Hi I'm a newbie,
and a electronic tech at a TV repair business for 35 years
I purchased this car a few months ago for my daughter's first car
94 Concorde 68,000 miles
First the auto a/c,heat would come on high in defrost and could not turn off or select any other function. I remove the a/c,heat control unit and inspected it.
The fan speed control seemed funny when twisted back and forth. I sprayed it with electrical contact cleaner and the other controls reassembled it and it worked fine for two weeks. Then one morning I started it and the wipers, fuel gauge, door locks stopped working at the same time.
The a/c, heat will turn on and off manually but only blows on defrost.
The door locks work with the remote but not with the door switches.
The wipers will work if I press the washer but not hi/lo or intermittent.
The fuel gauge stays at empty, and I noticed a few days ago the cruise control is also not working.
I have checked all fuses and relays, even swapped the relays under the hood and on drivers side dash.
I have a Haynes manual which suck's as far as wiring details, but it looks like everything is common to the Body Control Module.
I have removed and checked for faulty or corroded connections to the pc board, tested a few items I recognized and of course disconnected the battery and still no change.

I can get a refurbished BCM through Autozone for $190.00 but would like to know if this is going to fix it and is there any programming that should be done to the replacement BCM or is it just replace and drive on.

The BCM in car has three connectors.

Please Advise
Thanks
supertek57@hotmail.com

 

Ok, as an electronics expert, would you just throw a high $ part at it without appropriate testing (ie using a real scanner?) It if it was me, I'd get out a schematic and pin point the wiring such as power to the BCM.

This personally happened to me. An intrepid came in with identical problems. The owner tossed in a new heater control head unit, new bcm, new door lock switches and new multifunction switch. none of them fixed the problem, so the car comes to me. First thing I do is check power at the fuses (I don't bother pulling them and checking, I just probe them. What I found is one of the ignition related fuse had less than 1v when it should have had power. When I pulled the fuse and probed the hot side I had 12v but when I installed the fuse I had less than 1 v on the same socket.

Without giving the answer, what do you think was the problem? (hint, fuse is between the ignition switch and the load).

 

Well I would suspect a short in the ignition wiring but it should have blown the fuse with a 11 volt drop or the fuse was incorrect value.
But yes I did check across all fuse holders and continuaty of fuses
I don't have a scanner for this vehicle and it does not use OBDII which I do have

What I was looking for was a step in direction as to where to look for a possible open "fusable link", and someone maybe could send me a decent wiring diagram
I did not want to spend the $190 for a BCM if not needed nor $50+ on a manual.
I bartered for the car and spent $250 just to get it to pass inspection
I don't want to invest a lot in this vehicle I would rather replace it with a newer car

Thanks for the post
supertek57

 

Probably a dead relay in the fuse box under the hood.

 

Well considering I had EXACTLY the same issue now with a 94 Concorde in 2024, 30 years after I purchased the car. I saw your response to it and followed through. I never saw what you saw, all the voltages came out 12 Volts, all the fuses were good, and only those items that were mentioned above were not working, I could as he could use my remote key to open and lock doors, but as stated, the door looks did not work nor did the wipers. Anyway, after seeing your response, I thought ok, lets go through this and found no issues with shorts or the wiring / fuses. I proceeded at that point to remove the knee kick cover and got to the BCM. Once I removed the BCM from the vehicle, I than opened that up and used a magnifying glass and found three electrical lines on the board to be fried and totally opened to their connections. So you did not need to be a donkey and not say what you find other than the hint. I still have no idea what you found, because obviously, my issue even though the same as your issue was not caused by the same problem. Replaced BCM and all is good now!! I did not feel like trying to find the component that caused the lines to fry, but what ever caused it, it was worth just getting a BCM from another vehicle that was junked. Thanks for NOTHING.

 

@YnowandYnot Do you realize the post you are complaining about is over 14 years old?

 

I am aware of it and why I specified how many years have passed since I purchased the car. I happened on it when I googled the issues I had and I saw the post. Thought it nuts that the guy just gives hints, especially considering that his hint was right for him, but wrong for others.