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Seat wiring

Help, Advice, Owners' Discussion and DIY Tutorials on Volvo's stylish, distinctive "P2" platform cars.

2001 - 2007 V70
2004 - 2007 V70 R
2001 - 2007 XC-70
2001 - 2009 S60
2003 - 2007 S60 R

Trapperjohnlu
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Joined: Fri Apr 17, 2020 8:20 pm
Year and Model: 2005 xc70
Location: Ontario
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Trapperjohnlu

Seat wiring

Post by Trapperjohnlu » Fri Apr 17, 2020 8:24 pm

Hey there,

Doing somewhat a unique project. My xc70 died but I loved how comfy the seats were. I am also in the process of building a driving simulator rig for vr.

The two worked out well, but I am trying to get the electrics to work with a 12v power supply so that the seat can be adjusted for other drivers.

I don’t was to experiment to find which wires supply power and accidentally set off the air bag or other parts of the crash system.

Any help would be appreciated!!

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darrylrobert
Posts: 176
Joined: Fri Mar 06, 2020 6:25 am
Year and Model: 2001 v70xc
Location: australia
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darrylrobert

Re: Seat wiring

Post by darrylrobert » Fri Apr 17, 2020 9:22 pm

i have rigged up a power passenger seat in my xc70 using double pole relays. Two relays are needed for each motor , you also need to re-wire the factory switch bank. I have purchased two of these for testing (pic below). The problems with using relays is the overload current spikes to 10amp at end of seat travel, relays rated 10amp can handle this but its not ideal. The Volvo seat module uses small relays (2amp) and some clever electronics (over current protection) that cut power as soon as it detects the seat has moved far enough.

For power i would use a small 12v battery and have a plug in charger.

The airbag connector is seperate it has a distictive orange cable, it would be wise to not apply any voltage to this, the bag can be removed but you may have to remove the seat skin, personally i would put tape on it and hide it.

As far as using the Volvo module, im not sure its possible outside of the car
seat relay.jpg
seat relay module
seat relay.jpg (20.44 KiB) Viewed 107 times

Trapperjohnlu
Posts: 3
Joined: Fri Apr 17, 2020 8:20 pm
Year and Model: 2005 xc70
Location: Ontario
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Canada
Trapperjohnlu

Re: Seat wiring

Post by Trapperjohnlu » Sat Apr 18, 2020 11:24 am

I did some more playing today and I managed to get it functioning (not sure if the heated seats are working yet) but all the electric adjustments work.

It required the union of 4 reds and 3 black wires that originally went to the wire harness in the car, it can be done with the module in place.

I also did not detonate anything!

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darrylrobert
Posts: 176
Joined: Fri Mar 06, 2020 6:25 am
Year and Model: 2001 v70xc
Location: australia
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darrylrobert

Re: Seat wiring

Post by darrylrobert » Sat Apr 18, 2020 8:41 pm

Do you have any pictures, i dont understand where you got 4 red wires and three black?..what year Volvo is this?

Trapperjohnlu
Posts: 3
Joined: Fri Apr 17, 2020 8:20 pm
Year and Model: 2005 xc70
Location: Ontario
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Trapperjohnlu

Re: Seat wiring

Post by Trapperjohnlu » Sun Apr 19, 2020 8:05 am

It is difficult to get a picture cause I have everything tucked away. This comes from a 2005 xc70 in Canada.

3 reds come from the car side of the control box (top of the pic) and the 4th comes from the loom that goes up the passenger side into the back of the seat.

2 blacks come from the same loom as the 4th black, and the 3rd comes from top of the control box (2 merge into one)
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76F05B82-D9D6-46AD-B2D4-8EDB79E6E8CD.jpeg

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darrylrobert
Posts: 176
Joined: Fri Mar 06, 2020 6:25 am
Year and Model: 2001 v70xc
Location: australia
Has thanked: 3 times
Been thanked: 6 times
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darrylrobert

Re: Seat wiring

Post by darrylrobert » Sun Apr 19, 2020 8:50 am

Interesting, thanks. looks different to my 2002

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