having trouble removing PCM
#1
having trouble removing PCM
hey im trying to remove a PCM on a 1991 oldsmobile tornado. i know its not a cadillac but i figured someones done it before because it is a GM. Its located under the glove box. It almost looks like i have to remove the big black box which im guessing is the heater. It looks like the PCM should just slide out but its not, what do i need to disconnect.
#2
ECM is located between programmer and heater case. Disconnect 3 connectors, mounting bracket and wiggle it out. You may find vac. harness is in the way, if so disconnecting it from programmer may help. ECM has chip that will need to be transferred to new ECM.
#5
alright, i got the old one out and just bought the new one. it says with the new one that i have to diconnect the negative ternminal before removing the PCM to avoid risk of electrical damage, i didnt do this. am i going to have problems? ill disconnect when i install the new one.
#6
It's always best to disconnect negative cable, before connecting or disconnecting modules. Having out of ignition will minimize risk if you don't. Some body control modules (BCM) can be powered up with just the key in the cylinder even in the "Off" position. The concern is about voltage spikes the could damage computer circuits if battery is connected while module is being serviced.
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dpv1977
Cadillac Seville
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01-11-2008 10:55 PM