Hummer H3. Manual — part 1609

Refer to Checking Aftermarket Accessories .

Inspect 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 .

Symptom List

Refer to Heated Seat Inoperative (Driver) or Heated Seat Inoperative (Passenger) in order
to diagnose the symptom.

HEATED SEAT INOPERATIVE (DRIVER)

Heated Seat Inoperative (Driver)

Step

Action

Values

Yes

No

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

1

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

-

Go to Step 2

Go to
Symptoms -
Seat
Heating and
Cooling

2

1. Turn ON the ignition.

2. Operate the heated seat switch

to the low and high positions.

Does the heated seat system operate
normal?

-

Go to Testing
for
Intermittent
Conditions
and Poor
Connections

Go to Step 3

3

Do the low and high switch
indicators operate normal?

-

Go to Step 6 Go to Step 4

4

1. Disconnect the heated seat

switch connector.

2. Connect a test lamp from the

ignition voltage supply circuit
terminal in the harness
connector to ground.

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - H3

Does the test lamp illuminate?

Go to Step 5

Go to Step

11

5

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

-

Go to Step 15

Go to Step

12

6

1. Disconnect the seat cushion

heater element 4-way
connector C319.

2. Connect a test lamp from the

battery voltage supply circuit
terminal in the seat harness
connector to ground.

Does the test lamp illuminate?

-

Go to Step 7

Go to Step

13

7

Connect a test lamp from the battery
voltage supply circuit terminal to the
ground circuit terminal in the C319
seat harness connector.
Does the test lamp illuminate?

-

Go to Step 8

Go to Step

14

8

1. Using a DMM measure the

resistance through the heated
seat switch from the heated seat
switch signal circuit terminal to
the ground circuit terminal in
the C319 seat harness
connector.

2. Operate the heated seat switch

in the high and low positions.

Is the resistance at or near the
specified values?

Hi 2.5K

ohms

Lo 4.9K

ohms

Go to Step 10 Go to Step 9

9

1. Disconnect the heated seat

switch connector.

2. Test the heated seat switch

high/low signal circuit for an
open or short to ground. Refer

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - H3

to Circuit Testing and to
Wiring Repairs .

Did you find and correct the
condition?

Go to Step 21

Go to Step

15

10

1. Disconnect the seat back heater

element 2-way connector.

2. Test the resistance through the

seat back heater element.

Is the resistance within the specified
values?

0.5-2 ohms

Go to Step 16

Go to Step

17

11

Repair the open or short to ground in
the ignition voltage supply circuit to
the heated seat switch. Refer to
Circuit Testing and to Wiring
Repairs .
Is the repair complete?

-

Go to Step 21

-

12

Repair the open or high resistance in
heated seat switch ground circuit.
Refer to Circuit Testing and to
Wiring Repairs .
Is the repair complete?

-

Go to Step 21

-

13

Repair the open or short to ground in
the battery voltage supply circuit to
the heated seat control module.
Refer to Circuit Testing and
Wiring Repairs .
Is the repair complete?

-

Go to Step 21

-

14

Repair the open or high resistance in
the heated seat control module
ground circuit. Refer to Circuit
Testing and to Wiring Repairs .
Is the repair complete?

-

Go to Step 21

-

15

Inspect for poor connections at the
heated seat switch. Refer to Testing
for Intermittent Conditions and
Poor Connections and to

-

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - H3

HEATED SEAT INOPERATIVE (PASSENGER)

Connector Repairs .
Did you find and correct the
condition?

Go to Step 21

Go to Step

18

16

Inspect for poor connections at the
seat cushion heater element. Refer to
Testing for Intermittent
Conditions and Poor Connections
and to Connector Repairs .
Did you find and correct the
condition?

-

Go to Step 21

Go to Step

19

17

Inspect for poor connections at the
seat back heater element. Refer to
Testing for Intermittent
Conditions and Poor Connections
and Connector Repairs .
Did you find and correct the
condition?

-

Go to Step 21

Go to Step

20

18

Replace the heated seat switch.
Refer to Lumbar Switch
Replacement .
Is the repair complete?

-

Go to Step 21

-

19

Replace the seat cushion heater
element. Refer to Driver Seat
Cushion Heater and Passenger
Seat Cushion Heater
Replacement.
Is the repair complete?

-

Go to Step 21

-

20

Replace the seat back heater
element. Refer to Driver Seat Back
Cushion Heater and Passenger
Seat Back Cushion Heater
Replacement.
Is the repair complete?

-

Go to Step 21

-

21

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

-

System OK

Go to Step 3

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Seat Heating and Cooling - H3