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body control module
Joined: Nov 2003
Posts: 11,329
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
The BCM controls the keyless entry system, content theft deterrent system (alarm), vehicle theft deterrent system (VATS), audible warnings and chimes, retained accessory power (RAP), power door locks, hatch release, and the interior courtesy lights.
Joined: Nov 2003
Posts: 11,329
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
Yes, but the service manual lists it using the generic "vehicle theft deterrent" followed by the GM corporate-speak version (VATS) so I just followed their lead. I knew when I typed it that somebody would point out that the acronym didn't match - thank you for meeting my expectations. 
Thread Starter
Joined: Jun 2005
Posts: 4,641
Likes: 392
From: cookeville, TN
is there a way to bypass the bcm so that it retains keyless entry funtions hatch and couresy lamps
maybe i should explain the car was a v6 car and the ls1 now runs off of a stand alone harness and basically the bcm is in my way and i would just remove it if i knew what it controlled. your telling me if i remove it i figured keyless entry was out, but the door locks and hatch is that just the keyless entry side of will the switches in the car no longer work if they are removed? what is (rap)
maybe i should explain the car was a v6 car and the ls1 now runs off of a stand alone harness and basically the bcm is in my way and i would just remove it if i knew what it controlled. your telling me if i remove it i figured keyless entry was out, but the door locks and hatch is that just the keyless entry side of will the switches in the car no longer work if they are removed? what is (rap)
Joined: Nov 2003
Posts: 11,329
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
The BCM actually controls the door locks - without it the switches wouldn't do anything. The same applies to the hatch release although that would be a little easier to work around.
RAP is Retained Accessory Power - the function where the radio and windows will still have power for about 10 minutes after shutting off the ignition or until a door is opened. You could bypass that but you would have to rewire the power for the windows and radio.
There is no way to bypass the BCM while retaining keyless entry since the receiver is built into the BCM. The courtesy lights could be rewired but it would take some doing since the door switches only signal the BCM to turn on the lights - they don't directly control the lights like they used to in older models.
RAP is Retained Accessory Power - the function where the radio and windows will still have power for about 10 minutes after shutting off the ignition or until a door is opened. You could bypass that but you would have to rewire the power for the windows and radio.
There is no way to bypass the BCM while retaining keyless entry since the receiver is built into the BCM. The courtesy lights could be rewired but it would take some doing since the door switches only signal the BCM to turn on the lights - they don't directly control the lights like they used to in older models.
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to open up a semi-old thread. I want to tie my radar into the reading lights on the rearview mirror. With the BCM holding power to that item using the RAP, should i worry about it killing my battery? Once i turn off the car and open the door, close it, and lock the car there shouldnt be any power to the radar right?
Joined: Nov 2003
Posts: 11,329
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)
to open up a semi-old thread. I want to tie my radar into the reading lights on the rearview mirror. With the BCM holding power to that item using the RAP, should i worry about it killing my battery? Once i turn off the car and open the door, close it, and lock the car there shouldnt be any power to the radar right?
Why not just take a few minutes and run an ignition-controlled power wire (say, from the IGN port in the fuse panel) up the A pillar and across under the headliner?
Joined: Nov 2003
Posts: 11,329
Likes: 346
From: Jacksonville, FL (originally from Toronto Canada)