Hummer H2. Manual - part 635

 

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Hummer H2. Manual - part 635

 

 

6

1. Turn OFF the ignition.  

2. Disconnect the appropriate mirror.  

3. Turn ON the ignition, with the engine 

OFF.  

4. Measure the voltage between the 5 volt 

reference circuit at the mirror harness 
connector and a good ground.  

Does the voltage measure within the specified 
range?

4.75 - 

5.25 V

Go to Step 7

Go to Step 10

7

Measure the voltage between the 5 volt 
reference circuit and the low reference circuit at 
the mirror harness connector. 
Does the voltage measure within the specified 
range?

4.75 - 

5.25 V

Go to Step 12

Go to Step 11

8

Test for a short to voltage on the mirror position 
signal circuit. Refer to Circuit Testing and 
Wiring Repairs in Wiring Systems. 
Did you find and correct the condition?

-

Go to Step 16

Go to Step 13

9

Test the mirror position signal circuit for an 
open, high resistance, short to ground or battery. 
Refer to Circuit Testing and Wiring Repairs 
in Wiring Systems. 
Did you find and correct the condition?

-

Go to Step 16

Go to Step 13

10

Test the 5 volt reference circuit for an open, 
high resistance, short to ground or battery. Refer 
to Circuit Testing and Wiring Repairs in 
Wiring Systems. 
Did you find and correct the condition?

-

Go to Step 16

Go to Step 13

11

Test the low reference circuit for an open, high 
resistance or short to battery. Refer to Circuit 
Testing and Wiring Repairs in Wiring 
Systems. 
Did you find and correct the condition?

-

Go to Step 16

Go to Step 13

12

Inspect for poor connections at the harness 
connector of 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 16

Go to Step 14

13

Inspect for poor connections at the harness 
connector of the DDM/PDM. Refer to Testing 
for Intermittent Conditions and Poor 
Connections and Connector Repairs in Wiring 
Systems. 

-

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

DTC B1640 OR B1645 

Circuit Description 

The DDM and PDM supply battery voltage to the mirror heating element supply voltage circuit upon receipt of 
a class 2 message from the BCM indicating that the rear defrost system is active. The DDM and PDM also 
supply a constant ground for the mirror heating elements. 

Conditions for Running the DTC 

z

System voltage between 9.0-16.0 volts  

z

Ignition switch is in the ON position  

Conditions for Setting the DTC 

When the DDM and PDM supply battery voltage to the mirror heating element supply voltage circuit and it's 
shorted to ground. 

Action Taken When the DTC Sets 

The DDM and PDM will ignore the class 2 message and stop supplying battery voltage on the shorted circuit. 

Conditions for Clearing the DTC 

Did you find and correct the condition?

Go to Step 16

Go to Step 15

14

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

-

Go to Step 16

-

15

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 replacement?

IMPORTANT:

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

-

Go to Step 16

-

16

1. Use the scan tool in order to clear the 

DTCs.  

2. Operate the vehicle within the Conditions 

for Running the DTC as specified in the 
supporting text.  

Does the DTC reset?

-

Go to Step 2

System OK

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

When the short circuit is no longer present, the DDM/PDM will clear the current DTC and store the DTC as a 
history DTC. The history DTC will clear after 50 fault free ignition cycles or in response to a scan tool 
command. 

DTC B1640 or B1645 

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 System 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. Activate the rear defroster switch.  

Does DTC B1640 or B1645 set as current in the DDM or 
PDM?

Go to 

Step 3

Go to Testing for 

Intermittent Conditions and 

Poor Connections in Wiring 

Systems

3

1. Turn OFF the ignition.  

2. Disconnect the appropriate heated mirror.  

3. Turn ON the ignition, with the engine OFF.  

4. Activate the rear defroster switch.  

Does DTC B1640 or B1645 set as current in the DDM or 
PDM?

Go to 

Step 5

Go to Step 4

4

Inspect for poor connections at the heated mirror. Refer to 
Testing for Intermittent Conditions and Poor 
Connections and to Connector Repairs in Wiring Systems.
Did you find and correct the condition?

Go to 

Step 8

Go to Step 6

5

Inspect for poor connections at the harness connector of the 
appropriate door module. Refer to Testing for Intermittent 
Conditions and Poor Connections and to Connector 
Repairs in Wiring Systems. 
Did you find and correct the condition?

Go to 

Step 8

Go to Step 7

6

Replace the heated mirror. Refer to Mirror Replacement . 
Did you complete the replacement?

Go to 

Step 8

-

7

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 replacement?

Go to 

Step 8

-

8

1. Use the scan tool in order to clear the DTCs.  

2. Operate the vehicle within the Conditions for Running 

the DTC.  

Does the DTC reset?

Go to 

Step 2

System OK

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

DTC B1722 

Circuit Description 

The Driver Door Module (DDM) and Passenger Door Module (PDM) switch the mirror fold motor control 
circuits to battery voltage and ground in response to mirror extend or retract command. 

Conditions for Running the DTC 

z

Battery voltage must be between 9.0-16.0 volts.  

z

The ignition switch is in the ON position.  

z

A mirror extend or retract function must be active.  

Conditions for Setting the DTC 

When the DDM or PDM switch the mirror fold motor control circuits to battery voltage and ground and one of 
the mirror fold motor control circuits are shorted to ground, shorted to battery or open. 

Action Taken When the DTC Sets 

The DDM or PDM will stop suppling battery voltage and ground to the mirror fold motor and the folding 
mirrors will be inoperative. 

Conditions for Clearing the DTC 

When the fault is no longer present, the door module changes the current DTC to a history DTC. The door 
module will clear the history DTC after 50 fault free ignition cycles, or in response to a scan tool command. 

DTC B1722 

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. Install a scan tool.  

2. Turn ON the ignition, with the engine OFF.  

3. Place the mirror select switch in the neutral/fold 

position.  

4. Place the mirror direction switch in both the 

left/extend and right/retract positions.  

Does DTC B1722 set as a current DTC?

-

Go to 

Step 

3

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

 

2004 Hummer H2 

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

  

 

 

 

 

 

 

 

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