Hummer H2. Manual - part 2662

4. Start the engine and test the automatic transfer case system for proper shift operation.  

TRANSFER CASE CONTROL MODULE REPROGRAMMING 

Set-up for Module Programming/Reprogramming 

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. Disconnect the scan tool from the vehicle and 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. 

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. 

z

Turn OFF all accessories.  

z

Turn ON the ignition, with the engine OFF.  

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

7. Select "Normal" for Programming Type.  

8. Select the applicable software calibrations.  

9. Transfer data file to the scan tool.  

TRANSFER CASE SHIELD REPLACEMENT 

Removal Procedure 

Fig. 9: Transfer Case Shield 
Courtesy of GENERAL MOTORS CORP. 

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.  

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

2. Remove the transfer case shield mounting bolts from the cross member.  

3. Remove the transfer case shield from cross member.  

Installation Procedure 

Fig. 10: Transfer Case Shield 
Courtesy of GENERAL MOTORS CORP. 

1. Install the transfer case shield to the cross member. 

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2

  

2. Install the transfer case shield mounting bolts the cross member. 

Tighten: Tighten the mounting bolts to 30 N.m (23 lb ft). 

3. Lower the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.  

TRANSFER CASE FLUID REPLACEMENT 

Removal Procedure 

IMPORTANT: When performing the following service procedures, use only hand tools to 

remove and install the fill or drain plugs.

 

2004 Hummer H2 

2004 DRIVELINE/AXLE Transfer Case - BW 4484 - Hummer H2