Hummer H2. Manual — part 506
When the fault is no longer present, the BCM changes the current DTC to a history DTC. The BCM will clear
the history DTC after 50 fault free ignition cycles.
Schematic Reference: Power Window Schematics
Connector End View Reference:Power Door Systems Connector End Views
Did you perform the Door Systems Diagnostic
System Check?
2. Turn ON the ignition, with the engine OFF.
3. Disable the window lockout function.
4. With a scan tool, command the right rear
Does the right rear power window operate UP and
DOWN with each command?
Intermittent Conditions
and Poor Connections in
2. Disconnect the right rear power window
3. Turn ON the ignition, with the engine OFF.
4. Ensure the window lockout function is
5. Probe the window lockout signal circuit with
a test lamp connected to a good ground.
Does the test lamp illuminate?
Intermittent Conditions
and Poor Connections in
Test the window lockout signal circuit for a short to
ground. Refer to Circuit Testing and Wiring
Repairs in Wiring Systems.
Did you find and correct the condition?
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?
Perform the set up procedure for the Body
Control Module.
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
Hummer 2004 H2 User Manual
If the passenger’s door is not fully closed and the
vehicle is in a drive gear, this message will appear on
the display and you will hear a chime. Stop and turn off
the vehicle, check the door for obstacles, and close
the door again. Check to see if the message still
appears on the DIC. Pressing the select button will clear
it from the DIC display.
If the driver’s side rear door is not fully closed and the
vehicle is in a drive gear, this message will appear
on the display and you will hear a chime. Stop and turn
off the vehicle, check the door for obstacles, and
close the door again. Check to see if the message still
appears on the DIC. Pressing the select button will
clear it from the DIC display.
If the passenger’s side rear door is not fully closed and
the vehicle is in a drive gear, this message will
appear on the display and you will hear a chime. Stop
and turn off the vehicle, check the door for obstacles,
and close the door again. Check to see if the message
still appears on the DIC. Pressing the select button
will clear it from the DIC display.
If the liftgate is open while the ignition is in RUN, this
message will appear on the DIC and you will hear
a chime. Turn off the vehicle and check the liftgate.
Restart the vehicle and check for the message on the
DIC display. Pressing the select button will clear it
from the DIC display.
REPLACE LIFTGATE FUSE
This message will be displayed if the liftgate lock
malfunctions and/or the liftgate fuse blows. For more
information on fuses, see Fuses and Circuit Breakers on
page 5-102.
If the message returns after replacing the fuse, see you
dealer for service.
If a remote keyless entry transmitter battery is low, this
message will appear on the DIC. The battery needs
to be replaced in the transmitter. Pressing the select
button will clear it from the DIC display.
Hummer H2. Instruction — page 641
The body control module (BCM) internally grounds the liftgate lock relay control circuit for the liftgate lock
relay when it receives a Class 2 message from the driver door module (DDM), passenger door module (PDM),
or when a liftgate lock function is activated. When the BCM grounds the liftgate lock relay control circuit the
liftgate lock relay is energized and locks the liftgate.
Conditions for Running the DTC
Battery voltage is between 9.0-16.0 volts.
The DTC will set if the liftgate lock function is active or inactive.
Conditions for Setting the DTC
The DTC will set if the liftgate lock relay control circuit is shorted to ground or open for more then one second.
Action Taken When the DTC Sets
If a short to ground is present on the liftgate lock relay control circuit, the liftgate lock relay will be
energized and the liftgate lock actuator will be held in the lock position and will not unlock.
If an open condition is present on the liftgate lock relay control circuit, the liftgate will unlock but not
lock.
The BCM will send a Class 2 message to the DIC indicating that a fault has been detected and the DIC
will display REPLACE LIFTGATE FUSE.
Conditions for Clearing the DTC
When the fault is no longer present, the BCM changes the current DTC to a history DTC. The BCM will clear
the history DTC after 50 fault free ignition cycles.
DTC B3825 will set as current if any of the following conditions are present:
Replace the Body Control Module. Refer to Body
Control Module Replacement in Body Control
System.Did you complete the replacement?
