Hummer H2. Manual - part 269

Steering Wheel Controls - Terminal Identification - Upper Right (Radio-Seek/Volume) 

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - ENTERTAINMENT 

Begin the system diagnosis with the Diagnostic System Check - Entertainment System . The Entertainment 
System Diagnostic System Check will provide the following information: 

z

The identification of the control modules which command the system  

z

The ability of the control modules to communicate through the serial data circuit  

z

The identification of any stored diagnostic trouble codes (DTCs) and their status  

The use of the Entertainment System Diagnostic System Check will identify the correct procedure for 
diagnosing the system and where the procedure is located.

4

-

-

Not Used

5

L-GN

1011

Remote Radio Control Signal

Connector Part Information

z

50579406  

z

6-Way F Molex (BK)  

Pin

Wire Color

Circuit No.

Function

1

WH

2283

12-Volt Reference

2

L-GN

1011

Remote Radio Control Signal

3

BN

230

Steering Wheel Switch Dimming Control

4

-

-

Not Used

5

BK

1851

Ground

6

L-GN

1011

Remote Radio Control Signal

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

DIAGNOSTIC SYSTEM CHECK - ENTERTAINMENT SYSTEM

Test Description 

The numbers below refer to the step numbers on the diagnostic table. 

2: Lack of communication may be due to a partial malfunction of the class 2 serial data circuit or due to a 
total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular 
condition.First design uses a class 2 amplifier, 2nd design uses a non-class 2 amplifier.  

5: The presence of DTCs which begin with "U" indicate some other module is not communicating. The 
specified procedure will compile all the available information before tests are performed.  

Diagnostic System Check - Entertainment System 

Step

Action

Yes

No

1

1. Install a scan tool.  

2. Turn ON the ignition, with the 

engine OFF.  

Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does Not 

Power Up in Data Link 

Communications

2

Attempt to establish communication 
with the following: 

z

Radio  

z

Amplifier (1st design only), 
refer to Radio/Audio System 
Description and Operation 
for explanation of designs.  

z

Body control module (BCM)  

z

Auxiliary HVAC control 
module  

z

Digital Radio Receiver (DRR)  

 
Does the scan tool communicate with 
the radio, amplifier, BCM, auxiliary 
HVAC control module, and DRR?

Go to Step 3

Go to Scan Tool Does Not 

Communicate with Class 2 

Device in Data Link 

Communications

1. Access the Class 2 Power 

Mode in the Diagnostic Circuit 

IMPORTANT:

The engine may start during the 
following step. Turn OFF the 
engine as soon as you have 
observed the Crank power mode.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

SCAN TOOL DATA LIST 

Audio Amplifier 

3

Check on the scan tool.  

2. Rotate the ignition switch 

through all positions while 
observing the ignition switch 
power mode parameter.  

Does the ignition switch parameter 
reading match the ignition switch 
position for all switch positions?

Go to Step 4

Go to Power Mode 

Mismatch in Body Control 

System

4

Select the following display DTCs 
function on the scan tool: 

z

Radio  

z

Amplifier (1st design only)  

z

Body control module (BCM)  

z

Auxiliary HVAC control 
module  

z

Digital Radio Receiver (DRR)  

 
Does the scan tool display any 
DTCs?

Go to Step 5

Go to Symptoms - 

Entertainment

5

Does the scan tool display any DTCs 
which begin with a "U"?

Go to Scan Tool Does Not 

Communicate with Class 2 

Device in Data Link 

Communications

Go to Step 6

6

Does the scan tool display DTC 
B1000?

Go to Diagnostic Trouble 

Code (DTC) List in Body 

Control System

Go to Step 7

7

Does the scan tool display DTC 
B1327?

Go to Diagnostic Trouble 

Code (DTC) List in Engine 

Electrical

Go to Diagnostic Trouble 

Code (DTC) List

Scan Tool Parameter

Data 

List

Units Displayed

Typical Data 

Value

Operating Conditions: Ignition in RUN, Radio ON

Audio Device

Data

Null/Tuner/CD Player

Varies

Balance

Data

Value

-50 to +50

Bass

Data

Percent

0-100%

Battery Voltage

Data

Volts

0-18V

Front Left, Front Right, LF Woofer, Back Left, Back 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2

  

Radio 

Rear Seat Audio (RSA) Controller 

SCAN TOOL DATA DEFINITIONS 

8-Digit GM Part Number  

Chime Speaker

Data

Right, RF Woofer

Varies

Chime Volume

Data

Percent

0-100%

External Audio Device

Data

Connected/Not Connected

Varies

Fade

Data

Value

-50 to +50

Ignition Since Current 
DTC

Data

Cycles

0-225

Microphone Level

Data

Percent

0-100%

Noise Compensation

Data

On/Off

Varies

Treble

Data

Percent

0-100%

Volume

Data

Percent

0-100%

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Radio ON

8-Digit GM Part Number

ID Information

Numeric

Varies

Balance

Data

Value

-50 to +50

Bass

Data

Percent

0-100%

Battery Voltage

Data

Volts

0-18V

Cal. Module 1 Part No.

ID Information

Numeric

Varies

Cal. Module 1 Suffix

ID Information

Varies

Varies

Fade

Data

Value

-50 to +50

Ignition Since Current DTC

Data

Cycles

0-225

Midrange

Data

Percent

0-100%

Operational S/W Part No.

ID Information

Numeric

Varies

Operational S/W Suffix

ID Information

Varies

Varies

Signal Strength

Data

dB

0-225

Treble

Data

Percent

0-100%

Volume

Data

Percent

0-100%

Scan Tool Parameter

Data List

Units Displayed

Typical Data Value

Operating Conditions: Ignition in RUN, Radio ON

Battery Voltage

Data

Volts

0-18V

CD Changer Disc Number

Data

Varies

1

CD Changer Track Number

Data

Varies

1

Ignition Since Current DTC

Data

Cycles

0-225

Single CD Disc Number

Data

Varies

1

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Entertainment - Hummer H2