Question about 2004 Chevrolet Malibu

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04 Malibu power locks up and down all the time, even w/key off. I've been told that keyless entry modulator is bad but somebody also told me that BCM is part of the keyless entry. Someone help me please.

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  • lolp9911 May 13, 2009

    This car was flooded and I've been told that BCM (GM # 15234845) is part of the keyless entry (by the way the remote doesn't work) but when I tried to order the part the dealer told me that the part I need is a keyless entry fobs and batterys module (GM # 15835548). So I'm really confused which part is the right one. I wish I could get one of those scanner tools but I don't know which one. What do you recommend? And also, I've been looking for wiring diagrams that show all the electical components . I have the Haynes repair manual but it doesn't show me the keyless module or location of mudules in the car. Thank you for all your help.

  • lolp9911 May 13, 2009

    It was flooded up to the bottoms of the seats. I have Malibu LT 4 door. Yes would you please email me the schematics. I really appreciate your help.

  • lolp9911 May 13, 2009


    Thank you very much for all of your help. This is my email lolp9911@yahoo.com if you could please send me the schematics I would appreciate it very much. Thanks again.

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  • 253 Answers

The remote control door lock reciever controls the door locks, and tire pressure monitor. If your TPM and remote work normaly then it will not be the RCDLR. The body mudule is involved but I don't see this problem being related to it. About a week ago I had a car like yours with a small short in a door causing this exact issue. You need to get it scaned for body codes to give you a better idea where to go. Let me know if you need moer help. I have looked on the GM service web site and there are no known issues related to this. Good Luck.

Posted on May 13, 2009

  • Mike White
    Mike White May 13, 2009

    Ok the flooded tells me alot. I can get all those schematics and info for you, but I can not post a link to them. How bad was it flooded? There are two bodys, sedan and extended sedan(malibu max). If you have the regular malibu then the door lock reciever is in the trunk under the back window. If you have the max then it is in a panel beside the rear seat. If the water did not get that deep, I would lean towards the body module. It is in the console on the right side behind a panel. It has a fuse block built into it. I can e-mail you schematics, but I am not supposed to (publish them) . Let me know.

  • Mike White
    Mike White May 13, 2009

    It will be more than likley the BCM, Provide me your e-mail and I will send them to you. Mine is mechanic mikexx@aol.com

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1 Answer

1999 blazer Doors lock and unlock even when parked, help


Lock an unlock by them selves ? Door locks are computer controlled ,by the BCM - body control module .
--------------------------------------------------------------------------------
Power Door Locks Circuit Description
The power door lock system includes the following components:
• The door lock actuators
• A door lock relay
• An door unlock relay
• A driver door unlock relay
• The door lock and side window switches
• The body control module (BCM)
• The endgate lock cylinder switch /liftgate lock cylinder switch (utility)
• The keyless entry, if equipped
The door lock and liftgate mechanisms may be controlled by the following switches:
• The door lock and side window switches
• The BCM
• The endgate lock cylinder switch / liftgate lock cylinder switch (utility)
• The keyless entry, if equipped
The following locking functions are included on the vehicle:
• All the doors unlock -- All the doors will unlock, including the endgate/liftgate, when any power door unlock switch is detected. The passenger doors lock directly by pressing the lock switches. The driver door unlocks by the BCM using a driver door unlock relay.
• All the doors lock -- All the doors will lock, including the endgate/liftgate, when any power door lock switch is activated. All the lock actuators will activate directly from the power door lock switch (external to the BCM).
• The end/lift gate lock switch -- All the doors will lock or unlock from the end/lift gate lock switch.
• The lockout prevention -- This function will prevent the doors from automatically locking if the keys have been left in the ignition and the power door lock switch is operated.
The motor is protected by a built-in electronic circuit breaker (ECB). If the motor is overloaded or voltage is applied for an excessive amount of time, the ECB internal resistance increases, essentially creating an open circuit. The resistance returns to normal only after voltage is removed from the circuit, thereby restoring circuit continuity.

You have a bad switch input to the BCM !
Door lock acting up 2005 Chevy Malibu fix it here
Door Locks Go Crazy 2

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2 Answers

My Buick 2004 rendevous,my door ajar light stays on and it dings, and the locks, lock and unlock a the while when driving


Probably the switch input to the BCM is bad . door ajar switch .
The BCM is also capable of commanding other vehicle systems to control functions that are not directly wired to and/or controlled by the BCM. The BCM accomplishes this task by sending specific messages on the class 2 serial data link. The vehicle system capable of performing such function will respond to the BCM message.
The BCM controls/monitors the following functions:
• Audible warnings
• Indicators control
• Interior lighting
• Exterior lighting
• Power/automatic door locks
• Keyless entry
• Content theft deterrent
• Personalization
• Serial Power Modes
• Electrical Power Management

Audible Warning
The body control module (BCM) provides the following audible control functions. Some audible control functions may be controlled by other systems through the class 2 serial data link:
• Headlamp on reminder
• Key in ignition reminder
• Personalization mode
• Delay locking indication
• Keyless entry programming/diagnostic mode indication

Indicator Control
The body control module (BCM) provides the following indicator control functions through the class 2 serial data circuits. Some indicator control functions may be controlled by other systems through the class 2 serial data link:
• Door ajar
• Liftglass/endgate ajar
• Park brake
• High beam
• Park lamp malfunction
• Service vehicle soon
• Personalization mode
• Security LED
• Battery

Door Locks Go Crazy 1
Door Locks Go Crazy 2
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1 Answer

How do I know if my 2005 Pontiac Sunfire has a keyless entry? It has power locks but the dealer I got it from only gave me a single key.


