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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 Indicator Malfunction >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disable the SIR system and remove the inflatable restraint module from the steering wheel.
  2. Remove and disconnect the heat control module, located at the top of the steering wheel.
  3. Ignition ON, measure resistance between ground circuit terminal B and ground.
    • If greater than 1.0 ohm, repair the open or high resistance in the ground circuit.
  4. Test for battery voltage on the ignition 1 voltage circuit terminal A of the heat control module connector.
    • If battery voltage is not present, test for and repair the open in the ignition 1 voltage circuit.
  5. Measure voltage between the ignition voltage circuit terminal A and the switch circuit terminal B. Press and release the heated steering wheel switch. Verify that there is battery voltage between terminals A and B when the switch is pressed, and no voltage when the switch is released.
    • If there is no voltage when the switch is pressed, test the switch circuit for an open. If the circuit tests normal, test or replace the switch.
  6. Connect a 3A fused jumper between the indicator control circuit terminal 2 and the ignition voltage circuit terminal A. Verify that the heated wheel indicator illuminates when terminals 2 and A are jumpered together.
    • If the indicator does not illuminate when terminals 2 and A are jumpered, test the indicator control circuit for an open, short to ground, or high resistance. If the circuit tests normal, test or replace the switch.
  7. If all circuits test normal, replace the steering wheel heat control module.
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