Hummer H2. Manual - part 429

Memory Switch  

This data parameter provides the status of the memory switch. 

Mirror 5 Volt Reference  

This data parameter provides a status indication of the 5-volt reference circuit for the OSRV position 
sensors. 

Mirror Fold Motor Current  

This parameter provides the detected amount of current (in mA) that is required to perform the active 
mirror fold action. 

Mirror Folding Operation  

This parameter indicates the mirror fold operation currently in process. 

Mirror Heater  

This parameter indicates the operational state of the mirror heater. 

Mirror Horizontal Position  

This parameter provides OSRV mirror horizontal position in volts. 

Mirror Motor  

This parameter provides information regarding the state of operation the mirror is currently activating. 

Mirror Select Switch  

This parameter indicates the current mirror select switch position. 

Mirror Switch Backlight  

The mirror switch backlight data parameter reflects the level of backlighting, in percent for the mirror 
switch. 

Mirror Switch Horizontal  

This data parameter provides the current status of the OSRV horizontal position adjustment switch. 

Mirror Switch Vertical  

This data parameter provides the current status of the OSRV vertical position adjustment switch.

 

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Mirror Vertical Position  

This parameter provides OSRV mirror vertical position information in volts. 

Program Software P/N  

This is the part number stored indication of the revision level of the program software. 

Program Software Suffix  

This suffix number is the stored indication of the revision level of the program software. 

Right Front Window Status  

This parameter indicates the status of the right front window. 

Right Rear Window Status  

This parameter indicates the status of the right rear window. 

Window Motor Current  

This parameter indicates the active status of the window lockout feature. 

Window Motor Output  

This parameter reflects the state of the PDM output to the window motor. 

Window Switch Backlight  

The window switch backlight data parameter reflects the level of backlighting, in percent for the window 
switch. 

DIAGNOSTIC TROUBLE CODE (DTC) LIST 

Diagnostic Trouble Code (DTC) List 

DTC

Diagnostic Procedure

Module(s)

B1023

DTC B1023

DDM/PDM

B1544

DTC B1544, B1600, or B1605

DDM/PDM

B1580

DTC B1580, B1590, B1610, or B1620

DDM/PDM

B1590

DTC B1580, B1590, B1610, or B1620

DDM/PDM

B1600

DTC B1544, B1600, or B1605

DDM/PDM

B1605

DTC B1544, B1600, or B1605

DDM/PDM

B1610

DTC B1580, B1590, B1610, or B1620

DDM/PDM

B1620

DTC B1580, B1590, B1610, or B1620

DDM/PDM

 

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DTC B1023 

Circuit Description 

The switch that failed and generated this diagnostic trouble code (DTC) is part of the DDM or the PDM. When 
a switch is activated, the DDM/PDM then either actuates the appropriate component or sends a message over 
the serial data link to the appropriate module to actuate the appropriate component. 

Conditions for Running the DTC 

z

System voltage is between 9.0 and 16 volts.  

z

Ignition switch is in the ON position.  

Conditions for Setting the DTC 

If the DDM or the PDM receives multiple inputs from a single switch at the same time for more then 160 
milliseconds, the DDM/PDM sets the DTC. The following switches will set this DTC: 

z

The door lock switch  

z

The power window switch  

z

The window lockout switch  

z

The mirror select switch  

Action Taken When the DTC Sets 

The DDM/PDM ignores the continuous inputs from the switch. The DDM/PDM will not respond to the invalid 
inputs as a command for the component. The DDM/PDM will respond to all other valid switch inputs. 

Conditions for Clearing the DTC 

When the switch input status changes, the DDM/PDM clears this current DTC and stores the DTC as a history 

B1640

DTC B1640 or B1645

DDM/PDM

B1645

DTC B1640 or B1645

DDM/PDM

B1722

DTC B1722

DDM/PDM

B3808

DTC B3808

BCM

B3809

DTC B3809

BCM

B3819

DTC B3819

BCM

B3820

DTC B3820

BCM

B3821

DTC B3821

BCM

B3822

DTC B3822

BCM

B3823

DTC B3823

BCM

B3824

DTC B3824

BCM

B3825

DTC B3825

BCM

 

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DTC. The history DTC will clear either after 50 ignition switch cycles without a repeated failure or in response 
to a scan tool command. 

DTC B1023 

DTC B1544, B1600, OR B1605 

Circuit Description 

The driver door and passenger door modules supply battery positive voltage and ground on opposing mirror 
motor control circuits upon receipt of a mirror switch activation or a class 2 message commanding mirror 

Step

Action

Yes

No

Schematic Reference: Power Window Schematics or 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

1. Install a scan tool.  

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

3. Observe the appropriate switch parameter in 

the input list using the scan tool.  

Does the scan tool display an inactive state?

Go to Step 3

Go to Step 4

3

1. Activate the switch in both directions.  

2. Observe the switch parameter using the scan 

tool.  

Does the switch parameter change state?

Go to Testing for 

Intermittent Conditions 

and Poor Connections in 

Wiring Systems

Go to Step 4

4

Inspect for poor connections/terminal tension at the 
door module 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 6

Go to Step 5

5

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 6

-

6

1. Clear the DTCs using the scan tool.  

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

 

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