Hummer H2. Manual - part 772

Tighten: Tighten the WSS mounting bolt to 18 N.m (13 lb ft).

Fig. 16: Front Wheel Speed Sensor Cable 
Courtesy of GENERAL MOTORS CORP. 

3. Install the WSS cable mounting clip to the knuckle.  

4. Install the WSS cable mounting clip to the upper control arm.  

5. Install the WSS cable mounting clip to the frame attachment point. 

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2

  

6. Connect the WSS cable electrical connector.  

7. Install the brake rotor. Refer to Brake Rotor Replacement - Front in Disc Brakes.  

8. Install the tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.  

9. Return to Diagnostic Starting Point - Anti-lock Brake System .  

WHEEL SPEED SENSOR REPLACEMENT - REAR 

Removal Procedure 

Fig. 17: Rear Wheel Speed Sensor & Shim 
Courtesy of GENERAL MOTORS CORP. 

1. Raise the vehicle. Refer to Lifting and Jacking the Vehicle in General Information.  

2. Disconnect the electrical connector.  

3. Remove the wheel speed sensor retaining bolt. 

CAUTION: Refer to Brake Dust Caution in Cautions and Notices.

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2

  

4. Remove the wheel speed sensor and shim if present.  

Installation Procedure 

Fig. 18: Rear Wheel Speed Sensor & Shim 
Courtesy of GENERAL MOTORS CORP. 

1. Install the shim, if removed with the sensor, and the wheel speed sensor. 

2. Install the wheel speed sensor retaining bolt. 

Tighten: Tighten the bolt to 14 N.m (124 lb in).

IMPORTANT: If a shim was removed when the wheel speed sensor was removed, it 

must be reinstalled to ensure proper operation.

IMPORTANT: If a shim was removed when the wheel speed sensor was removed, it 

must be reinstalled to ensure proper operation.

NOTE:

Refer to Fastener Notice in Cautions and Notices.

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2

  

3. Connect the electrical connector.  

4. Lower the vehicle.  

5. Perform a low speed test to ensure the wheel speed sensor is functioning properly: 

A. Start the engine and allow it to idle.  

B. Check to see if the ABS indicator or the traction assist indicator remains illuminated.  

C. If the ABS indicator or the traction assist indicator remains illuminated, DO NOT proceed to drive 

the vehicle until it is diagnosed and repaired. Check the wheel speed sensor electrical connector to 
ensure it is not damaged and is installed properly. If the lamp remains illuminated, refer to 
Symptoms - Anti-lock Brake System .  

D. Select a smooth, dry, clean, and level road or large lot that is as free of traffic and obstacles as 

possible.  

E. Drive the vehicle and maintain a speed of at least 16 km/h (10 mph) for at least 5 seconds.  

F. Stop the vehicle and check to see if the ABS indicator or the traction assist indicator is illuminated. 

G. If an indicator is illuminated, refer to Diagnostic Starting Point - Anti-lock Brake System .  

TRACTION CONTROL SWITCH REPLACEMENT 

Removal Procedure 

 

2004 Hummer H2 

2004 BRAKES Anti-Lock Brake System - Hummer H2