GMC Hummer H2 2004 User manual

2004 RESTRAINTS
Seat Belts - Hummer H2
SPECIFICATIONS
FASTENER TIGHTENING SPECIFICATIONS
Fastener Tightening Specifications
SCHEMATIC AND ROUTING DIAGRAMS
SEAT BELT SCHEMATIC ICONS
Seat Belt Schematic Icons
Application Specification Metric English
Front Seat Belt Buckle Nut 53 N.m 39 lb ft
Front Seat Retractor Bolt 53 N.m 39 lb ft
Front Seat Upper Anchor Bolt 53 N.m 39 lb ft
Outboard Seat Belt Anchor Nut 53 N.m 39 lb ft
Rear Seat Belt Buckle Bolt 55 N.m 41 lb ft
Rear Seat Belt Latch Cover Screw 2 N.m 18 lb ft
Rear Seat Belt Retractor Bolts 55 N.m 41 lb ft
Rear Seat Belt to Body Bolt 55 N.m 41 lb ft
Retractor Tower Screw 2 N.m 18 lb ft
Icon Icon Definition
CAUTION:
When performing service on or near the SIR
components or the SIR wiring, the SIR
system must be disabled. Refer to SIR
Disabling and Enabling Zones. Failure to
observe the correct procedure could cause
deployment of the SIR components, personal
injury, or unnecessary SIR system repairs.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 1 © 2005 Mitchell Repair Information Company, LLC.
Helpmelearn
January-01-08 1:06:17 PM Page 1 © 2005 Mitchell Repair Information Company, LLC.

SEAT BELT SCHEMATICS
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 2 © 2005 Mitchell Repair Information Company, LLC.

Fig. 1: Seat Belt
Courtesy of GENERAL MOTORS CORP.
COMPONENT LOCATOR
SEAT BELT COMPONENT VIEWS
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 3 © 2005 Mitchell Repair Information Company, LLC.

Fig. 2: Seat Belt Switch Component Views
Courtesy of GENERAL MOTORS CORP.
Callouts For Fig. 2
SEAT BELT CONNECTOR END VIEWS
Seat Belt Terminal Identification Switch
Callout Component Name
1Seat Bolster Motor - Driver
2Seat Lumbar Motor - Driver
3Heated Seat Element - Driver Cushion
4C333
5Seat Belt Switch Connector
6Heated Seat Element - Driver Cushion Connector
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 4 © 2005 Mitchell Repair Information Company, LLC.

DIAGNOSTIC INFORMATION AND PROCEDURES
DIAGNOSTIC STARTING POINT - SEAT BELTS
Begin the system diagnosis by reviewing the Seat Belt System Description and Operation . Reviewing the
Description and Operation will help identify the correct symptom diagnostic procedure when a malfunction
exists. The Description and Operation will also assist in determining if the condition described by the customer
is normal system operation. Refer to Symptoms - Seat Belts in order to identify the correct procedure for
diagnosing the system and where the procedure is located.
OPERATIONAL AND FUNCTIONAL CHECKS
Perform the following inspection from the driver seat:
1. Turn the ignition switch to the ON position. Verify proper operation of the seat belt reminder lamp with
the belt buckled and with the belt unbuckled.
2. Inspect the shoulder belt guide in order to ensure that the following conditions are met:
zThe shoulder belt guide swivels freely.
zThe seat belt webbing is seated flatly in the guide slot.
Connector Part Information z12047663
z2-Way M Metri-Pack 150 Series Sealed (BK)
Pin Wire Color Circuit No. Function
ABK/WH 238 Seat Belt Switch-Left
BYE 234 Seat Belt Indicator Control
IMPORTANT: If the vehicle has been in a collision, refer to Repairs and Inspections Required
After a Collision for additional information.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 5 © 2005 Mitchell Repair Information Company, LLC.

