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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Steering Wheel & Steering Column) >> Diagnostic Information and Procedures >> Heated Steering Wheel Inoperative >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the heated steering wheel control module.
  2. Ignition OFF, test for less than 1.0 ohm between the ground circuit terminal B and ground.
    • If greater than the specified value, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates between the ignition circuit terminal A and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
  4. Install a 3A fused jumper wire between the control circuit terminal 2 and B+. Verify the heated steering wheel indicator is illuminated.
    • If the indicator does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the left steering wheel control switch.
  5. Install a test lamp between the supply voltage circuit terminal B and B+.
  6. Cycle the heated steering wheel switch. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the supply voltage circuit for a short to ground. If the circuit tests normal, test or replace the left steering wheel control switch.
    • If the test lamp is always OFF, test the supply voltage circuit for a short to voltage or and open/high resistance. If the circuit tests normal, test or replace the left steering wheel control switch.
  7. If all circuits test normal, replace the heated steering wheel control module.
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