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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 136 (Wiring Systems And Power Management - DTC B1370 To DTC B1475) >> DTC B1433 >> Circuit/System Testing

Circuit/System Testing

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  1. With the ignition OFF, disconnect the R3 RUN relay and connect a test lamp between the run relay coil control circuit and battery positive voltage. The test lamp should not illuminate
    • If the test lamp illuminates, test for a short to ground on the run relay coil control circuit. If the circuit tests normal and the DTC is current, replace the BCM.
  2. If the circuit tests normal and the DTC is current, test or replace the R3 RUN relay or BCM.
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