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 Oldsmobile RegencyFACTORY OEM SERVICE PROCEDURE
Entering Diagnostic Mode
- Turn ignition switch to ON position. Depress and hold power door UNLOCK switch. Cycle headlights 6 times within 20 seconds of depressing UNLOCK switch. Release power door lock UNLOCK switch.
- MALL module will sound stored history codes by audible bongs. Number of bongs correspond to history code number. FASTEN BELTS indicator flashes with each bong. MALL module will cycle through history codes 3 times, pausing 2 seconds between cycles. If no history codes exist, MALL will immediately enter input/output mode. History codes may be erased by holding power door unlock switch for four seconds. See MALL HISTORY CODES table for identification and description. To exit diagnostic mode, turn ignition switch to OFF position or accelerate vehicle above 8 MPH.
MALL HISTORY CODES
| History Code | Affected Circuit |
|---|---|
| 1 | FASTEN BELTS indicator (SBTELL) |
| 2 | Battery Protection (PBATT) |
| 3 | Courtesy Lights (CTSY) |
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.
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