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Home >> Cadillac >> 2008 >> STS V >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Interlock System >> Diagnostic Information and Procedures >> Transmission Control Lever Malfunction >> Circuit/System Testing
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Circuit/System Testing

  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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