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 MANUALSPONTIAC1991FIREBIRD V8-350 5.7LREPAIR AND DIAGNOSISACCESSORIES AND OPTIONAL EQUIPMENTANTITHEFT AND ALARM SYSTEMSSERVICE AND REPAIRPROGRAMMING A NEW DECODER MODULE
1991 Pontiac Firebird V8-350 5.7L
Programming A New Decoder Module
1991 Pontiac Firebird V8-350 5.7LSECTION Programming A New Decoder Module
New decoder modules are unprogrammed. Before the system will function properly after a new module has been installed, it must be programmed to the code that matches the customers keys.
1. Install the new, unprogrammed decoder module.
2. Insert one of the customers keys in the ignition lock cylinder and turn it to the "ON" position. Start the engine at this time to verify system operation.
3. Observe the security indicator lamp. The indicator should come on and stay on continuously until the next ignition cycle. If the lamp does not go out when the ignition is cycled off and then on again, repeat step 2 thru 3. If vehicle still will not start, refer to diagnostic procedures.
1. Install the new, unprogrammed decoder module.
2. Insert one of the customers keys in the ignition lock cylinder and turn it to the "ON" position. Start the engine at this time to verify system operation.
3. Observe the security indicator lamp. The indicator should come on and stay on continuously until the next ignition cycle. If the lamp does not go out when the ignition is cycled off and then on again, repeat step 2 thru 3. If vehicle still will not start, refer to diagnostic procedures.
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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.