Hummer H2. Manual — part 610

z

There are no DTCs set.

z

The control module(s) can communicate via the serial data link.

2. Review the system operation in order to familiarize yourself with the system functions. Refer to Sunroof

Description and Operation .

Visual/Physical Inspection

z

Inspect for aftermarket devices which could affect the operation of the Power Sunroof system. 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.

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 Sunroof Inoperative

z

Retained Accessory Power (RAP) On After Timeout in Retained Accessory Power, if the power
sunroof should operate longer than the RAP timeout, once the ignition has been turned OFF.

POWER SUNROOF INOPERATIVE

Test Description

The number below refer to the step number on the diagnostic table.

9: The testing of the ground circuit is to assure a good path to ground. An open at the grounding lug will
still illuminate a test lamp, through a weaker redundant grounding path. This path is not sufficient enough
to operate the sunroof motor.

Power Sunroof Inoperative

Step

Action

Value

(s)

Yes

No

Schematic Reference:Power Sunroof Schematics
Connector End View Reference:Master Electrical Component List

1

Did you perform the Power Sunroof
Diagnostic System Check?

-

Go to Step 2

Go to Diagnostic

System Check -

Power Sunroof

Operate the power sunroof system.
Does the system operate normally?

Go to Testing for

Intermittent

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Roof - Hummer H2

2

-

Conditions and Poor

Connections in

Wiring Systems

Go to Step 3

3

1. Disconnect the sunroof switch harness

connector.

2. Turn ignition ON, with engine OFF.

3. Connect a test lamp between the RAP

relay switched output circuit at the
sunroof switch harness connector and a
good ground.

Does the test lamp illuminate?

-

Go to Step 4

Go to Step 10

4

1. Connect a fused jumper wire to the

RAP relay switched output circuit at
the sunroof switch harness connector.

2. Observing the position of the sunroof

glass, try to operate the sunroof system
by connecting the other end of the
fused jumper wire, at the sunroof
switch harness connector, to either of
the following:

z

Sunroof switch open/tilt up
signal circuit

z

Sunroof switch close/tilt down
signal circuit

Does the system operate normally?

-

Go to Step 13

Go to Step 5

5

1. Disconnect the sunroof actuator motor

harness connector.

2. Test the sunroof switch open/tilt down

signal circuit for an open, or a short to
voltage. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

-

Go to Step 23

Go to Step 6

6

Test the sunroof switch close/tilt up signal
circuit for an open, or a short to voltage.
Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 23

Go to Step 7

7

Connect a test lamp between the RAP relay
switched output circuit at the sunroof
actuator motor harness connector and a good
ground.

-

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Roof - Hummer H2

Does the test lamp illuminate?

Go to Step 8

Go to Step 19

8

Connect a test lamp between the RAP relay
switched output circuit and the ground circuit
at the sunroof actuator motor harness
connector.
Does the test lamp illuminate?

-

Go to Step 9

Go to Step 16

9

Measure the resistance between the sunroof
actuator motor ground, at the sunroof
actuator motor harness connector, to a good
ground. Refer to Circuit Testing in Wiring
Systems.
Does the resistance measure near the
specified value?

0-

3ohm

Go to Step 14

Go to Step 17

10

1. Disconnect the sunroof actuator motor

harness connector.

2. Connect a test lamp between the RAP

relay switched output circuit at the
sunroof actuator motor harness
connector and a good ground.

Does the test lamp illuminate?

-

Go to Step 20

Go to Step 11

11

Test the RAP relay switched output circuits
for a short to ground. Refer to Circuit
Testing and Wiring Repairs in Wiring
Systems.
Did you find and correct the condition?

-

Go to Step 23

Go to Step 12

12

Test the sunroof switch open/tilt down and
close/tilt up signal circuits for a short to
ground. Refer to Circuit Testing and
Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

-

Go to Step 23

Go to Retained

Accessory Power

(RAP) Inoperative

in Retained

Accessory Power

13

Inspect for a poor connection at the sunroof
switch and harness connector. Refer to
Testing for Intermittent Conditions and
Poor Connections and Connector Repairs
in Wiring Systems?
Did you find and correct the condition?

-

Go to Step 23

Go to Step 21

14

Inspect for a poor connection at the sunroof
actuator motor. Refer to Testing for
Intermittent Conditions and Poor
Connections and Connector Repairs in
Wiring Systems.
Did you find and correct the condition?

-

Go to Step 23

Go to Step 15

Measure the resistance between the sunroof
switch open/tilt down and the sunroof switch

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Roof - Hummer H2

15

close/tilt up signal circuits. Refer to Circuit
Testing in Wiring Systems.
Does the resistance measure near the
specified value?

OL

Go to Step 22

Go to Step 19

16

Repair the ground circuit of the sunroof
actuator motor for an open. Refer to Circuit
Testing and Wiring Repairs in Wiring
Systems.
Did you complete the repair?

-

Go to Step 23

-

17

Repair the ground circuit of the sunroof
actuator motor for an open or high resistance.
Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?

-

Go to Step 23

-

18

Repair a short between the sunroof switch
open/tilt down and sunroof switch close/tilt
up signal circuits. Refer to Wiring Repairs
in Wiring Systems.
Did you complete the repair?

-

Go to Step 23

-

19

Repair an open in the RAP relay switched
output circuit to the sunroof actuator motor.
Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?

-

Go to Step 23

-

20

Repair the RAP relay switched output circuit
for an open or a high resistance to the
sunroof switch. Refer to Wiring Repairs in
Wiring Systems.
Did you complete the repair?

-

Go to Step 23

-

21

Replace the sunroof switch. Refer to
Sunroof Switch Replacement .
Did you complete the replacement?

-

Go to Step 23

-

22

Replace the sunroof actuator motor. Refer to
Power Sunroof Motor Replacement .
Did you complete the replacement?

-

Go to Step 23

-

23

1. Turn OFF the ignition.

2. Remove any jumper wires.

3. Connect all previously disconnected

components.

4. Replace the fuse if necessary.

5. Turn ignition On, with engine OFF.

6. 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 Roof - Hummer H2