Electric Seats rewiring (archive)

EC,
You stated you swithched the unit and you got the same response, I assume you are referring to the 10 position switch. A wire has broken and is not giving power to the motor. This may be difficult because the seat is in the down position, but if you can pull the plug off the seat motor and take a multimeter you can jump a wire from the 12 volt wire to the up wire and get the seat to move up to give you more room to work. If because the seat is in the down position you can't get to the motor to pull the plug I assume you have forward and backward, move the seat all the way back and unbolt the seat in the front, then all the forward and unbolt in the rear. Now you have access to the motor. When you figure which wire is broken, just fish a new wire under the carpet to the switch and splice it into the wiring harness before the plug. Leave enough length for the front and backward travel of the seat so it doesn't pull apart. Alterrnately, if you want to pull the carpet up since you now have the seat out, you can find the broken wire and replace. My suggestion is to solder and use srink tubing as opposed to screw lock connetors. My seat lost the reeverse direction so I didn't remove the seat and just jumped a wire. Since you will have to remove the seat you might as well remove the carpet and replace the wire.

As for the the body difference between 84 and 86. All the body parts are interchangable. The interior differences are, 3.3 liters vs. 3.5 liters engine, different code sterio radio with tweeters in front doors, different trip computer and turn signal switch with trip computer funtion in it. The Instrument cluster uses a single mother board with batteries on the board, ie no si board, and different tach and speedo as well as PRND321 circuit board, (not compatible with early clusters, trans won't shift with lights on) (complete cluster will work in early cars), most US cars had the ZF4hp22UH eletronic trans with the switch on the console, and the drive shaft dosn't use the rubber guibo as with earlier cars for some reason. There are probably other differences too, but these are some of them. steve

Honestly, I cannot complain 220,000 miles plus and I still hit the highway without a second thought. My 733i is great! Recently the front passanger seat rear up/down power button stoped working. The seat is in the down postion and pressing the down button activates the motor. However, the up button gives no response. All other functions work. I tried switching the unit with the drivers seat unit, same response. Any ideas???

Also body wise what is different about the 1986 735i, as compared to my 84 733i. I can't put my hands on it.

Thanks

E.C.
1984 733i

Follow Ups:

THANKS Steve,one more body question? E.C. 06:48 11/11/2001 (0)
THANKS Steve,one more body question? E.C. 06:47 11/11/2001 (1)
- Re: THANKS Steve,one more body question? stevecots CHI 84/85 745 06:02 11/12/2001 (0)

[ Follow Ups ] [ 7-series (E23) Message Board ] [ Msg. Board FAQ ]

Questions, comments, or problems, please visit the Roadfly help desk.