Question about 1999 Pontiac Grand Prix
99 pontiac grand prix 3.8 l A/T.No battery power to the ''hot at all times''red wires at pcm.also no power or codes at data connector.vehicle still runs. Haynes manual wiring diagrams are inadequate.
Pin 20 on the blue pcm connector is the power wire to the pcm it is an orange wire. (hot at all times). The power to the data link connection is the cig fuse in the i/p fuse box.
What is the exact problem you are having?
Posted on Aug 04, 2009
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Posted on Jan 02, 2017
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