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Home >> Cadillac >> 2011 >> STS AWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Shift Lock Control 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, verify a test lamp illuminates between the B+ circuit terminal E and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or open/high resistance. If the circuit tests normal, test or replace the shift lock control solenoid.
  3. Connect a test lamp between the B+ circuit terminal E and control circuit terminal K.
  4. 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 or short to voltage. If the circuit test normal, replace the RCDLR.
  5. If all circuits test normal, test or replace the shift lock control solenoid.
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