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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 228 (Shift Interlock System) >> Diagnostic Information and Procedures >> Transmission Control Lever Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
  2. Ignition ON, test between the Ignition voltage circuit terminal E and ground.
    • If the test lamp did not illuminate, test the Ignition voltage circuit for a short to ground or an open/high resistance.
  3. Install a test lamp between circuit terminal E and the control circuit terminal K.
  4. Ignition ON, depress and release the brake pedal several times. The test lamp should turn ON and OFF as commanded.
    • If the test lamp is always ON, test the control circuit for short to ground. If the circuit tests normal, replace the RCDLR.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance.If the circuit test normal, replace the RCDLR.
  5. If the circuit tests normal, replace the shift lock control solenoid.
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