Hummer H2. Manual — part 580

Heated Seat Inoperative

Step

Action

Yes

No

Schematic Reference:Driver Seat Schematics and 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. Start the engine.

3. Display the Heated Seat Status and Zone

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

4. Operate the heated seat switch in all modes.

Does the scan tool display the correct heated seat
parameters in relation to heated seat switch
operation?

Go to Step 8

Go to Step 4

4

1. Display the heated seat switch parameters in

the door module Inputs data list.

2. Press the head seat switches while observing

the scan tool parameters.

Does the scan tool display the heated seat switches
as active while the switches are pressed?

Go to Step 5

Go to Step 6

5

Do the heated seat switch indicators operate
normally?

Go to Step 13

Go to Step 12

6

1. Disconnect the heated seat switch harness

connector to the door module.

2. Test the resistance through the heated seat

switch from the voltage supply circuit
terminal to the back only select switch signal
circuit terminal while operating the heat level
switch.

Does the back only select switch have continuity
only when pressed?

Go to Step 7

Go to Step 10

Test the resistance through the heated seat switch
from the voltage supply circuit terminal to the
back/cushion select switch signal circuit terminal

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

7

while operating the back/cushion select switch.
Does the back/cushion select switch have continuity
only when pressed?

Go to Step 12

Go to Step 10

8

1. Disconnect the inoperative seat heater element

connector.

2. Connect a test lamp from the voltage supply

circuit terminal to the control circuit terminal
in the harness connector.

3. Operate the seat back and cushion switch to

the high mode.

Does the test lamp illuminate?

Go to Step 11

Go to Step 9

9

Test the seat heater element voltage supply and
ground circuits in the seat harness 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 18

Go to Step 13

10

Inspect for poor connections at the heated seat
switch harness connector to the door 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 18

Go to Step 14

11

Inspect for poor connections at the heated seat
element 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 18

Go to Step 15

12

Inspect for poor connections at the door 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 18

Go to Step 16

13

Inspect for poor connections at 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 18

Go to Step 17

14

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

Go to Step 18

-

15

Replace the inoperative heated seat element. Refer
to Seat Back Heater Element Replacement -
Front or to Seat Cushion Heater Element
Replacement - Front .

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

HEATED SEAT ALWAYS ON - REAR

Heated Seat Always On - Rear

HEATED SEAT INOPERATIVE - REAR

Heated Seat Inoperative - Rear

Is the repair complete?

Go to Step 18

-

16

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 18

-

17

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

Go to Step 18

-

18

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

System OK

Go to Step 3

Step

Action

Yes

No

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

1

Did you review the Heated Seats Description
and Operation and perform the necessary
inspections?

Go to Step 2

Go to

Symptoms -

Seats

2

Operate the rear 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

Disconnect the heated seat control module
connector.
Does the heated seat element still operate?

Go to Step 4

Go to Step 5

4

Repair the seat heater element supply circuit for
a short to voltage. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 6

-

5

Replace the heated seat control module.
Is the repair complete?

Go to Step 6

-

6

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

System OK

Go to Step 2

Step

Action

Values

Yes

No

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

1

Did you review the Heated Seats Description and
Operation and perform the necessary inspections?

-

Go to

Symptoms -

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2

Go to Step 2

Seats

2

Operate the rear 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. Disconnect the heated seat control module

connector.

2. Connect a test lamp from the ignition voltage

supply circuit terminal in the harness
connector to ground.

3. Turn ON the ignition.

Does the test lamp illuminate?

-

Go to Step 4

Go to Step

11

4

Connect a test lamp test from the battery voltage
supply circuit terminal in the heated seat control
module harness connector to ground.
Does the test lamp illuminate?

-

Go to Step 5

Go to Step

12

5

Connect a test lamp from battery voltage to the
ground circuit terminal in the heated seat control
module harness connector.
Does the test lamp illuminate?

-

Go to Step 6

Go to Step

13

6

1. Connect a test lamp from battery voltage to

the heated seat switch signal circuit terminal
in the heated seat control module harness
connector.

2. Press and release the heated seat switch.

Does the test lamp illuminate only while the heated
seat switch is pressed?

-

Go to Step 7

Go to Step

14

7

Connect a fused jumper wire from battery voltage
to the high indicator control circuit terminal in the
heated seat control module harness connector.
Does the heated seat switch high indicator
illuminate?

-

Go to Step 8

Go to Step

16

8

Connect a fused jumper wire from battery voltage
to the low indicator control circuit terminal in the
heated seat control module harness connector.
Does the heated seat switch low indicator
illuminate?

-

Go to Step 9

Go to Step

17

9

Test the resistance through the heated seat
thermistor from the heated seat control module
harness connector. Refer to Circuit Testing in
Wiring Systems.

7K-

12K

ohm

Go to Step

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Seats - Hummer H2