Confirming questions about BCM replacement
Confirming questions about BCM replacement After doing some researching and searching threads here, I've seen that birds can either have one of the two BCM's...
Part# 9353691 = 'Module, Body Cont' with keyless entry
Part# 9353681 = BCM without keyless entry
My car did not come with any key fob, nor does it have an alarm (unless its disabled), but does have power locks/windows/etc, so I'm assuming I've got the BCM WITHOUT keyless entry.
Upon further research, it looks as I can easily switch the BCM's out, but getting the resistor value to match could be much harder. I've found a few pulled BCM's for cheap around various places...and so comes my question, would I have to match the resistance found in that particular BCM to a new key? Is it possible to flash the BCM to the resistance of my current keys? How should I go about doing this?
Long story short: Looking to add keyless entry, don't have the BCM with keyless entry, need to swap them, what to do about resistance on keys/BCM for VATS?
Part# 9353691 = 'Module, Body Cont' with keyless entry
Part# 9353681 = BCM without keyless entry
My car did not come with any key fob, nor does it have an alarm (unless its disabled), but does have power locks/windows/etc, so I'm assuming I've got the BCM WITHOUT keyless entry.
Upon further research, it looks as I can easily switch the BCM's out, but getting the resistor value to match could be much harder. I've found a few pulled BCM's for cheap around various places...and so comes my question, would I have to match the resistance found in that particular BCM to a new key? Is it possible to flash the BCM to the resistance of my current keys? How should I go about doing this?
Long story short: Looking to add keyless entry, don't have the BCM with keyless entry, need to swap them, what to do about resistance on keys/BCM for VATS?
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Joined: Dec 2001
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From: Jacksonville, FL
Don't know, I'd assume the new BCM would have to be programmed. Does the car have RPO AU0 (remote entry lock control)? If it does thinking all you need is the remote and program it yourself.
GM books state the BCM is only writable once from the factory. My guess would be that you'll have to determine the correct resistance for the new BCM and have a key cut, with the correct resistance to match the BCM and the profile of your existing key.
EDIT: Another option is to simply have VATS tuned out or build a VATS bypass box for a few bucks in hardware.
EDIT: Another option is to simply have VATS tuned out or build a VATS bypass box for a few bucks in hardware.
Last edited by Rhino; Apr 18, 2008 at 03:57 PM.
when you replace the bcm with a factory new bcm it matches itself to the first key used after it gets installed
this is not something you can later change, so if you get a used bcm you will need to figure out the vats resistance,, best would be if you could get the used bcm and key/ign cylinder from the same vehicle
this is not something you can later change, so if you get a used bcm you will need to figure out the vats resistance,, best would be if you could get the used bcm and key/ign cylinder from the same vehicle
when you replace the bcm with a factory new bcm it matches itself to the first key used after it gets installed
this is not something you can later change, so if you get a used bcm you will need to figure out the vats resistance,, best would be if you could get the used bcm and key/ign cylinder from the same vehicle
this is not something you can later change, so if you get a used bcm you will need to figure out the vats resistance,, best would be if you could get the used bcm and key/ign cylinder from the same vehicle
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sure if the key is still in the car,, just bring a good ohm meter with you and measure the resistance of the chip in the key
then have your key re-cut on a key blank with the correct chip or eliminate it and place a resister of the same value in the harness and the base of the steering column
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If you can find a car with bcm and key you can carefully pop the resistor out of the key using a pair of needle nose pliers and then reverse procedure to put the resistor into your key.
Why don't you just install an aftermarket alarm? 2 birds with one stone, and a lot less troublesome.
But as stated above, the key resistance will have to match what is programmed in the bcm. If you knew that resistance, you could just keep your existing key and wire in a couple of resistors to bypass the vats.
But as stated above, the key resistance will have to match what is programmed in the bcm. If you knew that resistance, you could just keep your existing key and wire in a couple of resistors to bypass the vats.
Why don't you just install an aftermarket alarm? 2 birds with one stone, and a lot less troublesome.
But as stated above, the key resistance will have to match what is programmed in the bcm. If you knew that resistance, you could just keep your existing key and wire in a couple of resistors to bypass the vats.
But as stated above, the key resistance will have to match what is programmed in the bcm. If you knew that resistance, you could just keep your existing key and wire in a couple of resistors to bypass the vats.
Nope, as long as you have power locks you are fine. The alarm's brain will act as the voltage triggers for lock and unlock just like the bcm would.
