Hummer H2. Manual - part 512

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

  

7

2. With a test lamp connected to a good ground, 

probe the door lock actuator lock circuit at the 
door lock actuator harness connector.  

3. Activate a door lock switch to lock position.  

Does the test lamp illuminate?

Go to Step 8

Go to Step 14

8

1. With a test lamp connected to a good ground, 

probe the door lock actuator unlock circuit at 
the door lock actuator harness connector.  

2. Activate a door lock switch to unlock position. 

Does the test lamp illuminate?

Go to Step 12

Go to Step 15

9

Test for an open or short to ground in the door lock 
switch lock and unlock signal circuits. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to Step 19

Go to Step 11

10

Inspect for poor connections at the harness 
connector of the rear door lock switch. 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 19

Go to Step 16

11

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 19

Go to Step 17

12

Inspect for poor connections at the harness 
connector of the door lock actuator. 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 19

Go to Step 18

13

Repair the open in the rear door lock switch ground 
circuit. Refer to Wiring Repairs in Wiring Systems.
Did you complete the repair?

Go to Step 19

-

14

Repair the open the door lock actuator lock circuit. 
Refer to Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to Step 19

-

15

Repair the open in the door lock actuator unlock 
circuit. Refer to Wiring Repairs in Wiring Systems.
Did you find and correct the condition?

Go to Step 19

-

Replace the rear door lock switch. 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

POWER DOOR LOCKS INOPERATIVE - ENDGATE/LIFTGATE 

Power Door Locks Inoperative - Endgate/Liftgate 

16 Did you complete the repair?

Go to Step 19

-

17

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

IMPORTANT:

Perform the set procedure for the BCM. Refer to 
Body Control Module (BCM) Programming/RPO 
Configuration in Body Control System.

Go to Step 19

-

18

Replace the rear door lock actuator. Refer to Latch 
Replacement - Rear Door . 
Did you complete the repair?

Go to Step 19

-

19

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

1

Did you perform the Door Systems Diagnostic System 
Check?

Go to 

Step 2

Go to Diagnostic System Check 

- Door Systems

2

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

Go to 

Step 3

Go to Power Door Locks 

Inoperative (Front Door(s)) or 

Power Door Locks Inoperative 

(Rear Door(s))

3

Is the liftgate lock actuator inoperative?

Go to 

Step 4

Go to Testing for Intermittent 

Conditions and Poor 

Connections in Wiring Systems

4

1. Disconnect the liftgate lock actuator.  

2. With a test lamp connected to a good ground, 

probe the lock actuator lock circuit at the lock 
actuator harness connector.  

3. Activate a door lock switch to lock position.  

Does the test lamp illuminate?

Go to 

Step 5

Go to Step 7

5

1. With a test lamp connected to a good ground, 

probe the lock actuator unlock circuit at the lock 
actuator harness connector.  

2. Activate a door lock switch to unlock position.  

Does the test lamp illuminate?

Go to 

Step 6

Go to Step 8

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

POWER MIRRORS INOPERATIVE 

Power Mirrors Inoperative 

6

Inspect for poor connections at the harness connector of 
the liftgate lock actuator. 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 10

Go to Step 9

7

Repair the open the lock actuator lock circuit. Refer to 
Circuit Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

Go to 

Step 10

-

8

Repair the open in the lock actuator unlock circuit. 
Refer to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

Go to 

Step 10

-

9

Replace the liftgate lock actuator. Refer to Lock 
Actuator Replacement - Liftgate in Body Rear End. 
Did you complete the repair?

Go to 

Step 10

-

10

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: Outside Mirror Schematics 
Connector End View Reference:Power Door Systems Connector End Views

1

Did you perform the Door Systems Diagnostic 
System Check?

Go to Step 2

Go to Diagnostic 

System Check - 

Door Systems

2

1. Place the mirror select switch in the left mirror 

position.  

2. Activate the mirror position switch in the UP, 

DOWN, LEFT and RIGHT directions and 
note the operation.  

3. Place the mirror select switch in the right 

mirror position.  

4. Activate the mirror position switch in the UP, 

DOWN, LEFT and RIGHT directions and 
note the operation.  

Do both power mirrors operate properly?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

1. Install a scan tool.  

2. Monitor the mirror select switch and the 

mirror switch data parameters.  

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2