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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 454 (Steering Wheel And Steering Column) >> Diagnostic Information and Procedures >> DTC B2850, B2855, B2870, or B2875 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the tilt switch.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal B and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  3. Verify the scan tool tilt switch parameter is Inactive.
    • If not the specified value, test the control circuit listed below for a short to voltage. If the circuit tests normal, replace the MSM.
    • Tilt Up Switch terminal C
    • Tilt Down Switch terminal A
  4. Install a 3A fused jumper wire between the control circuits listed below and the B+ circuit terminal. Verify the scan tool tilt switch parameter is Active.
    • Tilt Up Switch terminal C
    • Tilt Down Switch terminal A
    • If not the specified value, test the appropriate control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the MSM.
  5. If all circuit test normal, test or replace the tilt switch.
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