Hummer H3. Manual — part 1708

Does the scan tool display On?

Go to Step 7

Go to Step 6

6

1. Turn OFF the ignition.

2. Disconnect the harness that contains

the rear defogger switch signal circuit
connector of the BCM.

3. Turn ON the ignition, with the engine

OFF.

4. Connect a test lamp between battery

voltage and the rear defogger switch
signal circuit at the BCM connector.

5. Depress the rear defogger switch.

Does the test lamp illuminate?

Go to Step 16

Go to Step 10

7

1. Connect a test lamp between the

defogger relay control circuit and
ground.

2. Depress the rear window defogger

switch.

Does the test lamp illuminate?

Go to Step 13

Go to Step 11

8

1. With a scan tool, select from the

Special Functions the Rear Defogger
Relay in the BCM output controls.

2. Command the Rear Defogger Relay

ON and OFF.

Do you hear a click when you command
the relay ON and OFF?

Go to Step 12

Go to Step 9

9

Connect a test lamp between the supply
voltage circuit of the rear defog relay
switched input and a good ground.
Does the test lamp illuminate?

Go to Step 11

Go to Step 12

10

Test the rear defogger switch signal circuit
and the rear defogger switch ground circuit
of the HVAC control module for an open
or short to voltage. Refer to Circuit
Testing and Wiring Repairs .

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3

Did you find and correct the condition?

Go to Step 20

Go to Step 12

11

Test for an open or high resistance in the
rear defogger relay control circuit and
ground circuit. Refer to Circuit Testing
and Wiring Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 16

12

Test the supply voltage circuit for the
following conditions:

An open

A high resistance

A short to ground

Refer to Circuit Testing and Wiring
Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 13

13

Test for the following in the rear defogger
indicator supply voltage circuit:

An open

A high resistance

A short to ground

Refer to Circuit Testing and Wiring
Repairs .
Did you find and correct the condition?

Go to Step 21

Go to Step 15

14

Inspect for poor connections at the rear
defog relay. 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 18

15

Inspect for poor connections at the harness
connector of the HVAC control module.
Refer to Testing for Intermittent
Conditions and Poor Connections and
Connector Repairs .

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3

POWER WINDOW INOPERATIVE - DRIVER DOOR

Power Window Inoperative - Driver Door

Did you find and correct the condition?

Go to Step 21

Go to Step 19

16

Inspect for poor connections at the harness
connector of the BCM. 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

17

Repair an open or high resistance in the
ground circuit of the rear defogger. Refer
to Wiring Repairs .
Did you complete the repair?

Go to Step 21

-

18

Replace the rear defog relay. Refer to
Relay Replacement (Attached to Wire
Harness) or Relay Replacement (Within
an Electrical Center) .
Did you complete the replacement?

Go to Step 21

-

19

Replace the HVAC control module. Refer
to Control Module References for
replacement, setup and programming.
Did you complete the replacement?

Go to Step 21

-

20

Replace the BCM. Refer to Control
Module References for replacement,
setup and programming.
Did you complete the replacement?

Go to Step 21

-

21

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

System OK

Go to Step 2

Step

Action

Yes

No

Schematic Reference: Moveable Window Schematics
Connector End View Reference: Window Systems Connector End Views

1

Did you perform the Diagnostic System
Check - Vehicle?

Go to Step 2

Go to
Diagnostic
System Check -
Vehicle

Verify that the driver door power window

Go to Testing

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3

2

is inoperative.
Does the driver door power window
operate normally?

for Intermittent
Conditions and
Poor
Connections

Go to Step 3

3

Are the power door locks inoperative also?

Go to Step 6

Go to Step 4

4

1. Turn OFF the ignition.

2. Disconnect the driver window motor.

3. Turn ON the ignition, with the engine

OFF.

4. Probe the power window motor left

front up control circuit of the driver
window motor harness connector with
a test lamp that is connected to a good
ground.

5. Activate the driver window switch to

the UP position.

Does the test lamp illuminate?

Go to Step 5

Go to Step 7

5

1. Connect a test lamp between the

power window motor left front up
control circuit of the driver window
motor harness connector and the
power window motor left front down
control circuit of the driver window
motor harness connector.

2. Activate the driver window switch to

the DOWN position.

Does the test lamp illuminate?

Go to Step 10

Go to Step 8

6

Test the battery positive voltage circuit of
the drivers switch assembly for a short to
ground or an open. Refer to Circuit
Testing and Wiring Repairs .
Did you find and correct the condition?

Go to Step 14

Go to Step 9

7

Test the power window motor left front up
control circuit of the driver window motor
for an open. Refer to Circuit Testing and

2007 Hummer H3

2007 ACCESSORIES & EQUIPMENT Fixed and Moveable Windows - H3