1994 Gen 1 front seat electrical problems

M

mgawat

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Figured I would post this in case someone else has run into this problem. This is my cursed from Hell 1994 Black on black I have been preparing for my youngest daughter's high school senior gift. I picked it up in 2005 and have been pecking it away at it whenever I can find the time. So far, I've fixed every problem this thing had )engine, brakes, air lift, interior, cooling) with the exception of electrical problems, specifically front seat's not working, moonroof not working, and wiper's not working.
I made sure I had a good set of seat tracks by using my other three mark's (2-93's and 1 94) for testing purposes. However, when you put the verified good driver's seat in the kid's car. only the lumbar works. I noriced alot of corrosion on the pin connetors on both C304 and c303 and cleaned them off. I further discovered that the orange input coming from fuse 6 was open resulting in no power although the black ground is good as well as the BK/w coming from cb 12. I am lucky enough to have an almost complete 1993 part's cart that I started taking apart and verified that the part's car continuity on orange 931 to fuse 6 was good. Getting out the parts car floor harness was a little bit of an adventure requiring, at least for me, to remove the parking brake assy so I could get enough wiring harness out to work on. When I tested my daughter's car ,without removing the parking brake assy, I discovered that the orange 931 wire has plenty on continuity from the fuse 6 block to c 214 but no continuity from the C302/303 seat connectors to C214 female side. I do have continuity from driver's side to passenger side however. I am planning on just bypassing the pin connectors on the orange 931 wire for simplicty once I get the parking brake assy out and go from there. I do know the front windshield is crancked and also has been leaking significantly and was wondering if that water accumulating below the carpet could have casued the s312 splice to corrode (of course, I don't yet know where that splice is located to check it for certain but, if it is under the carpet, I would definately consider it suspect. Any help on things I may have overlooked would be appreicatyed.
 
Well, the good news is that the wipers being in-op is a VERY easy fix. Depending on the symptoms its either the MLFS(Multi Lever Function Switch/aka wiper switch) or its the Wiper Motor. Sounds like you have those parts already, so its just a matter of swapping them.

It also sounds like you are on the right track.....do you need any more wiring diagrams?

Also....if the carpet is wet on the passenger side, it may not be the windshield(which commonly DON'T leak), but instead its either a leaking heater core, in which you'd smell coolant in the carpet, or its a clogged water drain in the heater box causing rain water and condensation to build up and leak out because it can't drain.
 
next step of fix

next step of fix

I spent part of the day between rain storms removing the wiring harness out of my parts car that feeds both the seats and doors as well as some other parts out back. The good news is that I got everything out without having to resort to wire cutters and solder. The bad news is that I really don't feel like reMoving all this on my good car especially where the door windows and locks work just fine now just to fix the power seats. I really wish I knew where than splice was located since I'm sure that's at least one problem. I will proably end up replacing all the hanress I took out of the paRTTS CAR EXCEPT FOR THE DOOR PORTIONS WHICH i WILL PROABLY SPLICE AND THE PART THAT GOES DOWN THROUGH THE BACK FLOOR (PROABLY FUEL PUMP POWER?)
 
Wow....sounds like a ton of work. Why don't you just run a separate power wire to the seats, add a fuse, and maybe a switch?
 
I saw someone else tool that approach and the daughter's car wiring is taking on the shape of a rat's nest. I've come this far in this that I am restoring and not repairing especially is everything just unplugs and the connections are good. I haven't yet got the seats in the daughter's car (obviously because that's when I found this problem) so I guess I'll keep venturing forward once the weather clears back up.
 
I swapped 99 Cobra seats into my 88 Mustang Notch and all I had to do was run a power wire and the seats worked great. :D
 
well, swapped out wiring harness and fixed that problem plus a bunch of other ones. I only had one question. On my 1994 harness , there was a seperateplug to the power mirrors mounted on the door next to the seat memeory module. On my donor harness and 1993 doors, this wasn't there. I imagine it might by the memory connector for the power mirrors?
Lastly, I am missing two components the mount towards the outside on the driver's door. One plugs into a white connector and the other inr=to a round black one. I noticed the passenger door did have these devices and I am getting ready to tear down the donor driver's door to find out what's missing. However, you folks could sure help me out if you had a vlue (doesn't seem to be the door lock motor, door shut indicator, or the key lock keypad)>
 
I identified one of the missing wires as the key lock light. Normally, I'd live without it but because I'm trying to do this once, I took one out of my spare door pile and brought it over to my trusty locksmith to make it work with the iother car key. The other missing line seems to be the door open button looking at dsome of my other behicles. What has me lost is the differnce in the mirrors between my two cars. The one I took out has 2 sets of wires coming out of the mirror. The went to the missing connector in this harness. Here is the picture of the mirrors in case anyone can quickly tell me the difference:
http://img.photobucket.com/albums/v639/mgawat/memorymirrors.jpg
 
I think I rember hearing that memory mirrors started in 94. I'm not sure about this though.

Can anyone with a 93 chime in on this?

Also, the extra plug might be for the electrochromic mirror option. Does this mirror glass look different than the other one?
 
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My '93 has non-memory power heated mirrors. According to the EVTM, the 'memory power heated mirrors' started in '94 and included an 'memory mirror module' which is located in the right hand side of the luggage compartment.
 
weel that would explain what some of the other wires on the 1994 wiring harness went to on the passenger side. Thanks for that info...I'l;l have to check out that memory chip tommorrow. In the meantime, I just swapped out the 1994 2 wire mirrors for 1993 single wire mirrors and everything works.
 
I found the 1994 mirror memory module on the right hande side trunk support and removed it along with the rest of the old harness. That was the only difference between my original 1994 and 1993 donor harness. I'm happy to say it's all back togetrher and ready for fire up.
 
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