Hummer H2. Manual - part 499

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

Schematic Reference: Power Window Schematics or Door Lock/Indicator Schematics
Connector End View Reference:Power Door Systems Connector End Views

Did you perform the Door Systems Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Door Systems

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

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

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

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

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

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

control, memory recall or mirror tilt in reverse functions.

Conditions for Running the DTC

System voltage must be between 9.0-16.0 volts.

The mirror motor control circuits must be active.

Conditions for Setting the DTC

If the mirror motor control circuits are switched to battery voltage and the mirror motor control circuit is
shorted to ground.

If the mirror motor control circuits are switched to ground and the mirror motor control circuit is shorted
to battery voltage.

Action Taken When the DTC Sets

The outside rearview mirror will not operate properly on all axes.

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 B1544, B1600, or B1605

Step

Action

Yes

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

Did you perform the Door Systems Diagnostic
System Check?

Go to Step 2

Go to Diagnostic

System Check -

Door Systems

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

2. Activate the mirror switch in the up, down left

and right positions.

Does the mirror move properly with each activation?

Go to Testing for

Intermittent Conditions

and Poor Connections in

Wiring Systems

Go to Step 3

1. Turn OFF the ignition.

2. Disconnect the mirror from the appropriate

door module.

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

4. Probe each of the mirror motor down, right and

up/left control circuit pins at the door module
one at a time with a test lamp that is connected
to a good ground.

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

DTC B1580, B1590, B1610, OR B1620

Did the test lamp illuminate at any of the test points?

Go to Step 7

Go to Step 4

1. Connect a test lamp between the mirror motor

down control circuit pin and a good ground.

2. Activate the mirror switch to the down

position.

Does the test lamp illuminate?

Go to Step 5

Go to Step 8

1. Connect a test lamp between the mirror motor

right control circuit pin and a good ground.

2. Activate the mirror switch to the right position.

Does the test lamp illuminate?

Go to Step 6

Go to Step 8

1. Connect a test lamp between the mirror motor

up/left control circuit pin and a good ground.

2. Activate the mirror switch to the up and left

positions.

Does the test lamp illuminate?

Go to Step 7

Go to Step 8

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

Go to Step 10

Go to Step 9

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 10

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

Go to Step 10

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

Circuit Description

The mirror horizontal and vertical position sensors are potentiometers. The Driver Door Module (DDM) and
Passenger Door Module (PDM) provide these sensors with a 5 volt reference circuit and a low reference circuit.
The DDM/PDM monitors the horizontal and vertical position sensor signal circuits which change values based
on mirror position. These voltage values are used to determine mirror position and can be set into memory.
When the DDM/PDM receives a memory recall request, the DDM/PDM will control the power mirror to the
memory position based on the horizontal and vertical position sensor signal values.

Conditions for Running the DTC

Battery voltage must between 9.0-16.0 volts.

Conditions for Setting the DTC

The horizontal and/or vertical position sensor signal(s) are greater than 4.75 volts or less than 0.50 volts.

Action Taken When the DTC Sets

Memory movements on the malfunctioning axis are disabled.

Conditions for Clearing the DTC

When the fault is no longer present, the DDM/PDM changes the current DTC to a history DTC. The
DDM/PDM will clear the history DTC after 50 fault free ignition cycles.

Diagnostic Aids

If DTC B1580 is set by itself, the left horizontal position sensor signal circuit maybe open, shorted to
ground or battery

If DTC B1590 is set by itself, the left vertical position sensor signal circuit maybe open, shorted to
ground or battery

If DTC B1610 is set by itself, the right horizontal position sensor signal circuit maybe open, shorted to
ground or battery

If DTC B1620 is set by itself, the right vertical position sensor signal circuit maybe open, shorted to
ground or battery.

If DTCs B1580 and B1590 are both set, the left 5 volt reference or low reference circuit(s) maybe open,
shorted to ground or battery.

If DTCs B1610 and B1620 are both set, the right 5 volt reference or low reference circuit(s) maybe open,
shorted to ground or battery.

DTC B1580, B1590, B1610, or B1620

Step

Action

Value

(s)

Yes

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

2004 Hummer H2

2004 ACCESSORIES & EQUIPMENT Doors - Hummer H2

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