Hummer H2. Manual - part 2020

1. Before you start, be sure you have enough room around the vehicle. It should be parked on a level 

surface. 

2. Firmly apply the parking brake.  

3. With the engine off, turn the key to the RUN position, but don't start the engine.  

4. Without applying the regular brake, try to move the shift lever out of PARK (P) with normal effort.  

5. If the shift lever moves out of PARK (P), the vehicle needs service.  

Ignition Transmission Lock Check 

1. With the vehicle parked, set the parking brake.  

2. Try to turn the ignition key to LOCK in each shift lever position.  

3. With an automatic transmission, the key should turn to LOCK only when the shift lever is in PARK (P).  

4. With a manual transmission, the key should turn to LOCK only when you press the key release button.  

5. On all vehicles, the key should come out only in LOCK.  

Park Brake and Automatic Transmission PARK (P) Mechanism Check 

Follow this procedure to test the park brake and automatic transmission PARK mechanism: 

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Park on a fairly steep hill, with the vehicle facing downhill.  

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Keep your foot on the hydraulic brake pedal.  

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Set the park brake.  

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Check the park brake: 

1. Start the engine.  

2. Place the transmission in NEUTRAL.  

3. Slowly remove foot pressure from the regular brake pedal. If the vehicle moves, refer to Park 

Brake Adjustment in Park Brake.  

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In order to check the PARK (P) mechanism of an automatic transmission, follow steps 1-3 above then do 
the following: 

1. Shift to PARK (P).  

2. Release all brakes.  

Underbody Flushing Service 

IMPORTANT: Be ready to apply the regular brake immediately if the vehicle begins to 

move.

CAUTION: When performing this check, the vehicle could begin to move. You or 

others could be injured and property could be damaged. Make sure there 
is room in front of the vehicle in case the vehicle begins to roll. Be ready 
to apply the regular brake at once, should the vehicle begin to move.

 

2004 Hummer H2 

2004 GENERAL INFORMATION Maintenance and Lubrication - Hummer H2

  

At least every spring, use plain water to flush any corrosive materials from the underbody. Take care to clean 
thoroughly any areas where mud and other debris can collect.

 

2004 Hummer H2 

2004 GENERAL INFORMATION Maintenance and Lubrication - Hummer H2

  

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GENERAL INFORMATION 

Air Bag Deactivation Procedures - Hummer 

SPECIAL CARE DURING MECHANICAL REPAIRS 

In some instances, it may be necessary to remove the steering column or instrument panel to access electrical 
components. Observe specific manufacturer SERVICE PRECAUTIONS when working on a vehicle with an air 
bag system.  

Electrical power sources should NEVER be allowed to contact the inflator on the back of the air bag module. 
NEVER probe air bag system electrical wires with an analog volt-ohmmeter or test light. Always disable air bag 
system before servicing vehicle. See appropriate DISABLING & ACTIVATING AIR BAG SYSTEM 
procedure. Failure to disable system properly may result in accidental air bag deployment and possible personal 
injury.  

If air bag system is not fully functional for any reason, DO NOT drive vehicle until system is repaired and 
functions properly. DO NOT remove bulbs, modules, sensors, or other air bag components which will prevent 
air bag system from operating as designed. If air bag system is not functional, park vehicle until system is 
repaired and functions properly.  

SYSTEM OPERATION CHECK 

H2 WITH PASSENGER AIR BAG 

Turn ignition switch from OFF to ON or RUN position. AIR BAG warning light should flash 7 times and then 
turn off.  

WARNING:

To avoid injury from accidental air bag deployment, read and carefully 
follow all SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR 
BAG SYSTEM procedures. 

WARNING:

In an effort to create safer air bags, manufacturers are using dual stage 
inflator modules with 2 deployment stages. Some models use 2 stage 
deployment inflators on driver and passenger air bag modules. If stage 
one was used to deploy a dual stage inflator module, stage 2 may still be 
active. Therefore, a deployed 2 stage air bag inflator module must be 
treated as an active module. When deactivating an air bag system with 
deployed air bags, a deployed 2 stage air bag may still be active. If 
disposal of a deployed or undeployed dual stage module is required, both 
deployment loops must be energized to deploy the air bag. 

WARNING:

Use caution while reaching in and turning ignition switch to ON position. 

 

2004 Hummer H2 

GENERAL INFORMATION Air Bag Deactivation Procedures - Hummer

  

 

2004 Hummer H2 

GENERAL INFORMATION Air Bag Deactivation Procedures - Hummer