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 MANUALSCHEVROLET2005TRAILBLAZER 4WD V8-5.3L VIN MREPAIR AND DIAGNOSISTESTING AND INSPECTIONPROGRAMMING AND RELEARNINGBODY CONTROL MODULE (BCM) - PROGRAMMING/RPO CONFIGURATION
2005 Chevrolet TrailBlazer 4WD V8-5.3L VIN M
Body Control Module (BCM) - Programming/RPO Configuration
2005 Chevrolet TrailBlazer 4WD V8-5.3L VIN MSECTION Body Control Module (BCM) - Programming/RPO Configuration
BODY CONTROL MODULE (BCM) PROGRAMMING/RPO CONFIGURATION
INTRODUCTION
All the procedures below are designed to set-up a new body control module (BCM) correctly during BCM related service. Some of the procedures may need to be performed separately when replacing other modules or components. Before you start, read these procedures carefully and completely.
IMPORTANT: The following procedures must be followed:
1. Programming the BCM
2. Programming Theft Deterrent System Components, if equipped with Passlock System
3. Relearn Restraints ID
PROGRAMMING THE BCM
IMPORTANT: After the procedure is completed, the personalization settings of the BCM are set to a default setting. Inform the customer that the personalization must be set again.
Perform the special function for BCM "Request BCM Info. for SPS" or select Service Programming Systems, and then refer to Service Programming System (SPS) in Programming and Setup.
PROGRAMMING THEFT DETERRENT SYSTEM COMPONENTS
IMPORTANT: This procedure has to be performed only for vehicles equipped with Passlock System.
If the 10 minute learn procedure is chosen, perform the special function for BCM "Request VTD Info. for SPS" or select Service Programming Systems, and then refer to Programming Theft Deterrent System Components in Theft Deterrent. If the Programming Theft Deterrent System Components in the Theft Deterrent procedure is not performed after a BCM replacement, one of the following conditions will occur:
- The vehicle will not be protected against theft by the Passlock System.
- The engine will not crank or start.
This procedure also needs to be performed when replacing the PASSLock sensor or when replacing the PCM with one used before in a different vehicle.
RELEARN RESTRAINTS ID
Perform the special function for BCM "Setup SDM Serial Number in BCM" with the scan tool.
This procedure may also need to be performed when replacing the SDM.
IMPORTANT: After programming, perform the following to avoid future misdiagnosis:
1. Turn the ignition OFF for 10 seconds.
2. Connect the scan tool to the data link connector.
3. Turn the ignition ON with the engine OFF.
4. Use the scan tool in order to retrieve history DTCs from all modules.
5. Clear all history DTCs.
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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.