zThe seat belt webbing does not bind.
3. Verify that the seat belt buckle faces inboard and is accessible.
4. Verify that the seat belt retractor units are securely attached.
5. Verify that the seat belt anchor bolts are secure.
6. Fully extend the seat belt webbing. Verify that the seat belt webbing does not have any twists or tears.
7. Allow the seat belt webbing to retract. Verify that the seat belt webbing returns freely and completely
back into the retractor.
8. Snap the seat belt latch plate into the buckle.
9. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle
remain locked when tugged.
10. Push the button on the buckle.
zVerify that the seat belt latch plate releases easily from the buckle.
zVerify that the button returns to its original position.
Repeat the inspection procedure, steps 2-10, from the front passenger seat.
Test the function of the automatic locking child restraint feature:
1. To engage the automatic locking feature, pull the belt to the fully extended position. Allow the belt to
retract to the proper position for the child seat and fasten the latch plate to the buckle. As the belt retracts,
a ratcheting sound should be heard.
2. To disengage the automatic locking feature, allow the belt to retract to the fully stowed position. Before
the belt is completely stowed, the cinch feature will reset, the ratcheting sound will stop and the belt will
extract freely.
Perform the following steps in order to inspect the center seat belts:
1. Verify that the center seat belts are accessible.
2. Verify that the center seat belts have no twists or tears in the webbing.
3. Snap the center seat belt latch plate into the buckle.
4. Sharply tug on the seat belt latch plate and the buckle. Verify that the seat belt latch plate and the buckle
remain locked when tugged.
5. Push the button on the buckle.
zVerify that the seat belt latch plate releases easily from the buckle.
zVerify that the button returns to its original position.
Repeat the inspection procedure, steps 2-10, from the rear seats. The child restraint feature is located on the
outboard position for the rear seat.
Repeat the center seat belt inspection procedure, steps 1-5, from the rear seat.
For information on removal of the rear seats cushions refer to Seat Replacement -Rear No. 1 , Seat
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 6 © 2005 Mitchell Repair Information Company, LLC.

Replacement -Rear No. 2 or Seat Cushion Frame Replacement -Rear in Seats.
Emergency Locking Retractors
1. Fasten the seat belts, an assistant is needed when the retractor under test is not part of the driver seat belt.
2. Accelerate the vehicle slowly to 16 km/h (10 mph) and apply the brakes firmly.
3. Verify that the seat belt locks when braking firmly.
4. If the belt does not lock, proceed with the following steps.
1. Remove the seat belt retractor assembly.
2. Tilt the seat belt retractor slowly.
Fig. 3: Tilting Seat Belt Retractor
Courtesy of GENERAL MOTORS CORP.
3. Ensure that the seat belt webbing can be pulled from the retractor at an inclination of 15 degrees or
less and cannot be pulled from the retractor at an inclination of 45 de
g
rees or more.
CAUTION: Perform this test in an area clear of other vehicles or obstructions. Do not
conduct this test on the open road. A large, empty parking lot is suitable.
Failure to observe this precaution may result in damage to the vehicle and
possible personal injury.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 7 © 2005 Mitchell Repair Information Company, LLC.

4. If the seat belt retractor does not operate as described, replace the retractor assembly. Refer to the
following procedures:
zSeat Belt Retractor Replacement -Left Front
zSeat Belt Retractor Replacement -Right Front .
zSeat Belt Retractor Replacement -No. 1 Rear
SYMPTOMS - SEAT BELTS
Visual/Physical Inspection
zInspect for aftermarket devices which could affect the operation of the Seat Belt System. Refer to
Checking Aftermarket Accessories in Wiring Systems.
zInspect the easily accessible or visible system components for obvious damage or conditions which could
cause the symptom.
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for
Intermittent Conditions and Poor Connections in Wiring Systems.
Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
zFasten Safety Belt Indicator/Chime Always On
zFasten Safety Belt Indicator/Chime Inoperative
FASTEN SAFETY BELT INDICATOR/CHIME ALWAYS ON
Fasten Safety Belt Indicator/Chime Always On
IMPORTANT: Review the Seat Belt System Description and Operation in order to familiarize
yourself with the system functions. Refer to Seat Belt System Description and
Operation .
Step Action Yes No
Schematic Reference:Seat Belt Schematics
Connector End View Reference:Seat Belt Connector End Views
1Did you review the Diagnostic Starting Point - Seat Belts? Go to
Step 2 Go to Dia
g
nostic Startin
g
Point - Seat Belts
2Did you perform the Diagnostic System Check - Instrument Cluster? Go to
Step 3
Go to Diagnostic System
Check -Instrument
Cluster
1. Install a scan tool.
2. Turn ON the ignition, with the engine OFF.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 8 © 2005 Mitchell Repair Information Company, LLC.

