Hummer H2. Manual - part 574

z

The driver seat module will disable the affected adjuster motor.  

z

When the fault is no longer present, a history DTC will be stored in the driver seat module and motor 
operation will be restored.  

Conditions for Clearing the DTC 

z

The DTC will be current for as long as the fault is present.  

z

When the fault is no longer present the DTC will be a history status code.  

z

The history DTC will be cleared after 100 error free ignition cycles, or by using the scan tool clearing 
DTCs feature.  

Diagnostic Aids 

When an adjuster motor control circuit is shorted to ground the driver seat module will also set a DTC for the 
affected motor. 

DTC B3962 

Step

Action

Yes

No

Schematic Reference:Driver Seat Schematics 
Connector End View Reference:Power Seat Systems Connector End Views

1

Did you perform the Power Seat Systems 
Diagnostic System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Power Seat 

Systems

2

Attempt to operate all of the seat adjuster motors 
through the full range of adjustment. 
Do all of the seat adjuster motors operate 
normally?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

1. Disconnect the appropriate seat adjuster 

motor connector.  

2. Connect a test lamp across the adjuster 

motor control circuit terminals in the harness 
connector.  

3. Operate the appropriate seat adjuster switch 

in both directions.  

Does the test lamp illuminate when the switch is 
activated in both directions?

Go to Step 5

Go to Step 4

4

Test the motor control circuits for a short to 
ground. Refer to Circuit Testing and to Wiring 
Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 6

Inspect for poor connections at the adjuster motor 
connector. Refer to Testing for Intermittent 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

SYMPTOMS - SEATS 

1. Perform the Diagnostic System Check - Power Seat Systems before using the symptom tables in order 

to verify that all of following are true: 

z

There are no DTCs set.  

z

The control modules can communicate via the serial data link.  

2. Refer to the following system descriptions in order to familiarize yourself with the system functions: 

z

Power Seats System Description and Operation  

z

Lumbar Support Description and Operation  

z

Heated Seats Description and Operation (Front) or Heated Seats Description and Operation 
(Rear)  

z

Memory Seats Description and Operation  

Visual/Physical Inspection 

z

Inspect for aftermarket devices which could affect the operation of the power seat. Refer to Checking 
Aftermarket Accessories in Wiring Systems.  

z

Inspect the easily accessible or visible system components for obvious damage or conditions which could 
cause the symptom.  

5

Conditions and Poor Connections and to 
Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 7

6

Inspect for poor connections at the harness 
connector of the driver seat module. Refer to 
Testing for Intermittent Conditions and Poor 
Connections and to Connector Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 9

Go to Step 8

7

Replace the appropriate adjuster motor assembly. 
Refer to Seat Adjuster Motor Replacement - 
Front . 
Did you complete the replacement?

Go to Step 9

-

8

Replace the driver seat module. Refer to Memory 
Seat Control Module Replacement . 
Did you complete the replacement?

Go to Step 9

-

9

1. Use the scan tool in order to clear the DTCs. 

2. Operate the system in order to verify the 

repair.  

Does the DTC reset?

Go to Step 2

System OK

IMPORTANT: The following steps must be completed before using the symptom tables.

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

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: 

z

Power Seat Inoperative (Driver) or Power Seat Inoperative (Passenger)  

z

Power Seat Does Not Move Forward/Rearward (Driver) or Power Seat Does Not Move 
Forward/Rearward (Passenger)  

z

Power Seat Does Not Tilt Forward (Driver) or Power Seat Does Not Tilt Forward (Passenger)  

z

Power Seat Does Not Tilt Rearward (Driver) or Power Seat Does Not Tilt Rearward (Passenger)  

z

Power Seat Does Not Recline (Driver) or Power Seat Does Not Recline (Passenger)  

z

Memory Seat Feature Inoperative  

z

Lumbar Support Inoperative (Driver) or Lumbar Support Inoperative (Passenger)  

z

Heated Seat Always On  

z

Heated Seat Inoperative  

z

Heated Seat Always On - Rear  

z

Heated Seat Inoperative - Rear  

POWER SEAT INOPERATIVE (DRIVER) 

Power Seat Inoperative (Driver) 

Step 

or

Action

Yes

No

Schematic Reference: Driver Seat Schematics 
Connector End View Reference: Power Seat Systems Connector End Views 
DEFINITION: All of the seat adjuster motors are inoperative, the lumbar and bolster motors may also be 
inoperative.

1

Did you perform the Power Seat Diagnostic 
System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Power Seat 

Systems

2

Verify the fault is present. 
Does the system operate normally?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

1. Install a scan tool.  

2. Observe the Seat Adjuster Switch 

parameters in the driver seat module 
Input/Output data list.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

  

Do all of the Seat Adjuster Switch parameters 
display Active?

Go to Step 7

Go to Step 4

4

Operate the seat adjuster switches in both 
directions. 
Does the scan tool display the correct switch status 
parameters in relation to the actual switch 
positions?

Go to Step 9

Go to Step 5

5

1. Disconnect the seat adjuster switch 

connector.  

2. Using a DMM test for battery voltage at the 

switch supply voltage circuit terminal in the 
harness connector.  

Is battery voltage present on the switch supply 
voltage circuit?

Go to Step 8

Go to Step 6

6

Test the switch supply voltage circuit for an open 
or high resistance. Refer to Circuit Testing and to 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 12

Go to Step 9

7

1. Disconnect the seat adjuster switch 

connector.  

2. Test the active switch signal circuit for a 

short to voltage. Refer to Circuit Testing 
and to Wiring Repairs in Wiring Systems.  

Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the seat adjuster 
switch connector. Refer to Testing for 
Intermittent Conditions and Poor Connections 
and to Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 12

Go to Step 10

9

Inspect for poor connections at the driver seat 
module connectors. Refer to Testing for 
Intermittent Conditions and Poor Connections 
and to Connector Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 12

Go to Step 11

10

Replace the seat adjuster switch. Refer to Seat 
Switch Replacement - Power . 
Is the repair complete?

Go to Step 12

-

11

Replace the driver seat module. Refer to Memory 
Seat Control Module Replacement . 
Is the repair complete?

Go to Step 12

-

12

Operate the system to verify the repair. 
Did you correct the condition?

System OK

Go to Step 3

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2