Spiers

iTrader: (7)

So the almighty security light came on several months ago, and hasn't went away.

Ive tried:
New ignition key
Ignition switch
Theft deterrent relay

What else is there to replace so I can get rid of the light?

hitmanws6

iTrader: (20)

my guess would be replacing the whole ignition assembly

Spiers

iTrader: (7)

Ive verified that it is reading the correct ohm of the ignition key.

brianfromhawaii

iTrader: (3)

Hook up a scanner, often times its the BODY CONTROL MODULE

Spiers

iTrader: (7)

Is there another name for this "body control module" ? O'Reillys couldn't find me anything

lovin myls1

iTrader: (4)

Do you have the factory spare key?

WhiteBird00

iTrader: (4)

No, that's what it's called. It is, however, the type of part that is usually OEM only. Like the PCM (Powertrain Control Module - the engine computer), it's not usually available as an aftermarket replacement part. The GM part number for a 96 BCM is 16243951.

Spiers

iTrader: (7)

^ Thank you. $191 from GMPartsdirect And yes I have three different keys for the car including a brand new one, have tried all of them.

lovin myls1

iTrader: (4)

Before you buy a BCM I would check the resistance of the keys,then check the resistance of a key in the ignition at the plug at the bottom of the steering column-should be within 5 ohms of the key resistance.THEN and most importantly,check resistance of the wires that are the input to the BCM to make sure it's getting the proper input-again within 5 ohms according to the service manual.If the BCM is getting the proper resistance and the security light still lights, I would be fairly certain it's the BCM.

lovin myls1

iTrader: (4)

Wait!Wait! My previous post MAY be in error.I don't have a wiring diagram for a '96- only a '95 or'99.On the '95 the resistance fron the key is read by the Theft Deterent Module and on the '99 the key resistance goes to the BCM so disregaurd my previous post as I can't make a judgement here due to lack of info.Sorry!Hope you get it fixed-Best of luck!