Hummer H2. Manual — part 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.
Does the DTC reset?
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
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Hummer H2. Manual — part 437
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.
Does the DTC reset?
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
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Replace a Fuse: 2006-2010 Hummer H3
1. Getting Started — Prepare for the repair
2. Open the Hood — How to pop the hood and prop it open
3. Remove Cover — Locate engine fuse box and remove cover
4. Locate Bad Fuse — Find the fuse that is tied to the bad component
5. Remove Fuse — Take out the fuse in question and assess if blown
6. Replace Cover — Secure the cover and test component
7. More Info. — Additional information on engine fuses
Lake Chevy helped make these videos
If your convenience lights, turn signals, seat warmers, stereo, headlights or other electronic components suddenly stop working, chances are you have a fuse that has blown out. The video above shows how to check and change blown fuses in the engine bay of your 2008 Hummer H3 in addition to where the fuse box diagram is located. Fuses should always be the first thing you check if your H3 is experiencing electrical difficulties because they are relatively easy and inexpensive to change yourself. The more electronics your H3 has, the more fuses it has. Some Hummers have multiple fuse boxes in the engine bay, so be sure to find the fuse(s) in question. Some components may have multiple fuses, so make sure you check all of the fuses that are linked to the component that is no longer working properly.
If you need to replace a blown fuse in your H3, make sure you replace it with one that has the same amperage as the blown fuse. If checking and replacing the fuse for the component in question doesn’t work, we recommend seeking assistance from a trusted professional mechanic. They should be able to figure out if the component needs to be replaced or if there is a short or some other problem with your H3.
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Hans Angermeier has produced over 100,000 videos showing drivers how to fix things on their cars. He has broad expertise on basic repair procedures covering the majority of cars on the road.
Flushing the coolant in your car is not that hard and will extend the life of your engine tremendously — learn how here!
Learning how to jump your car before you need to is an excellent idea
Stop! Checking your brake fluid from time to time is a great way to ensure safe stopping
Help keep your car as responsive as you are by maintaining proper power steering fluid levels
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Our system selects the most applicable video for your car based, in part, on these characteristics. The video displayed may not look exactly like your car, but may be relevant enough for you to get a good idea how to do it.
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Hummer H2. Manual — part 555
voltage to the power window motor through the power window motor down circuit. Since the opposite side of
the motor is connected to the normally closed contacts of the up relay to ground through the power window
motor up circuit, the window moves down. If a rear power window switch is placed in the up position, the up
relay would energize and allow battery voltage to the power window motor through the power window motor
up circuit. Since the opposite side of the motor is connected to the normally closed contacts of the down relay to
ground through the power window motor down circuit, the window moves up.
The rear passenger power windows can also be controlled from the power window master switch. The power
window master switches for the rear passenger power windows have two positions UP and Down and its
position is a direct input into the DDM. Upon receiving a request for rear passenger power window operation
(switch activation), the DDM transmits a Class 2 message indicating the changed switch position. When the
BCM receives this message, the BCM can control the rear window up and down relays.
Express Down Operation
The express down function controls both the driver and front passenger power windows but only from the
driver door power window master switch. When either the driver or front passenger window switch is
momentarily depressed to the express down position, it is a direct input into the DDM. If the request was for the
driver power window, the DDM supplies voltage to the power window down circuit continuously until the
power window reaches the bottom of its travel. At this point, the DDM senses an over current situation on the
power window down circuit and interrupts the voltage supply. If the request was for the front passenger power
window, the DDM transmits a Class 2 message indicating an express down function was requested. When the
PDM receives this message, the PDM supplies voltage to the power window down circuit continuously until the
power window reaches the bottom of its travel. At this point, the PDM senses an over current situation on the
power window down circuit and interrupts the voltage supply.
Power Window Lockout Operation
The DDM contains a window lockout switch that is responsible for the disabling of all the passenger windows
from the individual passenger window switches. When the window lockout switch is activated, the DDM
transmits a Class 2 message indicating that a window lockout request has been received. When the PDM
receives this message, it will disable the power window motor up and down circuits. When the BCM receives
this message, it will interrupt the up and down relay coil feed voltage for both rear doors. Once activated, the
lockout feature will remain in effect until the ignition switch is cycled or the DDM receives another power
window lockout switch activation.
POWER DOOR LOCKS DESCRIPTION AND OPERATION
Door Lock System Components
The power door lock system consists of the following components:
Источник
Hummer H2. Manual — part 690
The rear door lock switch
The door lock relay
The door unlock relay
The liftgate lock relay-utility vehicles with liftgate only
The reversible door lock actuators in each of the doors and liftgate
LOCKS 20A fuse (rear lock/unlock relay supply voltage)
ECC 10A fuse (liftgate lock relay supply voltage)
Door Lock System Controls
The power door lock system can be controlled by any of the following:
A power door lock or unlock switch activation
A keyless entry transmission
An automatic door lock function
A delay lock function
Door lock cylinder switch activation
An airbag deployment
Driver, Passenger and Cargo Door Lock System Operation
The front power door lock switches are integral components of the driver door module (DDM) and passenger
door module (PDM). The switches are two position normally open rocker switches. When placed in either the
lock or unlock positions, the switches provide a direct input to the DDM or PDM. The DDM or PDM monitors
these inputs and sends a Class 2 message indicating a change in the switch’s respective position. Modules which
activate the power door lock motors receive the Class 2 message and activate the motor in the appropriate
direction to lock or unlock the vehicle’s doors and liftgate. The rear door lock switch provides a lock and unlock
signal to the body control module (BCM). The BCM upon receipt of a lock or unlock signal will control the rear
door lock relays and also send a Class 2 message to the DDM and PDM to perform the appropriate function.
The modules which activate the power lock motors are:
The DDM (driver door lock actuator).
The PDM (passenger front door lock actuator).
The BCM (both rear door lock actuators and cargo door/liftgate).
The DDM and PDM are directly connected to the respective door lock actuator through the door lock motor
lock and unlock circuits. Once a door lock or unlock request has been received, the module will supply battery
voltage to one side of the actuator and ground the other causing the doors to lock or unlock.
The rear passenger and cargo doors differ slightly in that they use lock and unlock relays. The relays supply and
coil sides receive a constant voltage through the battery voltage supply circuit. The normally closed contacts are
2004 ACCESSORIES & EQUIPMENT Doors — Hummer H2
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