Need input: 89 gte, wiring, ecu into 87 n/a

[Insidious Surmiser]

My frind cj and I swapped the motor from my 89 supra + wiring harness and ecu into a 87 n/a I just bought. The body harness plugs into the 89 turbo ecu. The issue we're having is that when the battery is hooked up, the lights turn on, but do not flip up, and the horn on the firewall emits a weak, constant honk. Everything else appears to be normal though (gauges, light operation) I'm guessing the pinouts are different on the two years (in fact, i'm 99% certain they are). I'd appreciate any input anyone can give me. I've also been unable to find the pinouts from the 87 year model or the late 89 year model although I found 88 :icon_neut

info that may help:

the 89 car was made in jan. of 89. Has grey harness plugs. Has hydraulic engine mounts.

 

[jetjock]

This rings a bell but it's been some time. If I recall correctly the problem lies in connector B1 (located near the ecu) but I forget the exact issue involved. It's a difference between the engine and body harness that results in a problem between the theft system and the headlight circuit, which need to be connected together for theft system control of the headlights. Anyway, the problem isn't difficult to resolve using the theft and headlight schematics. More bad news: You may find integration relay #2 has been fried and until you fix the problem any new one you install will also be destroyed so either unplug it or unplug B1 until you figure it out.

 

[SLO-MK3]

The same thing happened to me when I tried to use an 87-88 harness in my 89, headlights came on in the down position and the horn was a blowin'. There's a few wires that you need to switch around on the harness side of the big square plug. Use a tiny pick to release the metal clips from the plastic plug and put them in their corresponding holes so that you've basically color coordinated the harness side to the dash side(I think there's only about 4-5 wires you need to change). You should draw out some diagrams before you start so that you know what wire goes where if you decide to change it back.

 

[Insidious Surmiser]

This rings a bell but it's been some time. If I recall correctly the problem lies in connector B1 (located near the ecu) but I forget the exact issue involved. It's a difference between the engine and body harness that results in a problem between the theft system and the headlight circuit, which need to be connected together for theft system control of the headlights. Anyway, the problem isn't difficult to resolve using the theft and headlight schematics. More bad news: You may find integration relay #2 has been fried and until you fix the problem any new one you install will also be destroyed so either unplug it or unplug B1 until you figure it out.

thanks for the info, i'll try to find the schematics and look over em.

 

[Insidious Surmiser]

The same thing happened to me when I tried to use an 87-88 harness in my 89, headlights came on in the down position and the horn was a blowin'. There's a few wires that you need to switch around on the harness side of the big square plug. Use a tiny pick to release the metal clips from the plastic plug and put them in their corresponding holes so that you've basically color coordinated the harness side to the dash side(I think there's only about 4-5 wires you need to change). You should draw out some diagrams before you start so that you know what wire goes where if you decide to change it back.

i'm talking about putting a 89 7m-gte, harness, and ecu into a n/a 87 car.

 

[SLO-MK3]

i'm talking about putting a 89 7m-gte, harness, and ecu into a n/a 87 car.

And I was talking about putting an 87-88 7mgte harness and ecu into an 89 n/a car.

 

[Insidious Surmiser]

There's a few wires that you need to switch around on the harness side of the big square plug. Use a tiny pick to release the metal clips from the plastic plug and put them in their corresponding holes so that you've basically color coordinated the harness side to the dash side(I think there's only about 4-5 wires you need to change). You should draw out some diagrams before you start so that you know what wire goes where if you decide to change it back.

Well, it's as if you were telling me what to do to solve my current situation. That's the way you worded your response. :dunno:

 

[rot 90na-t]

Well, it's as if you were telling me what to do to solve my current situation. That's the way you worded your response. :dunno:

He's simply stating that he had a similar problem with a different year car.. Which in turn could be resolved in a similar fashion.

 

[Insidious Surmiser]

I got a 87 engine harness and ecu for $100. going to pick it up tomorrow. Guess i'll pull the realy from the 89 as well. thanks for the help again jetjock

 

[jetjock]

I'd appreciate any input anyone can give me.

You be welcome. Slo was just trying to help so cut him some slack eh?

 

[Insidious Surmiser]

lol, i just tell it how it is

 

[Insidious Surmiser]

hrm.... so, i found the relay in my 89, but can't find the one in the 87 to save my life.... :1zhelp: it's not in the same location, and i looked everywhere. The hanes manual was of no help once again.:nono:

 

[jetjock]

What relay? Integration Relay #2? It's up behind the fog light switch panel on an 87, same as shown in the online TSRM:

http://tinyurl.com/332p2n

Why don't you have a real manual and an EWD? And why not simply move the wire instead of getting another harness? I'm confused...

 

[Insidious Surmiser]

it's a rush job... i'm 19 and in college, and this car is my DD

did I also mention i'm terrible at finding information i need?:dunno:

I also just got the car, and I've never had a use for a 87 manual before (just had my 89)... guess I do now

o, and thanks a ton for the info again... i guess you could say I owe ya one