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.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 429 (REMOTE KEYLESS ENTRY SYSTEM)DESCRIPTION AND OPERATIONKEYLESS ENTRY SYSTEM DESCRIPTION AND OPERATIONUNLOCK ALL DOORS (SECOND OPERATION)
1999 GMC Forward Control 5.7 R, Automatic
Unlock All Doors (Second Operation)
1999 GMC Forward Control 5.7 R, AutomaticSECTION Unlock All Doors (Second Operation)
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
Momentarily press the UNLOCK button a second time (within 2 seconds of the first press) in order to perform the following functions:
- Unlock the remaining doors.
- Illuminate the interior lamps for approximately 40 seconds or until the ignition is turned ON.
- Flash the exterior lights (if selected ON in personalization).
- Chirp the horn (if selected ON in personalization).
- Recall the memory seat and the memory mirror positions for that driver.
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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.