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 MANUALSCHEVROLET2002AVALANCHE 1500 2WD V8-5.3L VIN TREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTION
2002 Chevrolet Avalanche 1500 2WD V8-5.3L VIN T
Body Control Module: Testing and Inspection
2002 Chevrolet Avalanche 1500 2WD V8-5.3L VIN TSECTION Testing and Inspection
IMPORTANT: If any module is replaced, programming the module with the proper RPO configurations must be done prior to performing the Passlock Learn procedure.
1. The BCM must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options. If the BCM is not properly configured with the correct RPO codes the BCM will not control the features properly. Ensure that the following conditions exist in order to prepare for BCM programming:
^ The battery is fully charged.
^ The ignition switch is in the RUN position.
^ The DLC is accessible.
^ All disconnected modules and devices are reconnected before programming.
2. Follow the SPS instructions on the Techline Terminal and scan tool to program the BCM.
3. If the BCM fails to accept the program, perform the following steps:
^ Inspect all BCM connections.
^ Verify that the SPS Techline Terminal and scan tool have the latest software version.
Passlock Learn Procedures
Refer to the Theft Deterrent sub-system for the appropriate learn procedure.
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.
1. The BCM must be programmed with the proper RPO configurations. The BCM stores the information regarding the vehicle options. If the BCM is not properly configured with the correct RPO codes the BCM will not control the features properly. Ensure that the following conditions exist in order to prepare for BCM programming:
^ The battery is fully charged.
^ The ignition switch is in the RUN position.
^ The DLC is accessible.
^ All disconnected modules and devices are reconnected before programming.
2. Follow the SPS instructions on the Techline Terminal and scan tool to program the BCM.
3. If the BCM fails to accept the program, perform the following steps:
^ Inspect all BCM connections.
^ Verify that the SPS Techline Terminal and scan tool have the latest software version.
Passlock Learn Procedures
Refer to the Theft Deterrent sub-system for the appropriate learn procedure.
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.