Body control module wiring diagrams and pin out?

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?

7 Replies

KEN L

MASTER CERTIFIED MECHANIC
43,081 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

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)

STEVE W.

MECHANIC
13,018 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)

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)

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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