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.
1998 Cadillac Eldorado BaseFACTORY OEM SERVICE PROCEDURE
Memory Function Switch Inoperative
- Perform MEMORY SYSTEM CHECK under TESTING - SYSTEM CHECKS. Go to next step.
- Using test light, backprobe between Memory Mirror Module (MMM) connector C1, terminal E1 (Orange wire) and memory function switch connector terminal "E" (Black wire). If test light illuminates, go to next step. If test light does not illuminate, go to step 6).
- Using test light, backprobe between MMM connector C1, terminal E1 (Orange wire) and appropriate memory function connector switch terminal. See WIRING DIAGRAMS . Operate suspect memory switch. If test light illuminates, go to next step. If test light does not illuminate, go to step 7).
- Using test light, backprobe between MMM connector C1, terminal E1 (Orange wire) and appropriate MMM connector terminal. See WIRING DIAGRAMS . Operate suspect memory switch. If test light illuminates, go to next step. If test light does not illuminate, go to step 8).
- Replace Memory Mirror Module (MMM).
- Check for open in Black wire between memory function switch and ground. If circuit is okay, go to next step. If circuit is not okay, go to step 9).
- Replace memory function switch.
- Repair problem in appropriate wire. See WIRING DIAGRAMS .
- Repair open in Black wire between memory function switch and ground. See WIRING DIAGRAMS .
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.