Dealer , the keyless entry is controlled by the BCM - body control module . Hooking up a factory scan tool an looking at BCM data to see if keyless entry is enabled (turned on )

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1 Answer

BCM CONTROLS WHAT IN CHEVY MALIBU 2001 DOES IT CONTROL ANTITHEFT SYSTEM GAUAGECLUSTER HAVING ISSUES WITH BOTH THANKS


yes

Body Control Module Circuits
  • The BCM controls or monitors the following circuits: the A/C compressor request, A/C cooling fan, battery rundown protection, bulb check of the instrument cluster, chimes, oil life monitoring, power door locks, horn, instrument cluster, interior and exterior lighting, ignition key sensing, parking brake sensing, anti-theft systems, retained accessory power, rear defogger, remote keyless entry, seat belt sensing and the wiper/washer systems.

  • on your vehicle it is a known problem and caused by a bad connector.


BCM CONTROLS WHAT IN CHEVY MALIBU Google Search

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1 Answer

Why doesn't the horn beep when i lock my doors with the remote on my 03 malibu is it a bad relay


When you push the horn switch (button) on the steering wheel ,do the horns work then ? The BCM - body control module energizes the horn relay for keyless entry operation . Start by having BCM checked for DTC'S - diagnostic trouble codes .

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1 Answer

2004 chevy malibu driver and passenger door lock problems


The locks on your vehicle are electronically controlled by the BCM - body control module . The driver an passenger door switche's are input's to the BCM . Do you know anything about automotive electronic's ? anti theft alarm remote, could this be part of the problem , No it's just a key less entry remote , nothing to do with the anti-theft .
Door Lock System Components
The Power Door Lock System consists of the following components:
• Body control module (BCM)
• Driver door lock switch
• Front passenger door lock switch
• Door lock actuators in each of the doors
• IBCM (PWR) 15-amp fuse

Door Lock System Controls
The Power Door Lock System is controlled by the body control module (BCM) and can be activated by any one of the following:
• A door lock switch Lock or Unlock actuation
• A keyless entry transmitter actuation
• An automatic door lock actuation
• An automatic door unlock actuation
• A last door closed locking (LDCL) actuation

Driver and Passenger Door Unlock Operation w/o Keyless Entry
When the body control module (BCM) detects a transition of either of the door lock switches to the Unlock position, it switches the door lock actuator unlock control circuits to voltage. Since the door lock actuator lock control circuit is at ground potential within the BCM, the driver passenger door lock actuators transition to the Unlock position.

Your best bet , take your vehicle to a qualified repair shop ! Need special tool to diagnose .

Power Door Locks Inoperative

Install a scan tool.
Turn ON the ignition, with the engine OFF.
With a scan tool, observe the door lock switch parameter in the Doors data list.
Does the scan tool display Idle?
YES - Go to Step 4
NO - Go to Step 8
4
Activate the driver door lock switch to the LOCK and UNLOCK positions.
Does the scan tool display Idle?
YES - Go to Step 9
NO - Go to Step 5
5
Activate the front passenger door lock switch to the LOCK and UNLOCK positions.
Does the scan tool display Idle?
YES - Go to Step 9
NO - Go to Step 6
6
With a scan tool, observe the driver door lock actuator command and the passenger door lock actuator command parameters in the Doors data list.
Activate a door lock switch to the LOCK and UNLOCK positions.

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1 Answer

Where is BCM located on 2002 PT Cruiser locks working even when car is not on have been told to check BCM don't know where to find it


I don't find a body control module for your car, but according to the wiring diagram the door locks are controlled by a keyless entry module which is located on top of the dash behind the ac vents.
There are three fuses that power the module.
Check with your dealer for more details.

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1 Answer

2008 HHR Remote Starter not working


Is this an issue with all 2008 HHR remotes??? Highly doubtful , probably the vehicles keyless entry system . Taking the vehicle to a qualified repair shop an having the keyless entry system checked for DTC'S - diagnostic trouble code's . Do you know what a DTC is ?
The keyless entry system is a vehicle entry device. The keyless entry system is used in conjunction with the body control module (BCM) to remotely activate certain vehicle features. Keyless entry will lock/unlock the doors, or release the rear compartment lid when a corresponding button on the keyless entry transmitter is pressed. This is accomplished by the transmitter sending a radio frequency to the remote control door lock receiver (RCDLR). The RCDLR interprets the signal and activates the requested function via a serial data message to the BCM. A low transmitter or vehicle battery or radio frequency (RF) interference from aftermarket devices, such as 2-way radios, power inverters, computers, etc., may cause a system malfunction. High RF traffic areas may also cause interference that could lead to a malfunction. Keyless entry allows you to operate the following components:
• Door locks
• Liftgate lock
• Remote rear doors (Panel only)
• Vehicle locator/panic alarm
• Illuminated entry lamps
• Remote vehicle start
The keyless entry system has the following components:
• Keyless entry transmitters
• Keyless entry antenna
• 2 Way Advanced Remote Start RCDLR
• BCM

Guessing will not fix this .

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Did you have the vehicle's control module system checked for DTC'S - diagnostic trouble code's ??????? Specifically the SJB - smart junction box , ford's BCM - body control module . Does the remote start/keyless entry still work ? Adding after maket system's to vehicle's (even your year ) isn't all ways a good ideal . It can cause major problems ! Having a qualified professional automotive technician check it out would be a good idea. Who installed these aftermarket systems ? Some of these place's have no idea what they are hooking to , any old place they can find B+ power .

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1 Answer

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Remote control door lock reciver an the BCM - body control module control the locks . The key switch is a electrical input to the BCM , the BCM controls the door lock actuators . Your best bet ,have it towed to the dealer .

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