Hummer H2. Manual — part 646

7

2. Connect a test lamp to a good ground.

3. Probe the door unlock relay coil battery

supply voltage circuit.

Does the test lamp illuminate?

Go to Step 8

Go to Step 27

8

1. Connect a test lamp to battery positive

voltage.

2. Probe the door actuator unlock control circuit

cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 10

Go to Step 9

9

1. Install the rear door unlock relay.

2. Remove the rear door lock relay.

3. Connect a test lamp to battery positive

voltage.

4. Probe the door lock actuator lock control

circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 11

Go to Step 27

10

1. Connect a test lamp to battery positive

voltage.

2. Probe the rear door unlock relay control

circuit.

Does the test lamp illuminate?

Go to Step 22

Go to Step 26

11

1. Connect a test lamp to battery positive

voltage.

2. Probe the rear door lock relay control circuit.

Does the test lamp illuminate?

Go to Step 23

Go to Step 25

12

1. Remove the rear door lock relay.

2. Connect a test lamp to a good ground.

3. Probe the battery positive voltage circuit

(high current) cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 13

Go to Step 27

13

With the test lamp connected to a good ground,
probe the lock relay control circuit cavity in the
fuse block.
Does the test lamp illuminate?

Go to Step 22

Go to Step 14

1. Connect a test lamp to battery positive

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

14

voltage.

2. Probe the lock relay control circuit cavity in

the rear fuse block.

3. Activate a door lock switch to the lock

position.

Does the test lamp illuminate?

Go to Step 15

Go to Step 22

15

With the test lamp connected to battery positive
voltage, probe the door lock actuator lock control
circuit cavity in the fuse block.
Does the test lamp illuminate?

Go to Step 25

Go to Step 16

16

1. Remove the rear door unlock relay.

2. With the test lamp connected to battery

positive voltage, probe the unlock relay
ground circuit cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 26

Go to Step 27

17

1. Remove the rear door unlock relay.

2. Connect a test lamp to a good ground.

3. Probe the battery positive voltage circuit

(high current) cavity in the fuse block.

Does the test lamp illuminate?

Go to Step 18

Go to Step 27

18

With the test lamp connected to a good ground,
probe the unlock relay control circuit cavity in the
fuse block.
Does the test lamp illuminate?

Go to Step 23

Go to Step 19

19

1. Connect a test lamp to battery positive

voltage.

2. Probe the unlock relay control circuit cavity

in the fuse block.

3. Activate a door lock switch to the unlock

position.

Does the test lamp illuminate?

Go to Step 20

Go to Step 23

20

With the test lamp connected to battery positive
voltage, probe the door lock actuator unlock
control circuit cavity in the rear fuse block.
Does the test lamp illuminate?

Go to Step 25

Go to Step 21

21

1. Remove the rear door lock relay.

2. With the test lamp connected to battery

positive voltage, probe the lock relay ground

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

circuit cavity in the rear fuse block.

Does the test lamp illuminate?

Go to Step 25

Go to Step 27

22

Test for an open short to ground or short to battery
in the door lock relay lock control circuit.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 33

Go to Step 28

23

Test for an open short to ground or short to battery
in the door unlock relay lock control circuit.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 33

Go to Step 28

24

Test for a short to ground in the door lock actuator
lock and unlock control circuits.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?

Go to Step 33

Go to Step 27

25

Inspect for poor connections at the rear door lock
relay. 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 33

Go to Step 29

26

Inspect for poor connections at the rear door unlock
relay. 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 33

Go to Step 30

27

Inspect for poor connections at the fuse block.
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 33

Go to Step 31

28

Inspect for poor connections at the harness
connector of the body control module. 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 33

Go to Step 32

29

Replace the rear door lock relay.
Did you complete the repair?

Go to Step 33

-

30

Replace the rear door unlock relay.
Did you complete the repair?

Go to Step 33

-

31

Replace the rear fuse block.
Did you complete the repair?

Go to Step 33

-

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

POWER DOOR LOCKS INOPERATIVE - ONE DOOR OR SWITCH

Power Door Locks Inoperative - One Door or Switch

32

Replace the BCM. Refer to Body Control Module
Replacement in Body Control System.
Did you complete the repair?

Go to Step 33

-

33

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: Door Lock/Indicator Schematics
Connector End View Reference: Power Door Systems Connector End Views
DEFINITION: This diagnostic table should be used to diagnose a failure of the rear door lock switch or
one rear door lock actuator.

1

Did you perform the Door Systems Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Door Systems

2

Activate the rear door lock switch to the lock and
unlock positions.
Do both rear passenger doors lock and unlock?

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

Go to Step 3

3

1. Install a scan tool.

2. Monitor the rear door lock switch data

parameter in the BCM data list.

Is the data parameter active without a switch
activation?

Go to Step 5

Go to Step 4

4

1. With the scan tool, monitor the rear door lock

switch data parameter in the BCM data list.

2. Activate the door lock switch to both the lock

and unlock positions.

Does the data parameter change with each switch
activation?

Go to Step 7

Go to Step 6

5

Disconnect the rear door lock switch.
Does the data parameter now display an inactive
state?

Go to Step 10

Go to Step 9

6

1. Disconnect the rear door lock switch.

2. Connect a test lamp to ground.

3. Probe the rear door lock switch ground circuit.

Does the test lamp illuminate?

Go to Step 9

Go to Step 13

1. Disconnect the inoperative door lock actuator.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2