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 Seville SLSFACTORY OEM SERVICE PROCEDURE
Door Control System Check
- Turn ignition switch to OFF position. Install scan tool. Turn ignition to ON position. Attempt to establish communication with Left Front Door Module (LFDM). If scan tool communicates with LFDM, go to step 3). If scan tool does not communicate with LFDM, go to next step.
- Attempt to establish communications with other modules connected to same serial data line (PCM, ABS, IPC, etc.). If scan tool communicates with other modules, see appropriate loss of communication DTC in BODY CONTROL MODULE article for diagnosis. If scan tool does not communicate with other modules, see appropriate DATA LINK CONNECTORS article in WIRING DIAGRAMS.
- Using scan tool, select DISPLAY LFDM DTC function. If any current DTCs are stored, go to next step. If no DTCs are stored, go to step 5).
- If U1016, U1064, U1065, U1066, U1255, U1300 and/or U1301 Diagnostic Trouble Codes (DTCs) are set, refer to appropriate loss of communication DTC in BODY CONTROL MODULE article for diagnosis. If above DTCs are not set, see DTC DEFINITIONS for DTC set.
- If customer complaint is with power mirrors, see POWER MIRRORS article. If customer complaint is with power door locks, see appropriate POWER DOOR LOCKS article. If customer complaint is neither with power mirrors or power door locks, go to POWER WINDOWS SYSTEM CHECK .
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.