Body control module wiring diagrams and pin out?

Tiny
GOLFLION49
  • MEMBER
  • 2003 CHEVROLET SILVERADO
Key fob door lock/unlock will not work. Passenger door will not auto lock or unlock. Passenger door window will not work. Normally the radio will play for a few minutes after I turn off the key. Now it shuts off when I turn off the key. Where is the body control module?
Wednesday, August 18th, 2010 AT 8:35 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Hello,

This problem could be the BCM which is located under the dash on the drivers side. But I would start by checking 5 fuses that could be causing the problem as well. IF the fuses are good the BCM is probably bad which you can replace but it may need to be programmed to work correctly.

Here some guides and diagrams to help you get the problem fixed.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-wiring

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

Cheers, Ken

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Monday, April 13th, 2020 AT 6:22 PM
Tiny
LOUD PELLETIER
  • MEMBER
  • 39 POSTS
  • 2003 CHEVROLET SILVERADO
  • 8.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
I would like to have the BCM pinout diagram for the truck listed above lt and if possible the pinout of accessoire in the cabin too. Lt example: power windows, door lock, radio, heated seat etc. But especially the BCM.
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Thursday, May 13th, 2021 AT 8:14 PM (Merged)
Tiny
STEVE W.
  • MECHANIC
  • 15,233 POSTS
Here are the BCM connectors and the systems they deal with. Also the wiring diagram for the BCM. For the others if you could tell us if it's a regular or crew cab and 2500 or 3500 it would narrow down the items you need. Also could you say what you are doing or if you have a problem? It sort of sounds like you are doing some swap work or a rewire. Thank you.
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Thursday, May 13th, 2021 AT 8:14 PM (Merged)
Tiny
LOUD PELLETIER
  • MEMBER
  • 39 POSTS
  • 2003 CHEVROLET SILVERADO
  • 8.1L
  • V8
  • 4WD
  • AUTOMATIC
  • 160,000 MILES
I would like to have the bcm pinout diagram if possible the pinout of accessoire in the cabin example: power windows, door lock, radio, heated seat etc. But especially the bcm.
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Thursday, May 13th, 2021 AT 8:15 PM (Merged)
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Please see the information attached. This is the wiring diagrams and pinout for the BCM and accessories. Please let us know if you need other info and we can go from there.

Thanks
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Thursday, May 13th, 2021 AT 8:15 PM (Merged)
Tiny
TAWAS23
  • MEMBER
  • 35 POSTS
Wanted to thank you for the help ended up replacing BCM and fixed the issue, thanks again.
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Friday, June 17th, 2022 AT 8:13 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.

Can you please leave us a rating?

https://g.page/r/CZdEnyCkGgm6EB0/review

and

https://www.sitejabber.com/reviews/2carpros.com
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Friday, June 17th, 2022 AT 12:19 PM
Tiny
MANI956
  • MEMBER
  • 4 POSTS
Hey guys! Made a whole account just to ask you guys, I haven't figured out how to set my vehicle, but I wanted to make a bump of this thread, is it possible you guys can give the source for the BCM pictured or pdf where you got them from? I built a little PNG based off the pictures you guys sent so my brain has an easier job reading it, figured out for some reason the viper alarm system of the 06 Silverado I'm working on was for some reason tapped into the tow haul SW SIG on pin b11 connector c3 ( brown ), don't know why, I'm probably going to look it up soon, but either way I'd love it if you guys could source the pdf or document so I can get clear pictures of the wiring so I can keep it for future references.
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Monday, January 13th, 2025 AT 5:52 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
I would remove the viper alarm; I have had nothing but problems with them. The brown wire is for the running lights. The wiring diagrams you can get from https://my.alldata.com
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Tuesday, January 14th, 2025 AT 10:26 AM
Tiny
ASHTON TAYLOR
  • MEMBER
  • 2 POSTS
I found it on Google the whole factory service manual for free I promise no joke not a freaking scam charm. It has service manuals for free.
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Sunday, May 18th, 2025 AT 11:40 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Nice work, I will let people know :)
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Sunday, May 18th, 2025 AT 6:04 PM

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