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