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 MANUALSCHEVROLET2004EXPRESS 1500 RWD V6-4.3L VIN XREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBODY CONTROL MODULETESTING AND INSPECTION
2004 Chevrolet Express 1500 RWD V6-4.3L VIN X
Body Control Module: Testing and Inspection
2004 Chevrolet Express 1500 RWD V6-4.3L VIN XSECTION Testing and Inspection
BODY CONTROL MODULE (BCM) PROGRAMMING/RPO CONFIGURATION
INTRODUCTION
The procedure below is designed to set-up the body control module (BCM) correctly after BCM related service. The Service Programming System (SPS) uses the vehicle identification number (VIN) to determine the regular production option (RPO) configuration that the vehicle had when it was built. The SPS programs the BCM with the RPO configuration. After a new BCM is programmed, the powertrain control module (PCM) must learn the new BCM's Passlock fuel enable password. Before you start, read these procedures carefully and completely.
BODY CONTROL MODULE (BCM) SETUP
Perform the following steps:
1. Ensure that the battery is fully charged.
2. Connect a scan tool to the data link connector (DLC).
3. Turn ON the ignition, with the engine and all accessories OFF.
4. Program the BCM. Refer to Service Programming System (SPS) in Programming.
5. Perform the Programming Theft Deterrent System Components in Theft Deterrent.
6. Clear all diagnostic trouble codes (DTCs) with the scan tool.
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.
INTRODUCTION
The procedure below is designed to set-up the body control module (BCM) correctly after BCM related service. The Service Programming System (SPS) uses the vehicle identification number (VIN) to determine the regular production option (RPO) configuration that the vehicle had when it was built. The SPS programs the BCM with the RPO configuration. After a new BCM is programmed, the powertrain control module (PCM) must learn the new BCM's Passlock fuel enable password. Before you start, read these procedures carefully and completely.
BODY CONTROL MODULE (BCM) SETUP
Perform the following steps:
1. Ensure that the battery is fully charged.
2. Connect a scan tool to the data link connector (DLC).
3. Turn ON the ignition, with the engine and all accessories OFF.
4. Program the BCM. Refer to Service Programming System (SPS) in Programming.
5. Perform the Programming Theft Deterrent System Components in Theft Deterrent.
6. Clear all diagnostic trouble codes (DTCs) with the scan tool.
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.
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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.