Hummer H2. Manual - part 221

1. Remove the I/P center trim panel. Refer to Trim Panel Replacement - Instrument Panel (I/P) Center 

in Instrument Panel, Gages, and Console. 

IMPORTANT: The vehicle communication interface module (VCIM) has a specific set of 

unique numbers that tie the module to each vehicle. These numbers, the 
10-digit station identification and the 11-digit electronic serial number, are 
used by the National Cellular Network and OnStar(R) to identify the 
specific vehicle. Because these numbers are tied to the vehicle 
identification number of the vehicle, you must never exchange these parts 
with those of another vehicle.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

Fig. 14: Communication Interface Module & I/P
Courtesy of GENERAL MOTORS CORP. 

2. Remove the screws that hold the communication interface module to the I/P. 

Fig. 15: Communication Interface Module 
Courtesy of GENERAL MOTORS CORP. 

3. Disconnect the antenna and the electrical connections from the communication interface module.  

4. Remove the communication interface module.  

Installation Procedure 

1. When replacing a VCIM, record the 11-digit electronic serial number (ESN) and the 10-digit station 

identification (STID) number from the label on the new VCIM. 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

Fig. 16: Communication Interface Module 
Courtesy of GENERAL MOTORS CORP. 

2. Connect the electrical and the antenna connections to the communication interface module. 

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

Fig. 17: Communication Interface Module & I/P 
Courtesy of GENERAL MOTORS CORP. 

3. Install the communication interface module screws. 

Tighten: Tighten the screws to 2 N.m (18 lb in). 

4. Install the I/P center trim panel. Refer to Trim Panel Replacement - Instrument Panel (I/P) Center in 

Instrument Panel, Gages, and Console. 

IMPORTANT: After replacing the vehicle communication interface module, you must 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2