Bake82 Posted April 30, 2014 Report Share Posted April 30, 2014 Does anyone have a 1991 Grand Prix service manual? I am looking for a pinout for a 1991 3.4 GTP Automatic with PM3. I am also looking for a 1991 GTP 3.4 5spd w/o pm3. Thank you!!!! Quote Link to comment Share on other sites More sharing options...
Imp558 Posted April 30, 2014 Report Share Posted April 30, 2014 I'll see if Alldata has it tomorrow and screenshot it for you. Quote Link to comment Share on other sites More sharing options...
55trucker Posted May 1, 2014 Report Share Posted May 1, 2014 (edited) This should help you out for the C100, I'll have to dig for the PMIII prints, from what I did see, the PMIII harness connector drawing is not pinned. Edited May 1, 2014 by 55trucker Quote Link to comment Share on other sites More sharing options...
Bake82 Posted May 1, 2014 Author Report Share Posted May 1, 2014 Thanks Steve. No worrie son the PM3 if it doesn't run through the C100 connector. I totally wish GM would have provided what each pin does rather than just the color of each wire!! but this is great! Heartbeat1991 1 Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted May 1, 2014 Report Share Posted May 1, 2014 not even a circuit number listed to help track down what they do either. Quote Link to comment Share on other sites More sharing options...
55trucker Posted May 1, 2014 Report Share Posted May 1, 2014 (edited) From what I can make out, the ABS controller (under the passenger seat) is on S189 & S229, trouble being that the manual drawings don't let you know if those circuit splices feed back thru C100 or the larger C200, there is a reference in the data line (ECM) that the controller is spliced in with the DIC, which receives a signal from the ECM on terminal B5, If you look closely you'll see a splice #144 between the ABS controller & the DIC, & a reference to to C220 & C200 on either side of the splice leading me to think that C200 is the wiring route, I don't know if that splice is in the engine bay or the cabin. The ABS controller is powered up by the ABS power center (engine bay left side behind battery) which itself is powered from the left side elec center. My understanding of the manual's wiring coding is that the 1st digit in the wiring code where a picture of a splice is noted refers to the main harness that it is run thru.....example.......S223 is fed thru the C200 harness, an S189 is fed thru the C100 harness, so when you look up in the first post & see the large pic of the backside of the instrument panel all of those S splices refer to the harness they are routed thru, either C200 or 100. Edited May 1, 2014 by 55trucker Quote Link to comment Share on other sites More sharing options...
Bake82 Posted May 1, 2014 Author Report Share Posted May 1, 2014 Thanks very much for the diagrams!!!!! Quote Link to comment Share on other sites More sharing options...
55trucker Posted May 2, 2014 Report Share Posted May 2, 2014 No problem, happy to help, now, do you think you can *see thru this *!"@*" wiring nightmare* to sort this mess out?..... Quote Link to comment Share on other sites More sharing options...
Bake82 Posted May 2, 2014 Author Report Share Posted May 2, 2014 LOL. Not sure yet. I'm trying to gather info on a 3.4 DOHC swap into a 89 cutlass. The 3400 I was after sold for more than I was willing to pay and now there is a 91 GTP with the 3.4 for sale. Motor been completely rebuilt top to bottom, which perks my interest:D I'm hopeful the wiring harness from the GTP would swap directly into the cutlass but im not sure. More research needed Quote Link to comment Share on other sites More sharing options...
Imp558 Posted May 7, 2014 Report Share Posted May 7, 2014 Sorry I didn't get back sooner... No C100 pinout for the 1991 in Alldata, this is the 1992, which might get you in the neighborhood: This is the ABS Schematic for the 1991: And this was requested too, 1998 Monte C100: Quote Link to comment Share on other sites More sharing options...
Bake82 Posted May 8, 2014 Author Report Share Posted May 8, 2014 Thanks man!!! Quote Link to comment Share on other sites More sharing options...
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