Hummer H2. Manual - part 444

POWER MIRRORS - FOLDING INOPERATIVE 

Power Mirrors - Folding Inoperative 

10

Replacement . 
Did you complete the repair?

Go to Step 12

-

11

Replace the appropriate door module. Refer to 
Switch Replacement - Door Lock and Side 
Window - Driver or Switch Replacement - Door 
Lock and Side Window - Passenger .Did you 
complete the repair?

IMPORTANT:

Perform the set up procedure for the appropriate 
door module. Refer to Service Programming 
System (SPS) in Programming.

Go to Step 12

-

12

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. Turn ON the ignition, with the engine OFF.  

2. Place the mirror select switch in the neutral 

fold position.  

3. Activate the mirror direction switch in the 

left/extend and right/retract positions.  

Do the outside rearview mirrors extend and retract 
with the corresponding switch activation?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 3

3

Are both folding mirrors inoperative?

Go to Step 4

Go to Step 5

4

1. Install a scan tool.  

2. Monitor the mirror select switch and the 

mirror switch data parameters.  

3. Activate the mirror select switch left, right and 

neutral/fold positions.  

4. Activate the left/extend and right/retract 

functions from the mirror switch.  

Do all of the data parameters change with the 
corresponding switch activations?

Go to Step 5

Go to Step 6

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

5

1. Install a scan tool.  

2. With the scan tool, observe the Mirror Folding 

Operation data parameter in the appropriate 
door module data list.  

3. Command the inoperative mirror to retract and 

extend using the mirror switch.  

Does the Mirror Folding Operation data parameter 
change states with the corresponding command?

Go to Step 7

Go to Step 8

6

Inspect for poor connections at the driver door 
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 12

Go to Step 9

7

Inspect for poor connections at the power mirror. 
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 12

Go to Step 10

8

Inspect for poor connections at the appropriate door 
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 12

Go to Step 11

9

Replace the driver door module. Refer to Switch 
Replacement - Door Lock and Side Window - 
Driver .Did you complete the repair?

IMPORTANT:

Perform the set up procedure for the driver door 
module. Refer to Service Programming System 
(SPS) in Programming.

Go to Step 12

-

10

Replace the power mirror. Refer to Mirror 
Replacement . 
Did you complete the repair?

Go to Step 12

-

11

Replace the appropriate door module. Refer to 
Switch Replacement - Door Lock and Side 
Window - Driver or Switch Replacement - Door 
Lock and Side Window - Passenger .Did you 
complete the repair?

IMPORTANT:

Perform the set up procedure for the appropriate 
door module. Refer to Service Programming 
System (SPS) in Programming.

Go to Step 12

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

POWER MIRRORS - MEMORY FUNCTIONS INOPERATIVE 

Power Mirrors - Memory Functions Inoperative 

12

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

System OK

Go to Step 3

Step

Action

Value
(s)

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 Step 3

Go to Power 

Mirrors 

Inoperative

3

1. Install a scan tool.  

2. Turn ON the ignition, with the engine 

OFF.  

3. Monitor the memory switch data 

parameters.  

Are any of the memory switch data 
parameters active without a switch 
activation?

-

Go to Step 5

Go to Step 4

4

1. Monitor the memory switch data 

parameters.  

2. Activate the memory 1, memory 2 and 

Exit switches one at a time.  

Do all of the memory switch data parameters 
change state with the corresponding switch 
activation?

-

Go to Step 7

Go to Step 6

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

5

Disconnect the memory switch. 
Does the memory switch data parameter 
change to idle?

-

Go to Step 13

Go to Step 12

6

1. Disconnect the memory switch.  

2. Monitor the memory switch data 

parameter.  

3. Connect a 3-amp fused jumper 

between the memory switch battery 
positive voltage pin and each of the 
memory switch signal pins, one at a 
time, at the driver door module.  

Does the memory switch data parameter 
change state appropriately at each test point?

-

Go to Step 13

Go to Step 12

7

With a scan tool, monitor the Mirror 
Horizontal and Vertical Position data 
parameters of the inoperative mirror while 
commanding the mirror to move with the 
mirror switch. 
Do the Mirror Horizontal and Vertical 
Position data parameters change values with 
the corresponding mirror movement?

-

Go to Step 10

Go to Step 8

8

1. Disconnect the inoperative mirror.  

2. Measure the voltage between the 

mirror 5-volt reference circuit pin at 
the door module and a good ground.  

Does the voltage measure within the 
specified range?

4.75-

5.0 V

Go to Step 9

Go to Step 12

9

1. With a scan tool, monitor the Mirror 

Horizontal and Vertical Position data 
parameters.  

2. Connect a 3-amp fused jumper 

between the mirror 5-volt reference 
circuit pin and each of the horizontal 
and vertical position signal circuit pins 
at the door module one at a time.  

Do the Mirror Horizontal and Vertical 
Position data parameters display within the 
specified range?

4.75-

5.0 V

Go to Step 14

Go to Step 10

1. Connect the inoperative mirror.  

2. Backprobe the mirror 5-volt reference 

circuit with a DMM connected to a 

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2