So I have put a power passenger seat in the car, and need to wire it up so it works. I don't really care about the memory function - just want to get it to be able to move. Has anyone done this before with any success?

If so, how?

Thanks in advance, all!

 

Does your car have the wire harness under the seat/carpet?

 

No, it doesn't.

 

Easiest way would be to tie into the drivers seat and run a wire over. Fuse it with whatever the drivers seat takes as close to your splice as you can. Depending on how neat you make the run you might want to put it under the carpet or put some carb fuel line over it to protect it if you run it under the console on top of the carpet. Don't use vacuum line to protect it as it's not as sturdy. Gas line has woven cord for strength and will withstand abrasion much better and longer.

Only thing I'd be careful of is that you don't adjust both seats at the same time. I'm not sure what amps those motors draw but I'd go one size up from the drivers seat wiring if you do decide to take power from there.
AND . . . solder the connection, DO NOT use a scotch lock to splice in. They are OK for cheap inside connections but never use one where it can get wet or needs to carry heavy current. Never on a trailer hitch. They break the insulation cover open and water gets in there and starts corroding the wire on the inside. States with winter salt are the worst !!!

 

Yeah I never use scotch locks. I see 4 wires on the passenger seat harness and only 3 on the passengers seat. can anyone clue me in to which wires is which on each seat?

 

Do you have the Memory Seat Control Module (MSCM) that mounts under the seat? I am assuming yes, since you mentioned 3 wire feed..

Do you have a schematic? I have access to one for '95/'96 but not sure if it's different from '94.

I see four wires feeding the seat controller (MSCM):

1. Blk = ground (30A rated)
2. Grn (Grn/Red on driver's side) = 30A 12V pwr feed from circuit breaker #40 (#38 feeds driver's side).
3. Yel/Vio = feed from fuse #33 (15A); my guess this is memory function since lower current rating.
4. Brn/Or = looks like it goes to Diag connector.

So my guess is if you hook up the first two wires, that should get it moving sans memory functions.

 

I retroffited 7 or so power seats in all model years from 95 to 97. From 96 onwards the connectors have changed under the dashboard, and the seats no longer have switched power supply .

You need the big 20A fuse PN 3545478 (same as the one for the power windows) 1 per seat. Take the lid from the fuse box away (4x Torx 25) and insert the fuse(s) : Pos 39 is for the driver, 40 passenger. This applies to all modell years

You also need the crimp connectors : Volvo PN 979002 5 per seat, and the smaller ones which can be bought from eBay for a small amount of money (3x per seat) They look like this 10 x 2 8 Timer ISO Female Receptacles Connectors M 55 | eBay I get them here in Germany very cheap 2€ for 10pcs...

Also needed is some wire 2mm² and 0,6mm²
If you do not have the connector housing for the seat the PN is 968484. You need 1 per seat.

Getting the power to the seat:
MY95 and older:
Driver seat
Take off the cover under the dashboard on the driversside. Locate the 3 big connectors under it. The one on the left (near the door) is the winner:

Dissconect it.
Notice that each position is numbered (the numbers are small)...Locate position 1 in the connector (it has a big hole for the big crimp connectors. Crimp one of the big connectors onto a 2mm² wire. This is the permanent power feed. Insert the connector inside.
Route the cable along the door under the plastic cover and take the "exit" under the drivers seat. The other end of the cable will get also one of the big crimp connectors and insert it into position 1 of the connector housing.

Locate on the big connector 2x positions : 29 and 45. In each of them go the smaller crimp connectors with a 0,6mm². Route the wires the same as the previous one. 29 goes in the housing at position 2, 45 at 4. 29 is ignition +12V and 45 is for diagnose.

Now insert a 2mm² with a big crimp connector into the last free place in the connector housing under the seat and route the cable along the door but in the back of the car under the rear sets. Take the carper to the side. You will find a ground point where more black cables are fixed with a screw. This is where this cable belongs it is the ground.

Now the drivers seat should work

Passenger side
Take off the cover of the dash in the passenger compartmen. Locate the big connector. It ist behind the glovebox more or less.

The 2mm² permanent power wire goes into position 1 and uses the big crimp connector.
The 0.6mm² ignition power gets in 28 and 0.6mm² diagnose goes into 29.
Route the 3 cables analog to the drivers side and connect as follows:
Permanent power position 1 in the connector housing
Switched power 2
Diagnose 4

Ground goes the same under the rear seat but on the passenger side.

96 models differnces
Starting from 96 the 850 got a different connectors under the dashboard.
Also the seats lose the switched power supply.

The big connectors are now composed from more smaller connectors which are marked with A, B, C, D ,E
The wiring at the seat is the same as pre 96 models. Also ground is the same

Permanent power goes into the E connector Position 2
Diagnose goes into A position 2.

Passenger side
Permanent power connector A position 1, diagnose B position 9.

The crimp connectors needed are : 9148085 for the big cable and the 9148075 for diagnose.

This should cover it all

Happy crafting
Cristian

 

Gdog: thanks for the help - and to everyone else. As of now, the passenger side seat has both power and memory functions.