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.
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
An open or short to ground in the liftgate lock relay battery positive voltage circuit
A faulty liftgate lock relay
An open or short to ground in the liftgate lock relay control circuit
A short to ground in the liftgate lock actuator lock control circuit will open the ECC with a lock
command
The numbers below refer to the step numbers on the diagnostic table.
2: Command both the Lock and Unlock states. Repeat the commands as necessary.
3: Tests for voltage at the coil side of the liftgate lock relay. The ECC fuse supplies power to the coil side
of the liftgate lock relay.
4: Verifies that the body control module is providing ground to the liftgate lock relay.
5: Tests if ground is constantly being applied to the liftgate lock relay.
Schematic Reference: Door Lock/Indicator Schematics
Connector End View Reference: Power Door Systems Connector End Views
Did you perform the Door Systems Diagnostic
System Check?
2. With a scan tool, command the rear doors to
Does the liftgate Lock and Unlock with each
command?
Intermittent Conditions
and Poor Connections in
1. Remove the liftgate lock relay.
2. Probe the battery positive voltage circuit of
the liftgate lock relay with a test lamp that is
connected to a good ground.
Does the test lamp illuminate?
1. Connect a test lamp between the liftgate lock
relay control circuit and the battery positive
voltage circuit of the liftgate lock relay.
2. With a scan tool, command the rear doors to
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
Does the test lamp turn ON and OFF with each
command?
Does the test lamp remain illuminated without being
commanded?
Test the liftgate lock relay control circuit of the
liftgate lock relay for an open. Refer to Circuit
Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?
Test the liftgate lock relay control circuit of the
liftgate lock relay for a short to ground or an open.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you find and correct the condition?
Test for an open or short to ground in the battery
positive voltage circuit of the liftgate lock relay.
Refer to Circuit Testing and Wiring Repairs in
Wiring Systems.
Did you complete the repair?
Inspect for poor connections at the liftgate lock
relay. Refer to Testing for Intermittent
Conditions and Poor Connections and Connector
Repairs in Wiring Systems.
Did you find and correct the condition?
Inspect for poor connections at the harness
connector of the body control module (BCM). Refer
to Testing for Intermittent Conditions and Poor
Connections and Connector Repairs in Wiring
Systems.
Did you find and correct the condition?
Repair the short to ground in the liftgate lock
actuator lock control circuit. Refer to Wiring
Repairs in Wiring Systems.
Did you complete the repair?
Replace the liftgate lock relay.
Did you complete the replacement?
Replace the BCM. Refer to Body Control Module
Replacement in Body Control System.Did you
complete the replacement?
Perform the set up procedure for the BCM.
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
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
1. Perform the Diagnostic System Check — Door Systems before using the Symptom Tables in order to
verify that all of the following are true:
The control module(s) can communicate via the serial data link.
2. Review the system operation in order to familiarize yourself with the system functions. Refer to the
following system descriptions:
Power Windows Description and Operation
Power Door Locks Description and Operation
Door Ajar Indicator Description and Operation
Outside Mirror Description and Operation (Power Mirrors) or Outside Mirror Description
and Operation (Heated Mirrors) or Outside Mirror Description and Operation (Auto Day —
Night Mirrors)
Visual/Physical Inspection
Inspect for aftermarket devices which could affect the operation of the power door lock, power window
and power mirror systems]. Refer to Checking Aftermarket Accessories in Wiring Systems.
Inspect the easily accessible or visible system components for obvious damage or conditions which could
cause the symptom.
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for
Intermittent Conditions and Poor Connections in Wiring Systems.
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
Power Windows Inoperative — Express Down Function
Power Windows Inoperative — Lockout Function
Power Window Inoperative — Driver Door
Power Window Inoperative — Passenger Door (Front Door) or Power Window Inoperative —
Passenger Door (Rear Door(s))
Door Ajar Indicator Malfunction
IMPORTANT: The following steps must be completed before using the symptom tables.
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2