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PostPosted: Tue Feb 20, 2018 5:37 pm 
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Posts like an LN3
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Joined: Fri May 23, 2008 12:37 am
Posts: 513
Year and Trim: 2000 Pontiac Bonneville SE
I'm Looking to do a complete engine and trans swap along with the pcm from a 98+ W body. in terms of wiring, what do I need to modify to make my currents electronics work? Thanks

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2000 Pontiac Bonneville SE
1997 Oldsmobile Eighty Eight LS
1993 Buick Regal GS Coupe
1992 Buick Regal Limited Coupe


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PostPosted: Wed Feb 21, 2018 3:40 pm 
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Certified Bonneville Nut
Certified Bonneville Nut
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Joined: Tue Aug 25, 2009 8:32 pm
Posts: 4420
Location: Dearborn, MI
Year and Trim: '93 SSEi
'05 STS-4
'97 Camaro
'97 LeSabre
In my experience, all you need to do is hook up the wires from the pcm to the gauges and everything will work (went from a '98 SSEi into a '86 LeSabre, and then into a '93 SSEi). Fairly easy to do if you understand basic DC circuits.

You will need the service manuals or access to the wiring diagrams. You will likely have to make a harness adapter for the firewall, where you can add any relays and whatnot that the '98 pcm wants. Things like the fuel pump relay, any security system wiring, OBD connector, cruise control module ignition wiring, power and grounds, etc where wiring will need to be added; and for the most part all the gauges, cooling fan relays, evap, A/C relays, park neutral switch, just need to be connected to the right wire. If you make a firewall adapter, you can limit anything that could be wrong with the wiring to that adapter.

On the older H-body cars the PCM was under the dash. I use the PCM as an adapter box for the harness under the dash, and made an adpater that plugs the donor harness into the factory firewall pass-through. That way if I ever decide to sell the car it's plug and play to put it back to stock. Like this:
Image

You mostly need the wiring diagrams to check for differences between circuits (so you can hook them up right). An example would be if the check engine light on the '92 gets it's +12v from the PCM but on the '98 it get's grounded through the ECM. Another example would be the starter wire on the '92 coming out the drivers side pass-though, but on the '98 it goes through the passenger side pass through.

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Runs:
'93 Pontiac Bonneville SSEi - Twincharged, manual, and lots more! Build thread
'97 Chevy Camaro - 3800 supercharged, T5, T-tops
'05 Cadillac STS - V8, AWD, her DD
'92 Olds Trofeo - Fair weather DD
'84 GMC Sierra Classic - Twin turbo 3800
'97 Buick LeSabre - L67 winter DD
'92 Pontiac Bonneville SSE future project

Doesn't run:
'87 Buick LeSabre T-type - future victim
'67 Buick LeSabre - future victim


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