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Old 07-10-2012, 07:36 PM   #11
ChevyTech
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Join Date: May 2004
Location: Minnesota
Posts: 4,620
Re: 1990 brake light switch

Quote:
...and where is my PCM located ?
Technically A PCM is in a vehicle where the computer does all the shifting of the transmission.

Your truck has an ECM in the area behind the glove box.

If I can find some free time tomorrow, I will see if I have a schematic for a model year earlier then 1993.
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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