FASTEN SAFETY BELT INDICATOR/CHIME INOPERATIVE
Fasten Safety Belt Indicator/Chime Inoperative
3
3. Fasten the LF seat belt.
4. With a scan tool, observe the seat belt buckled
parameter in the instrument panel cluster (IPC) data
list.
Does the scan tool indicate that the seat belt is buckled? Go to Step 8 Go to Step 4
4
1. Disconnect the LF seat belt switch connector.
2. With a scan tool, observe the seat belt buckled
parameter in the instrument panel cluster (IPC) data
list.
Does the seat belt parameter change state? Go to
Step 5 Go to Step 6
5Replace the LF seat belt switch. Refer to Seat Belt Buckle Replacement -Front .
Did you complete the replacement? Go to Step 9 -
6
Test the signal circuit of the seat belt switch for a short to
ground. Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition? Go to Step 9 Go to Step 7
7
Replace the inflatable restraint sensing and diagnostic module
(SDM). Refer to Inflatable Restraint Sensing and
Diagnostic Module Replacement
Did you complete the replacement? Go to Step 9
-
8Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement in Instrument Panel, Gauges and Console.
Did you complete the replacement? Go to Step 9 -
9Operate the system in order to verify the repair.
Did you correct the condition? System OK Go to Step 2
Step Action Yes No
Schematic Reference:Seat Belt Schematics
Connector End View Reference:Seat Belt Connector End Views
1Did you review the Diagnostic Starting Point - Seat
Belts? Go to Step 2
Go to Diagnostic
Starting Point -Seat
Belts
2Did you perform the Diagnostic System Check -
Instrument Cluster ? Go to Step 3
Go to Diagnostic
System Check -
Instrument Cluster
1. Turn ON the ignition, with the engine OFF.
2. Observe the seat belt indicator illumination during
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:12 PM Page 9 © 2005 Mitchell Repair Information Company, LLC.

SEAT BELT SERVICE PRECAUTIONS
3
bulb check.
Does the seat belt indicator illuminate during bulb
check?
Go to
Symptoms -
Seat Belts Go to Step 4
4
1. Install a scan tool.
2. Unfasten the LF seat belt.
3. With a scan tool, observe the seat belt buckled
parameter in the instrument panel cluster (IPC)
data list.
Does the scan tool indicate that the seat belt is
unbuckled? Go to Step 5 Go to Step 6
5
Replace the IPC. Refer to Instrument Panel Cluster
(IPC) Replacement in Instrument Panel, Gauges and
Console.
Did you complete the replacement? Go to Step 11
-
6
1. Disconnect the LF seat belt switch connector.
2. With a scan tool, observe the seat belt buckled
parameter in the instrument panel cluster (IPC)
data list.
Does the seat belt parameter change state? Go to Step 7 Go to Step 8
7Replace the LF seat belt switch. Refer to Seat Belt Buckle Replacement -Front .
Did you complete the replacement? Go to Step 11 -
8
Test the signal circuit of the seat belt switch for an open
or high resistance. Refer to Circuit Testing and Wirin
g
Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 11 Go to Step 9
9
Test the ground circuit of the seat belt switch for an
open or high resistance. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition? Go to Step 11 Go to Step 10
10
Replace the inflatable restraint sensing and diagnostic
module (SDM). Refer to Inflatable Restraint Sensing
and Diagnostic Module Replacement
Did you complete the replacement? Go to Step 11
-
11 Operate the system in order to verify the repair.
Did you correct the condition? System OK Go to Step 2
IMPORTANT: If the vehicle has been in a collision, refer to Repairs and Inspections
Required After a Collision for additional information.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 10 © 2005 Mitchell Repair Information Company, LLC.

zDo not bleach or dye the seat belt webbing. Use only the following items in order to clean the seat belt
webbing:
{A mild soap and water solution
{A soft brush or cloth
zKeep sharp edges and damaging objects away from the seat belts. Do not bend or damage any part of the
seat belt buckle or the latch plate. Replace any seat belts that are cut or damaged in any manner.
zUse only the correct seat belt anchor nuts/bolts. Tighten the correct seat belt anchor nut/bolt/screw to the
correct torque value. Refer to Fastener Tightening Specifications .
zSome seat belts and retractors require service as a set with service replacement components only. Do not
repair individual components that must require service as a set.
zVerify that the replacement part number is correct for the vehicle at that seating position. Do not
substitute a seat belt from a different seating position.
REPAIR INSTRUCTIONS
REPAIRS AND INSPECTIONS REQUIRED AFTER A COLLISION
After a minor collision where no automatic restraint device was deplo
y
ed, seat belt s
y
stem replacement ma
y
not
CAUTION: Restraint systems can be damaged in a collision. To help avoid injury and
ensure that all parts in need of replacement are replaced:
zReplace any seat belt system that was in use during the collision
serious enough to deploy any automatic restraint device such as air
bags and seat belt pretensioners. This not only includes seat belt
systems in use by people of adult size, but seat belt systems used to
secure child restraints, infant carriers and booster seats, including
LATCH system and top tether anchorages.
zReplace any seat belt system that has torn, worn, or damaged
components. This not only includes adult seat belt systems, but
built-in child restraints and LATCH system components, if any.
zReplace any seat belt system if you observe the words "REPLACE"
or "CAUTION", or if a yellow tag is visible. Do not replace a seat belt
if only the child seat caution label is visible.
zReplace any seat belt system if you are doubtful about its condition.
This not only includes adult seat belt systems, but built-in child
restraints, LATCH system components, and any restraint system
used to secure infant carriers, child restraints, and booster seats.
Do NOT replace single seat belt system components in vehicles that have
been in a collision as described above. Always replace the entire seat belt
system with the buckle, guide and retractor assembly, which includes the
latch and webbing material.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 11 © 2005 Mitchell Repair Information Company, LLC.

