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 MANUALSCHEVROLET2003TRAILBLAZER 4WD L6-4.2L VIN SREPAIR AND DIAGNOSISTRANSMISSION AND DRIVETRAINTRANSMISSION CONTROL SYSTEMSRELAYS AND MODULES - TRANSMISSION AND DRIVETRAINRELAYS AND MODULES - TRANSFER CASECONTROL MODULESERVICE AND REPAIRTRANSFER CASE SHIFT CONTROL MODULE REPLACEMENT
2003 Chevrolet TrailBlazer 4WD L6-4.2L VIN S
Transfer Case Shift Control Module Replacement
2003 Chevrolet TrailBlazer 4WD L6-4.2L VIN SSECTION Transfer Case Shift Control Module Replacement
Transfer Case Shift Control Module Replacement
Removal Procedure
Important: The access panel is removed in order to visually see the electrical connectors and the location of the transfer case control module. It will also be easier to see the mounting and alignment slots for the transfer case control module mounting bracket.
1. Remove the access panel.
2. Remove the knee bolster panel.
3. Remove the lower instrument panel cover.
4. Remove the left hand heat, vent and air conditioning vent.
5. Remove the three electrical connectors from the transfer case control module.
6. Remove the transfer case control module.
Important: When removing the transfer control module, it is not uncommon for the mounting bracket to be removed at the same time the transfer case control module is removed.
7. Remove the transfer case control module from the mounting bracket.
Installation Procedure
Important: The following service procedure is more easily performed if the mounting bracket and the electrical connectors are installed on the transfer case module before installing the transfer case module to the central support bracket.
1. Install the mounting bracket to the transfer case control module.
2. Install the electrical connectors to the transfer case control module.
3. Install the transfer case control module assembly to the center support bracket.
4. Install the left hand heat, vent, and air conditioning vent assembly.
5. Install the lower instrument panel cover.
6. Install the knee bolster panel.
7. Install the access panel.
8. Program the transfer case shift control module. Refer to Transfer Case Control Module Reprogramming. Programming and Relearning
Removal Procedure
Important: The access panel is removed in order to visually see the electrical connectors and the location of the transfer case control module. It will also be easier to see the mounting and alignment slots for the transfer case control module mounting bracket.
1. Remove the access panel.
2. Remove the knee bolster panel.
3. Remove the lower instrument panel cover.
4. Remove the left hand heat, vent and air conditioning vent.
5. Remove the three electrical connectors from the transfer case control module.
6. Remove the transfer case control module.
Important: When removing the transfer control module, it is not uncommon for the mounting bracket to be removed at the same time the transfer case control module is removed.
7. Remove the transfer case control module from the mounting bracket.
Installation Procedure
Important: The following service procedure is more easily performed if the mounting bracket and the electrical connectors are installed on the transfer case module before installing the transfer case module to the central support bracket.
1. Install the mounting bracket to the transfer case control module.
2. Install the electrical connectors to the transfer case control module.
3. Install the transfer case control module assembly to the center support bracket.
4. Install the left hand heat, vent, and air conditioning vent assembly.
5. Install the lower instrument panel cover.
6. Install the knee bolster panel.
7. Install the access panel.
8. Program the transfer case shift control module. Refer to Transfer Case Control Module Reprogramming. Programming and Relearning
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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.