Hummer H2. Manual - part 757

Wheel Terminal Identification Speed Sensor (WSS) - LR 

Wheel Terminal Identification Speed Sensor (WSS) - RF 

B

YE

873

Left Front Wheel Speed Sensor Low Reference

Connector Part Information

z

12162193  

z

2-Way F Metri-Pack 150.2 Series Sealed Pull To Seat (BK)  

Pin

Wire Color

Circuit No.

Function

A

BK

884

Left Rear Wheel Speed Sensor Signal

B

RD

885

Left Rear Wheel Speed Sensor Low Reference

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2

  

Wheel Terminal Identification Speed Sensor (WSS) - RR 

Connector Part Information

z

12052641  

z

2-Way F Metri-Pack 150 Series (BK)  

Pin

Wire Color

Circuit No.

Function

A

D-GN

872

Right Front Wheel Speed Sensor Signal

B

TN

833

Right Front Wheel Speed Sensor Low Reference

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2

  

DIAGNOSTIC INFORMATION AND PROCEDURES 

DIAGNOSTIC STARTING POINT - ANTI-LOCK BRAKE SYSTEM 

Connector Part Information

z

12162193  

z

2-Way F Metri-Pack 150.2 Series Sealed Pull To Seat (BK)  

Pin

Wire Color

Circuit No.

Function

A

BN

882

Right Rear Wheel Speed Sensor Signal

B

WH

883

Right Rear Wheel Speed Sensor Low Reference

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2

  

Begin the system diagnosis with Diagnostic System Check - ABS . The 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 Diagnostic System Check will identify the correct procedure for diagnosing the system and 
where the procedure is located. 

DIAGNOSTIC SYSTEM CHECK - ABS 

Circuit Description 

The ABS Diagnostic System Check is an organized approach to identify problems associated with the EBCM. 
This check must be the starting point for any EBCM complaint, and will direct you to the next logical step in 
diagnosing the complaint. The EBCM is a very reliable component and is not likely the cause of the 
malfunction. Most system complaints are linked to faulty wiring, connectors, and occasionally to components. 
Understanding the ABS system and using the tables correctly will reduce diagnostic time and prevent 
unnecessary parts replacement. 

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.  

4: 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 - ABS 

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 

communications with the 
following control modules. 

z

Electronic brake 
control module 
(EBCM)  

z

Powertrain control 

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2