Where is the BCM on a 2004 Malibu Maxx?

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Question moved to model category.

Jeff our Automotive electronic expert provides the answer

Jeff Armer
Jan 28, 2024
Body Control Module (BCM)
Below the left side of the I/P, left of the steering column

and some more information from me

Your vehicles body control module is located under the dash on the drivers side of the vehicle.
Jan 10, 2011

Where is the body control module located on a 2004 pontiac ...

https://www.google.com/search?q=2006+pontiac+grand+prix+body+control+module+location

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Is the vehicle security light lit ? It could be a fuse or the starter relay , or even the ignition switch , or even the PNP - park neutral position switch . This is a complex electronic starting system , computer controlled . The ignition switch is a low voltage input to the the BCM - body control module . When the BCM receives this input to crank the engine a lot of complex commands are sent over the serial data network to the PCM to enegrize the starter relay , there by sending battery voltage to the S terminal on the starter solenoid . If your mechanic disconnected the battery it could have caused the radio to say locked , you need a code to enter into the radio to unlock it , may need to have the dealer hook up their factory scan tool to do that .
Your best bet , find a better automotive technician , not a mechanic.
Circuit Description (Key Start)
For ignition switch power modes refer to Body Control System Description and Operation in Computer/Integrating Systems. Once the ignition is placed in the Run/Crank position, the control circuit of the Run/Crank relay is grounded by the body control module (BCM). With the Run/Crank relay switch closed, battery positive voltage flows through it and on to the park/neutral position (PNP) switch. With the PNP switch in either the Park or Neutral position, battery positive voltage will flow to the starter relay coil supply voltage input terminal of the powertrain control module and the coil side of the starter relay. Placing the ignition in the START position sends a message to the powertrain control module (PCM) requesting engine start. If the PCM has determined that the transmission is in Park or Neutral and theft is not active, it will ground the control circuit of the starter relay. Battery positive voltage will then flow through the switch side of the starter relay to the S terminal of the starter solenoid, cranking the engine.

Why did it catch fire ? what did you hook up wrong ? Ignition switch is a input to the BCM - body control module , before you fry the BCM ,do yourself a favor an take it to a qualified repair shop.

https://www.google.com/search?q=I+need+to+know+which+wire+goes+with+each+place+in+a+fuse+compartment+for+a+Ford+Taurus+2005&biw=1360&bih=650&tbm=isch&tbo=u&source=univ&sa=X&ved=0ahUKEwiOmqv0o6XQAhXINSYKHQ1TBgoQsAQIGg#tbm=isch&q=Cig+lighter%2Caux+pow+fuse+location+Chevy+Malibu+Maxx+2004

Hope this helps

If the wrench light is lit you need to have a factory scan tool hooked up , check for DTC'S - diagnostic trouble codes >
The body control module (BCM) detects certain malfunctions that are not emissions related. The IPC receives a GMLAN message requesting illumination from the BCM.

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The IPC detects a loss of GMLAN communications with the BCM.

Also have cooling system pressure tested , this is the only way to check for leaks .

to the right of the shifter

You would have to change the heater case to accept the electric motors splice in the wiring ,rplace the controls,and maybe the body control module I am not 100% sure on the body control module.

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 .

check all fuses, but you may have a body control module, problem such as connection corrosion