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 MANUALSPONTIAC1998FIREBIRD V8-5.7L VIN GREPAIR AND DIAGNOSISBODY AND FRAMELOCKSKEYLESS ENTRYDESCRIPTION AND OPERATIONSYSTEM OPERATIONBODY CONTROL MODULE (BCM)
1998 Pontiac Firebird V8-5.7L VIN G
Body Control Module (BCM)
1998 Pontiac Firebird V8-5.7L VIN GSECTION Body Control Module (BCM)
The Body Control Module (BCM) is battery fed. The BCM is always monitoring the transmitter signal. When the BCM receives the correct transmitter signal the following actions occur:
1. A transistor driver energizes the correct lock control relay coil.
2. The transistor driver will arm the universal theft-deterrent, if equipped.
3. The doors lock.
The BCM also regulates which lock control relays will be energized in order to perform the following operations:
^ Unlock the doors
^ Release the rear compartment lift window panel
^ Disarm the universal theft-deterrent, if equipped For replacement of the BCM, refer to Body Control Module Replacement Service and Repair
1. A transistor driver energizes the correct lock control relay coil.
2. The transistor driver will arm the universal theft-deterrent, if equipped.
3. The doors lock.
The BCM also regulates which lock control relays will be energized in order to perform the following operations:
^ Unlock the doors
^ Release the rear compartment lift window panel
^ Disarm the universal theft-deterrent, if equipped For replacement of the BCM, refer to Body Control Module Replacement Service and Repair
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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.