Hummer H2. Manual - part 208

RETAINED ACCESSORY POWER (RAP) DESCRIPTION AND OPERATION 

Serial Data Control of Retained Accessory Power (RAP) 

The class 2 modules receive the power mode message from the body control module (BCM) over the serial data 
circuits, indicating when the RAP power mode is current. The BCM monitors the ignition switch position, 
battery condition and passenger compartment doors status to determine whether RAP should be initiated. The 
modules then support the operation of the systems under their control as required by their RAP power mode 
operation. 

RAP will end when one of the following conditions is met: 

z

The BCM receives an input or class 2 message indicating the opening of any compartment door.  

z

The BCM internal timer for the RAP expires after approximately 10 minutes.  

z

The BCM detects a decrease in battery capacity below a prescribed limit.  

The BCM then sends a serial data power mode message Off-Awake ending the RAP function. 

The class 2 RAP functions are: 

z

The power windows  

z

The radio  

Relay Control of Retained Accessory Power (RAP) 

The sunroof is controlled through the sunroof relay. The body control module (BCM) keeps the sunroof relay 
energized during all power modes, except Off-Awake. The sunroof relay provides power for sunroof operation.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Retained Accessory Power - Hummer H2

  

2004 ACCESSORIES & EQUIPMENT

Cellular Communication - Hummer H2 

SPECIFICATIONS 

FASTENER TIGHTENING SPECIFICATIONS 

Fastener Tightening Specifications 

SCHEMATIC AND ROUTING DIAGRAMS 

CELLULAR COMMUNICATION SCHEMATIC ICONS 

Cellular Communication Schematic Icons 

Application

Specification

Metric

English

Antenna Cable Mounting Screw

5 N.m

44 lb in

Antenna Mast

6 N.m

53 lb in

Antenna Mounting Nut

5 N.m

44 lb in

Communication Module

2 N.m

18 lb in

Subwoofer Bolts

9 N.m

80 lb in

Icon

Icon Definition

IMPORTANT:

Twisted-pair wires provide an effective shield 
that helps protect sensitive electronic 
components from electrical interference. If 
the wires were covered with shielding, install 
new shielding. 
In order to prevent electrical interference 
from degrading the performance of the 
connected components, you must maintain 
the proper specification when making any 
repairs to the twisted-pair wires shown: 

z

The wires must be twisted a minimum 
of 9 turns per 31 cm (12 in) as 
measured anywhere along the length of 
the wires  

z

The outside diameter of the twisted 
wires must not exceed 6.0 mm (0.25 in)  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

ONSTAR SCHEMATICS 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2

  

Fig. 1: OnStar Diagrams 
Courtesy of GENERAL MOTORS CORP. 

COMPONENT LOCATOR 

CELLULAR COMMUNICATION COMPONENT VIEWS 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Cellular Communication - Hummer H2