspect the related wiring and connectors for problems. Check the Fuses. Were any problems found?
      Yes --> Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    9. Test Complete Repair as necessary. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).


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