99Z28camaroman

iTrader: (10)

I have spotted someone selling a BCM and keyfob on Ebay for 93-02 Camaro like this picture

Will this give me keyless entry or does the 99Z28 have a seperate keyless entry module like I had on my 95 Z28 like this?

99Z28camaroman

iTrader: (10)

Anyone, Lots of you guys who have keyless entry must have looked behind the passenger kick panel all I am asking is does your 99 Z28 car have a keyless entry reciever like the one picture above?

99Z28camaroman

iTrader: (10)

I have found out from another message board that the keyless entry on 96 and newer Z28's the keyless feature is built into the BCM.

So if I change the BCM for the keyless one and I have a keyfob fine and I can buy and program another fob.

But what about my chip in the ignition key will the BCM recognise that?

WhiteBird00

iTrader: (4)

There's more involved. You have to replace the BCM with one having the keyless entry option. But you then have to have the BCM programmed for your car by a dealer. This will take care of the VATS configuration (the resistor chip in the key).

99Z28camaroman

iTrader: (10)

Ah that puts a fly in the ointment cause I'm in the UK.

Not that I doubt what you say but I read a thread on another board where a guys says he replaced his BCM and he never had it reprogrammed by the dealer.

http://web.camaross.com/forums/showt...&highlight=bcm

I will probaly get hung drawn and quartered for posting a link to a thread on another message board but I wanted you to read it and tell me what you make of it.

Cheers Andy

WhiteBird00

iTrader: (4)

Well, if you bypass the VATS system as many people do because of installing a remote starter then you don't have to program a new BCM. The only thing that needs to be programmed is the VATS system to match to the existing keys. There are 16 different resistor values for the pellet in the key and the BCM won't let the car start if the key doesn't match.

99Z28camaroman

iTrader: (10)

I have just read a GM document that says you don't have to program a New BCM for the Vats pass key chip as when you turn on the ignition with your key it programs it self. This only covers a NEW BCM.

Unfortunatly the one I am thinking of buying is secondhand so I am not sure if that will react the same as a new one. Like you say because it is secondhand it will probably need to be reprogrammed buy the dealer.

I do have a resistor that is correct for my key as I was thinking of doing remote start at some point. Here is the paragraph on programming BCM.


PROGRAMMING
BODY CONTROL MODULE (BCM) PROGRAMMING
CAUTION: When BCM is replaced, new BCM will automatically program to
resistance of the ignition key or interrogator setting that
is used the first time ignition switch is turned to RUN
position. This process can only be performed once per
replacement BCM.
NOTE: If replacing BCM with NEW BCM, BCM will be programmed by
manufacturer in a factory test mode. This mode allows only
limited functionality. To exit factory test mode, cycle
ignition switch between RUN and OFF positions 10 times.
After a replacement BCM has been installed, use one of
customer's keys to turn ignition switch to RUN position. Start engine
to verify system operation. If SECURITY warning indicator comes on for
about 5 seconds and then goes out, BCM is programmed properly. If
SECURITY warning indicator flashes (about one flash per second) until
ignition switch is turned to OFF position, BCM did not program. Check
for faulty system components and wiring. See SELF-DIAGNOSTIC SYSTEM.

This was sent to me by the person who is selling his BCM.
Cheers Andy

WhiteBird00

iTrader: (4)

You're right. I originally went to the service manual to see what was involved. The first line reads "A new BCM is not programmed. Before the system will function properly it must be programmed to the code that matches the customer's keys." so I posted that programming was necessary. I didn't read the rest which explains that programming merely involves using the original key to cycle the ignition on and off several times (obviously something you don't need a dealer to do). That should teach me to read the whole section first.

99Z28camaroman

iTrader: (10)

I dicided to buy the Keyless entry BCM and key fob, I figured if I does not see my chip on my key when I first turn it on I will buy the other 14 resistors (they are cheap to buy) and try each one until I find the correct one.

I have a picture somewhere that tells me where to put the resistor to bypass the Vats pass key.

Cheers Andy

99Z28camaroman

iTrader: (10)

I fitted the second hand BCM that has keyless entry that I purchased from Ebay.

I took the precaution of buying the 15 resistors which cost me £1.35 ($2.30) for the set.

Sure enough when I connect the BCM the locks all worked fine from the keyfob that came with the BCM but the car would not start.

So I removed the cover under the sterring wheel tolocate the Vats pass key connector, it's a little black connector with two white wires and an orange sheath over them as in this pic.



This guys web site is outstanding and even though most of it is LT1 a lot stuff is the same for LS1 as in this case.

http://shbox.com/1/4th_gen_tech1.html

I then tried each resistor in turn until I found the one that let me start the car. The rest just give a security light on the dash and nothing happens when you try to start the car.

So I unplugged it and then I taped the resistor in place (it goes on the white wires with the orange sheath side and I just left the two white wires disconnected)

I made a note of the reading it gave on my Ohm meter before I finished up.
it gave a reading of 9.90 which is number 14 chip

Job done now I have factory Keyless entry.

All I have to do now is get two number 14 chip key blanks and have two new keys cut to restore Vats pass key if I want to.
Or if I'm any where near the one UK dealer who may be able to reprogram my BCM I can get thet done.

99Z28camaroman

iTrader: (10)

I bought a pair of number 14 chip key blanks had them cut to match my ignition key and removed the resistor to restore the Vats Pass key sytem for added sucurity.

Job done!