b
e necessary, unless some of the parts are torn, worn, or damaged.
SEAT BELT BUCKLE REPLACEMENT - FRONT
Removal Procedure
Fig. 4: Inboard Seat Belt Buckle, Nut & Electrical Connection
Courtesy of GENERAL MOTORS CORP.
1. Remove the front seat belt buckle nut (1).
Disconnect the electrical connection (2). The ri
g
ht seat buckle is shown, the left is similar.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 12 © 2005 Mitchell Repair Information Company, LLC.

2. Remove the seat belt buckle from the vehicle.
Installation Procedure
1. Install the seat belt buckle in the vehicle.
2. Connect the electrical connection (2).
Fig. 5: Inboard Seat Belt Buckle, Nut & Electrical Connection
Courtesy of GENERAL MOTORS CORP.
NOTE: Refer to Fastener Notice in Cautions and Notices.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 13 © 2005 Mitchell Repair Information Company, LLC.

3. Install the front seat belt buckle nut (1).
Tighten: Tighten the nut to 53 N.m (39 lb ft).
SEAT BELT BUCKLE AND LATCH REPLACEMENT - NO. 2 REAR
Removal Procedure
Fig. 6: Handle Mounting Screws
Courtesy of GENERAL MOTORS CORP.
1. Remove the handle mounting screws (1).
2. Partiall
y
remove the seat cushion cover b
y
separatin
g
the cushion trim J-strips.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 14 © 2005 Mitchell Repair Information Company, LLC.

Fig. 7: Seat Belt Buckle & Seat Frame
Courtesy of GENERAL MOTORS CORP.
3. Remove the bolts attaching the buckle to the seat cushion frame.
4. Remove the buckle from the seat frame.
Installation Procedure
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 15 © 2005 Mitchell Repair Information Company, LLC.

Fig. 8: Seat Belt Buckle & Seat Frame
Courtesy of GENERAL MOTORS CORP.
1. Install the buckle to the seat frame.
2. Install the buckle bolts.
Tighten: Ti
g
hten the bolts to 53 N.m (39 lb ft).
NOTE: Refer to Fastener Notice in Cautions and Notices.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 16 © 2005 Mitchell Repair Information Company, LLC.

Fig. 9: Handle Mounting Screws
Courtesy of GENERAL MOTORS CORP.
3. Connect the seat cushion cover by joining the cushion J-strips.
4. Install the handle mounting screws.
Tighten: Tighten the screws to 7 N.m (61 lb in).
SEAT BELT RETRACTOR REPLACEMENT - LEFT FRONT
Removal Procedure
1. Move the front seat to the full forward position.
IMPORTANT: Do not remove the seat back cover from the head restraint retainers.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 17 © 2005 Mitchell Repair Information Company, LLC.

2. Remove the seat back cover and pad. Refer to Seat Back Cover and Pad Replacement - Front .
3. Separate the seat foam from the cardboard to gain access to the retainer on the seat belt side.
4. Remove the seat belt side cardboard retainers.
5. Move the cardboard outwards to gain access to the lower seat belt retractor bolt.
Fig. 10: Lower Seat Belt Retractor Bolt - Left Front
Courtesy of GENERAL MOTORS CORP.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 18 © 2005 Mitchell Repair Information Company, LLC.

6. Remove the retractor bolt.
Fig. 11: Retractor Tower Retaining Screw
Courtesy of GENERAL MOTORS CORP.
7. Remove the retractor tower retaining screw.
8. Remove the retractor tower cover.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 19 © 2005 Mitchell Repair Information Company, LLC.

Fig. 12: Upper Anchor Bolt -Right Front
Courtesy of GENERAL MOTORS CORP.
9. Remove the upper anchor bolt.
10. Remove the retractor from the seat.
Installation Procedure
1. Position the seat belt retractor onto the seat.
Line up the tab on the retractor to the tab on the seat frame.
2004 Hummer H2
2004 RESTRAINTS Seat Belts - Hummer H2
Helpmelearn
January-01-08 1:06:13 PM Page 20 © 2005 Mitchell Repair Information Company, LLC.