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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 11 (Steering Wheel & Steering Column) >> Diagnostic Information and Procedures >> Heated Steering Wheel Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the heated steering wheel control module.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the ground circuit terminal D 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 greater than 1.0 ohm, repair the open or high resistance in the ground circuit.
  4. Install a 3A fused jumper wire between the control circuit terminal C 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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