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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Accessories & Equipment >> Wiper/Washer Systems >> Wipers And Washers >> Diagnostic Information and Procedures >> DTC B3875 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the underhood fuse block.
    2. IMPORTANT: The underhood fuse block bottom view illustration is an inverted view of the connectors in the bracket assembly.
  2. Connect a 60A fused jumper from the battery supply terminal in connector X6 to connector X5 terminal F2.
  3. Connect a test lamp from battery voltage to the WIPER 2 relay control circuit in connector X5 terminal K1.
  4. Command the Wiper High Speed Relay ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the body control module.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the body control module.
  5. If all circuits test normal, replace the underhood fuse block.
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