Hummer H2. Manual - part 306

Turn Signal/Multi-Function Switch Terminal Identification - C3 

Underhood Terminal Identification Lamp (If Equipped) 

z

8-Way F Metri-Pack 150 Series (BK)  

Pin

Wire Color

Circuit No.

Function

A

L-GN

1427

Right Turn Signal Switch Signal

B

PK

639

Ignition 1 Voltage

C

D-GN

1428

Left Turn Signal Switch Signal

D-F

-

-

Not Used

G

BK/YE

28

Horn Relay Control

H

WH

111

Hazard Switch Signal

Connector Part Information

z

12059800  

z

5-Way F Metri-Pack 150 Series (BK)  

Pin

Wire Color

Circuit No.

Function

A

TN

1851

Ground

B

YE/BK

307

Headlamp Switch Flash to Pass Signal

C

L-GN

11

Headlamp Dimmer Switch Signal

D-E

-

-

Not Used

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

Vanity Mirror Lamp Terminal Identification - Left 

Vanity Mirror Lamp Terminal Identification - Right 

Connector Part Information

z

12052641  

z

2-Way F Metri-Pack 150 Series Sealed (BK)  

Pin

Wire Color

Circuit No.

Function

A

OG

1732

Inadvertent Power Courtesy Lamps Supply Voltage

B

BK

1050

Ground

Connector Part Information

z

12047663  

z

2-Way M Metri-Pack 150 Series (BK)  

Pin

Wire Color

Circuit No.

Function

A

OG

1732

Inadvertent Power Courtesy Lamps Supply Voltage

B

BK

1050

Ground

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - LIGHTING SYSTEMS 

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

z

The identification of the control module(s) which command the system.  

z

The ability of the control module(s) to communicate through the serial data circuit.  

z

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

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

DIAGNOSTIC SYSTEM CHECK - LIGHTING SYSTEMS 

Test Description 

The number(s) below refer to the step number(s) 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.  

Connector Part Information

z

12047663  

z

2-Way M Metri-Pack 150 Series (BK)  

Pin

Wire Color

Circuit No.

Function

A

OG

1732

Inadvertent Power Courtesy Lamps Supply Voltage

B

BK

1050

Ground

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2

  

3: This step determines if an ignition switch power mode condition exists. The specified procedure will 
determine which diagnostic path is to be followed.  

4: This step determines if a Body Control Module (BCM) DTC based diagnostic path or a symptom 
based diagnostic path are to be followed.  

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.  

6: This step displays stored system related DTCs to be diagnosed.  

Diagnostic System Check - Lighting Systems 

Step

Action

Yes

No

1

Install a scan tool. 
Does the scan tool power up?

Go to Step 2

Go to Scan Tool Does 

Not Power Up in Data 

Link Communications

2

1. Turn ON the ignition, with the engine 

OFF.  

2. Attempt to establish communication with 

the body control module.  

Does the scan tool communicate with the body 
control module?

Go to Step 3

Go to Scan Tool Does 

Not Communicate 

with Class 2 Device in 

Data Link 

Communications

3

1. Access the Class 2 Power Mode in the 

Diagnostic Circuit Check on the scan tool.  

2. Rotate the ignition switch through all 

positions while observing the Class 2 
Power Mode on the Scan Tool. Refer to the 
Serial Data Power Mode table within Body 
Control System Description and 
Operation in Body Control System for a 
list of the power mode states that 
correspond to each ignition switch 
position.  

Does the ignition switch parameter reading 
match the ignition switch position for OFF, 
RUN, and CRANK?

IMPORTANT:

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

Go to Step 4

Go toPower Mode 

Mismatch in Body 

Control System

4

Select the BCM display DTCs function on the 
scan tool. 
Does the scan tool display any DTCs?

Go to Step 5

Go to Symptoms - 

Lighting Systems

Does the scan tool display any DTCs which 

Go to Scan Tool Does 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Lighting Systems - Hummer H2