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.
1997 Cadillac CateraFACTORY OEM SERVICE PROCEDURE
BCM System Check
- Connect scan tool. Attempt to establish communication with BCM. If scan tool displays data, go to next step. If scan tool does not display data, go to step 4).
- If no current DTCs are displayed, go to next step. If current DTCs are displayed, go to BCM DTC DEFINITION .
- If no history DTCs are displayed, go to next step. If history DTCs are displayed, go to step 7).
- Using scan tool, attempt to establish communication with radio receiver. If communication can be established, go to next step. If communication cannot be established, go to BCM COMMUNICATION PROBLEMS under BCM DTC DEFINITION .
- Using scan tool, attempt to establish communication with Remote Control Door Lock Receiver (RCDLR). If communication can be established, go to next step. If communication cannot be established, go to BCM COMMUNICATION PROBLEMS under BCM DTC DEFINITION .
- Using scan tool, select DIAGNOSTIC CIRCUIT CHECK. Select CLASS 2 MESSAGE MONITOR. Using key fob, lock all doors. If scan tool displays status of all modules as ACTIVE, system is operating properly. If scan tool does not display status of all modules as ACTIVE, go to BCM COMMUNICATION PROBLEMS under BCM DTC DEFINITION .
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.