Envoy 4WD L6-4.2L VIN S (2003)
Control Module: Service and Repair
Transfer Case Control Module Reprogramming
Transfer Case Control Module Reprogramming
Set-up for Module Programming/Reprogramming
Important: Ensure that the vehicle battery is fully charged and that a battery charger is no longer connected. If performing this procedure for module
replacement, install new module before proceeding. Before reprogramming close the doors and wait two minutes to allow other modules to stop
communicating via the class 2 data line. Failure to due so could result in a failed reprogramming procedure.
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Turn OFF all accessories.
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Turn ON the ignition, with the engine OFF.
Remote Programming Feature
1. Connect the scan tool to the vehicle.
2. Power-up the scan tool and select the Service Programming feature.
3. Select the appropriate vehicle.
4. Press the Request Info button on the scan tool.
5. Connect the scan tool to the computer station.
6. Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are
reprogramming or replacing the electronic control unit (ECU).
7. Select "vehicle" from the selection menu.
8. Select the module you wish to Program.
9. Select "Normal" for Programming Type.
10. Select the applicable software calibrations.
11. Transfer data file to the scan tool.
12. Reconnect the scan tool to the vehicle.
13. Turn ON the ignition, with the engine OFF.
14. Select the Service Programming feature on the scan tool.
15. Press the Program button on the scan tool.
Programming Using Scan Tool Pass-Through Connection
1. Connect the scan tool to vehicle and power it up.
2. Connect the computer station to the scan tool.
3. Select "PC Using Scan Tool Connection" from the programming menu on the computer station.
4. Follow the menu select items for reprogramming and provide information as to what type of device you are programming and whether you are
reprogramming or replacing the electronic control unit (ECU).
5. Select "vehicle" from the selection menu.
6. Select the module you wish to program.
7. Select "Normal" for Programming Type.
8. Select the applicable software calibrations.
9. Transfer data file to the scan tool.
