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 MANUALSCHEVROLET2005BLAZER 4WD V6-4.3L VIN XREPAIR AND DIAGNOSISTESTING AND INSPECTIONPROGRAMMING AND RELEARNINGBODY CONTROL MODULE (BCM) - PROGRAMMING & SETUP
2005 Chevrolet Blazer 4WD V6-4.3L VIN X
Body Control Module (BCM) - Programming & Setup
2005 Chevrolet Blazer 4WD V6-4.3L VIN XSECTION Body Control Module (BCM) - Programming & Setup
BODY CONTROL MODULE PROGRAMMING AND SETUP
BODY CONTROL MODULE (BCM) REPLACEMENT
If the body control module (BCM) is replaced, the following procedures must be performed in the following order:
1. BCM Reprogramming-Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
2. Theft Learn-Refer to Programming Theft Deterrent System Components in Theft Deterrent. A new BCM will learn the Passlock information automatically but the powertrain control module (PCM) must still learn the theft information from the BCM.
BCM REPROGRAMMING
If the BCM is reprogrammed, the following procedures must be performed:
1. BCM Reprogramming-Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
2. Theft Learn-Refer to Programming Theft Deterrent System Components in Theft Deterrent.
INFLATABLE RESTRAINT SENSING AND DIAGNOSTIC MODULE (SDM) REPLACEMENT
If the sensing and diagnostic module (SDM) is replaced, the following procedures must be performed in the following order:
1. BCM Reprogramming-Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems.
2. Theft Learn-Refer to Programming Theft Deterrent System Components in Theft Deterrent.
PASSLOCK SENSOR REPLACEMENT
If the Passlock Sensor is replaced perform the theft learn procedure. Refer to Programming Theft Deterrent System Components in Theft Deterrent.
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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.