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Dan
Dan, Technician
Category: Chevy
Satisfied Customers: 23587
Experience:  Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Where is the body control module in a 2002 GMC Sierra

Customer Question

Where is the body control module in a 2002 GMC Sierra 2500HD?
JA: Are you fixing your Sierra 2500HD yourself? What have you tried so far?
Customer: The headlights will not come on automatically, we have replaced the sensor and it is still not working. Yes, we are doing it ourselves
JA: Have you checked the fuses? Have you checked the bulbs?
Customer: The headlights work if you do it manually. We thought we had checked the right fuse, but after looking at all of the forums, I think we are getting kind of deep into the electrical problems. After looking at the fuse map in the manual there seems to be several fuses that deal with the drls
JA: Anything else you want the mechanic to know before I connect you?
Customer: DRL's
Submitted: 6 days ago.
Category: Chevy
Expert:  Dan replied 6 days ago.

Hello, my name is ***** ***** I'm here to help get your problem solved.

Expert:  Dan replied 6 days ago.

Here are replacement instructions, the BCM will need to be reprogrammed with dealer scantool after installing. Let me know if you have more questions, thanks.

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https://www.dropbox.com/s/fx47pzilx93hh3z/bcmrr.pdf?dl=0

Customer: replied 6 days ago.
Do you have any other ideas to try before we take it to the shop?
Expert:  Dan replied 6 days ago.

Only other thing to do would make sure the white wire that goes from Pin A11 of C2 at BCM to headlamp relay is good, if so I agree BCM needs to be replaced. Here is a wiring diagram to help with testing, let me know if you have more questions. Thanks.

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https://www.dropbox.com/s/tjk9vm5nv9jncsj/hlrr.pdf?dl=0