Hummer H2. Manual — part 579

Does the scan tool display the torso inward switch
as active?

Go to Step 8

Go to Step 11

8

1. Observe the Torso Outward Switch parameter

in the driver seat module Input/Output data
list.

2. Operate the torso outward switch.

Does the scan tool display the torso outward switch
as active?

Go to Step 19

Go to Step 12

9

1. Disconnect the lumbar switch connector.

2. Connect a fused jumper wire from the battery

voltage supply circuit terminal to the lumbar
forward switch signal circuit terminal in the
harness connector.

Does the scan tool display the lumbar forward
switch as Active?

Go to Step 18

Go to Step 14

10

1. Disconnect the lumbar switch connector.

2. Connect a fused jumper wire from the battery

voltage supply circuit terminal to the lumbar
rearward switch signal circuit terminal in the
harness connector.

Does the scan tool display the lumbar rearward
switch as Active?

Go to Step 18

Go to Step 15

11

1. Disconnect the lumbar switch connector.

2. Connect a fused jumper wire from the battery

voltage supply circuit terminal to the torso
inward switch signal circuit terminal in the
harness connector.

Does the scan tool display the torso inward switch
as Active?

Go to Step 18

Go to Step 16

12

1. Disconnect the lumbar switch connector.

2. Connect a fused jumper wire from the battery

voltage supply circuit terminal to the torso
outward switch signal circuit terminal in the
harness connector.

Does the scan tool display the torso outward switch
as Active?

Go to Step 18

Go to Step 17

13

Test the active lumbar or torso switch signal circuit
for a short to voltage. Refer to Circuit Testing and

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

LUMBAR SUPPORT INOPERATIVE (PASSENGER)

Lumbar Support Inoperative (Passenger)

to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 22

Go to Step 19

14

Test the lumbar forward switch signal 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 22

Go to Step 19

15

Test the lumbar rearward switch signal 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 22

Go to Step 19

16

Test the torso inward switch signal 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 22

Go to Step 19

17

Test the torso outward switch signal 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 22

Go to Step 19

18

Inspect for poor connections at the harness
connector of the lumbar switch assembly. 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 22

Go to Step 20

19

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 22

Go to Step 21

20

Replace the lumbar switch assembly. Refer to
Lumbar Switch Replacement .
Did you complete the replacement?

Go to Step 22

-

21

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

Go to Step 22

-

22

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

System OK

Go to Step 3

Step

Action

Yes

No

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

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

HEATED SEAT ALWAYS ON

Heated Seat Always On

1

Did you review the Lumbar System Description and
Operation and perform the necessary inspections?

Go to Step 2

Go to

Symptoms -

Seats

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. Disconnect the inoperative lumbar or torso

motor connector.

2. Connect a test lamp between the motor control

circuit terminals in the harness connector.

3. Operate the appropriate switch in both

directions.

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

Go to Step 6

Go to Step 4

4

Test the motor control circuits for an open or 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 5

5

Inspect for poor connections at the lumbar switch.
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 7

6

Inspect for poor connections at the inoperative lumbar
or torso motor. 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 lumbar switch. Refer to Lumbar Switch
Replacement .
Is the repair complete?

Go to Step 9

-

8

Replace the lumbar support/torso bolster motor
assembly. Refer to Lumbar Replacement - Front
Seat .
Is the repair complete?

Go to Step 9

-

9

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

System OK

Go to Step 3

Step

Action

Yes

No

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

HEATED SEAT INOPERATIVE

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

1

Did you perform the Power Seat Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Power Seat

Systems

2

Operate the heated seat system.
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. Display the Heated Seat Status parameter in

the driver seat module Input/Output data
list.

3. Start the engine.

Does the scan tool display the Heated Seat Status
parameter as Off?

Go to Step 6

Go to Step 4

4

Display the Heated Seat Mode parameter in the
door module Inputs data list.
Does the scan tool display the Heated Seat Mode
parameter as Off?

Go to Step 6

Go to Step 5

5

1. Turn OFF the ignition.

2. Disconnect the heated seat switch connector

to the door module.

3. Start the engine.

Does the scan tool display the Heated Seat Mode
parameter as Off?

Go to Step 7

Go to Step 8

6

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

Go to Step 9

-

7

Replace the heated seat switch. Refer to Heated
Seat Switch Replacement - Front .
Is the repair complete?

Go to Step 9

-

8

Replace the door module. Refer to Switch
Replacement - Door Lock and Side Window -
Driver or Switch Replacement - Door Lock and
Side Window - Passenger in Doors.
Is the repair complete?

Go to Step 9

-

9

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

System OK

Go to Step 3

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2