Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2011 Cadillac STS AWDFACTORY OEM SERVICE PROCEDURE
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the shift lock control solenoid.
- 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.
- Connect a test lamp between the B+ circuit terminal E and control circuit terminal K.
- 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.
- If all circuits test normal, test or replace the shift lock control solenoid.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.