Only one side moved and I forgot which side. (it has been out of the car for more than a year). My questions are:
How to fix this issue?
With the seat out of the car, is there a way to power it for testing?





Tom

Remove the crimped end on the outer, shorten the outer by 10mm. Recrimp (I used two pairs of plyers at right angles) , job done. This was on a 760T.

Ian

2 connectors from the seat:
one - 2 wires - is for the seat belt.
the other is bigger with 4 wires: I hook up the red with black stripe to the + side of the battery, and the black wire to the - of the battery. After that I was able to bench test the seat all afternoon :)
Here is what I found out:
When only one side moves, then that is a good news, because that means the motor is working.
Here are some pics:














I hope the pics show up nice

Tom

If you open the door to your car, you can probably connect the cable from the seat to the power connector that comes out of the floor right next to the door jamb. you might have to prop the seat up on top of something, but it shouldn't be too hard.

DS and PS are totally different and are both failure prone. The DS is a memory seat and the PS is not.
The PS powers from the hand control. The DS powers from the module (the green connector plugs into th emodule which is activated by the hand control.
With my failed seat it was the DS handset that was failed. Actually that green connector was where my fault was. All of the wires where crunched and broken. 14 wires i think. Someone had stuffed something under the seat and impacted that connector. I have heard of the module going to. Haven't heard much of the motors failing. I got a hand control from the P+P for $15 and all was well.
--
73 ES, 91 240, 98 S90

to add to that, the other problems these seats encounter include broken tracks and loose cables to the motors. Lots of info in the FAQs.

Assuming that the DS seat is like the PS seat, since it is the PS seat with which I have recent experience - here's the method.

Look for three wiring harnesses coming out from the back side of the control panel. Two of them remain connected even when the seat is removed, they carry power from the control panel to the motors. The third one must be disconnected to remove the seat.

A) 2-wire cable connecting to a connector to the rear of the seat. This is the power from the control panel to the seat-back tilt motor. Leave it connected

B) 6-wire cable to a connector near the console side of the seat. This is power from the control panel to the three motors that move the seat bottom. Leave it connected.

C) 2-wire cable to a connector that connects to a harness under the carpet near the left front of the seat tract. This is power to the control panel and thence to all the seat motors.

Remember that the Driver Side seat is powered without the ignition key.

Provide 12v power to connector C and you can test the seat out of the car.

If the connection has the positive and negative sides reversed from the way they are it is when in the car, the control panel switches will be reversed.

Try the switch that moves the front of the seat bottom up or down to see if the poles are reversed. Push DOWN, get UP => poles reversed. OK to leave as is for your test.

The system is wired like power windows and door locks. Reversing polarity makes the motor (or solenoid) reverse direction. All the control switch does is connect power to the motor with polarity one way for UP (for example) and the other way for DOWN.

I tested the used passenger side seat I had purchased in that way. Then I was able to move the seat back to full forward position so I could move it into a temporary storage location.

The information I used was found in my Volvo Service Manual Wiring Diagrams for the 1997 960, 1998 V90, S90.

If a motor runs but nothing moves, the problem is in the drive cables. Other BB 960 owners have replaced such a cable. Some have just reversed a bad one end-for-end and had it work. Not an area in which I have experience.

Good Luck,

Bob

:>)

I will post some pics tonight and both sides move well now.