BCM location and replacement?

Tiny
BENJAMINTHERERRIBLE
  • MEMBER
  • 2009 CHEVROLET IMPALA
  • 3.9L
  • V6
  • 2WD
  • AUTOMATIC
  • 110,000 MILES
There's a green connector that plugs into the BCM. What is pin 26 for can I replace it myself?
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Monday, July 27th, 2020 AT 8:07 AM

40 Replies

Tiny
AL514
  • EXPERT
Hello, it looks like pin #26 is the floor shifter going to the BCM, having to do with the shift lock controls. It looks like it's a green/white wire. You can verify by wiring color. I have also included how to replace the BCM. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.
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Monday, July 27th, 2020 AT 8:49 AM
Tiny
2CARPROS-ARCHIVES
  • MEMBER
  • 2008 CHEVROLET IMPALA
  • 98,000 MILES
WHERE IS THE BODY CONTROL MODULE LOCATED
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Tuesday, August 25th, 2020 AT 5:43 PM (Merged)
Tiny
ASEMASTER6371
  • EXPERT
Under the dash just to the left of the steering column.

Roy
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
STACY BINGHAM
  • MEMBER
  • 2007 CHEVROLET IMPALA
  • 150,000 MILES
Car has a electrical drain of seven volts. Did standard test. Pulled fuses out and three are connected. Display, interior, and BCM. Could the culprit be the BCM?
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
WRENCHER1
  • MEMBER
Electrical drains are not measured in volts. Voltage is pressure, not quantity.

Here is how you measure for a parasitic drain.

You will need a digital ammeter and a jumper wire with clips on the ends to do this.
First rig any door switches so you can have a door open without triggering the interior lights and unplug the hood light. Remove one battery cable and attach the meter in series between the battery cable and battery post. Take the jumper wire and also attach it the same way. Leave the jumper wire on for at least 10 minutes to expire all the automatic timers. Now remove the jumper wire and read the meter. Anything over 50ma is too much draw. The way you locate this is to start removing fuses one at a time until the meter drops to normal level. This will be the circuit with something staying on. Determine what components are part of that circuit and check them individually until the problem is isolated.
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
STACY BINGHAM
  • MEMBER
Yes I did that with my doom. With the bcm and the displace fuse removed I get 52 mill amps. But when I put the fuse back in I get 7.75
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
WRENCHER1
  • MEMBER
When you put it back in you are restarting all those timers again so you have to wait after plugging it in to see the real reading.
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
USA007
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 44,000 MILES
I just received the new bcm and the gm connector 25777448 today. Anyone familiar with installing the connector? The instructions don't mention what to do with the black wire.
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
HMAC300
  • EXPERT
There are a couple of specialtools to remove these but normally you can use a pic type tool to get in to release them. There are 7 different bcm's I coul d send a chart if yo uhave the oem part number
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
USA007
  • MEMBER
The connector I'm referring to is use to prevent electrical spikes from damaging the bcm
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
HMAC300
  • EXPERT
Ok we have no info on that and i've never done one sorry
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
BLOCKERD
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • AUTOMATIC
  • 40 MILES
I took my car to shop to repair a oil pressure light, and he repalced the sensor, but as he unplugged the battery he said that the BCM blowed, and he had to replace that and have the car towed to reprogram the computer, and all is at my expense.
Is this to be expected each time you change the BCM?
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
JOHNNYT73
  • EXPERT
If he admitted that he was the one that "blew" the BCM. Then why is it at your expense to pay for it? He should be paying for it if he was at fault. It does usually need programming by the dealer.
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
BLOCKERD
  • MEMBER
The mechanic is not taking the blame, he said that he had to disconnect the battery to do the job, and no matter who had disconnected the battery then the BCM would have blown out anyway.
Is this true?
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
JOHNNYT73
  • EXPERT
That is in no way true. My guessing is that something else happened to cause the issue. In GM vehicles I have seen where doing such things can cause cluster issues, but thats mostly in the trucks.
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Tuesday, August 25th, 2020 AT 5:44 PM (Merged)
Tiny
PRECIOUS2010
  • MEMBER
  • 2006 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 57,000 MILES
My name is maria and I own a 2006 chevy impala and my bcm went bad and it wouldnt start so I took it to my mechanic and he installed the used bcm from another 2006 chevy impala with the same part # and it starts but the now the radio doesnt play and the service airbag and service engine light and im just wondering if the used bcm that I purchased can it be reprogrammed to my car without buying a new bcm.
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Tuesday, August 25th, 2020 AT 5:45 PM (Merged)
Tiny
BRIAN 1
  • MEMBER
The bcm has to be set up with a tech 2, you have to set the bpp sensor and restraint id. Usually once the bcm is programmed it becomes locked and normally cannot be programed to the vin of your car, plus you have to get a bcm with the same options and engine size.I would have it scanned for the codes and see it it can even be set up.
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Tuesday, August 25th, 2020 AT 5:45 PM (Merged)
Tiny
ORAN0007
  • MEMBER
  • 2004 CHEVROLET IMPALA
Electrical problem 6 cyl Two Wheel Drive Automatic 120000 miles

My 2004 Impala will not start. I have replaced the starter and starter relay. I have found references to bad terminals on the body control module. I cannot find this part in my repair manual. Where is it located on the car? Also, is it something I should try to check myself, or should I take it to a mechanic? When I turn the key, there is no cranking, even with a brand new starter. I read that sometimes the terminals on the BCM corrode, and can cause this.

I don't need to check for fuel or spark until I can get it to crank right? Hopefully I will be able to fix it this weekend.
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Tuesday, August 25th, 2020 AT 5:45 PM (Merged)
Tiny
KEN
  • ADMIN
Your BCM is located on the left hand side of the steering column.

If you want to replace the BCM, you will have to have the new BCM programmed at a chevy dealer. You can't do it yourself. Once it is programmed though it's only a matter of swapping the BCM.
However, before you spend money on that, make sure your problem is not elsewhere.

Does your car crank or is it silent when you turn the key?
Is your security light on?
If your car cranks, have you checked for sparks and fuel?

Here is a guide that can help you

https://www.2carpros.com/articles/car-cranks-but-wont-start

Before you can check for a fuel or spark related issue you first need the car to crank.
I forgot to ask, but you checked your battery to make sure it was good and the cables were clean and tight right?

If you replace the starter and starter solenoid, but the car still doesn't crank at all, I'm thinking your problem is either a bad ignition switch, park safety switch, or brake pedal safety switch.

Check for voltage at the solenoid; if you get 0, suspect one of the problem mentioned above.

Please run some tests and get back to us so we can continue helping you.

Best, Ken
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Tuesday, August 25th, 2020 AT 5:45 PM (Merged)
Tiny
JMDALLAS22@BELLSOUTH.NET
  • MEMBER
  • 2003 CHEVROLET IMPALA
Electrical problem
2003 Chevy Impala 6 cyl Front Wheel Drive Automatic

where is the body control module located
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Tuesday, August 25th, 2020 AT 5:45 PM (Merged)

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