Hello there:

The driver's side seat on my 1999 C70 is dead. The passenger's is OK.

It has been acting funny for quite some time, running roughly when moving backward.

The other night while driving I detected a mild burning electronic smell and the next day discovered the seat was dead.
I checked and actually swapped the seat circuit breakers and no change.

It looks like the seat "Brains" are in a small black box under the seat and I have a few questions.

1. Is this the likely culprit?

2. Is the box swappable between seats?

3. How does one go about taking the seats out to do so. I removed the front mounting bolts and the seat swings up a bit, but not enough to access the rear cables connecting into the control box.

any help is REALLY appreciated!

Thanks,
Ron Y

 

If it is slid back and covering the Rear bolts and deosn't work it will be a big pain.

Also check the Micro switch by the outside edge where the Seat pivots. The switches break out of the plastic and the Seat won't work.

 

Tech: Thank You, Thank You, Thank You!!!!!

The microswitch was indeed hanging loose. I can't figure out where it goes but I black taped it closed and the seat works. The "Auto Slide Forward/Back" when tilting the back does not work, but I really do not care about that.

Is there any other safety reason not to leave it taped closed as it is now?

Thanks ,
Ron Y

 

That will be fine for now.
That switch only disables the Seat motors when the seat is folded foward for someone to get in the Rear.

 

Thanks again!

Boy I could see a shop charging a mint for this quick repair. Who would know?

"Removed the seat and changed the module".

Thanks,
Ron Y

 

is there any photos of this location?

 

Volvo charged me $1,000.00 to replace the 1st switch. It failed 9 months later, I replaced it the 2nd time, and used a heavier spring. I removed the seat and put it up on my bench.