Electrics: 850: - Help connecting/fixing electric heated seats

geekman · Nov 25th, 2012, 15:36

According to the guy I bought it from, my 850 T5 has a T5R interior fitted, but only the drivers seat electrics and heating works - the passenger side is completely useless. I've had a look under each seat to see if I can spot any differences (e.g. if the driver's side has something connected which isn't connected in the passenger side, I can connect the passenger side and get it working)

I had a look and it looks like the passenger one isn't earthed but other than that I can't see any obvious differences - I'm utterly useless at electrics.

I've taken some photos of the wires underneath each seat, can anyone spot any reasons why the passenger side one isn't working?

Drivers side photos (WORKING)

Passenger side photos (NOT WORKING)

Cheers

scutyde · Nov 26th, 2012, 10:11

The grey connector on the right side of the pic in the background is the connector for the power seat (the controls of the seat).
1 is 12v hot all time
2 is ignition plus
3 is ground
4 diagnosis

You can skip diagnosis.
Download from MAtthewsvolvoSite the wiring diagramms for your car and you can see there where each cable goes. The connector for the grey connector can be bought at the dealer costs around 1€, the plugs for it costs also around 1€ per pcs

Numbers for the connectors are:

Grey Connector 968484
Contact (4x) 979004

You also need the big fuse (20A) looks like this http://www.skandix.de/en/spare-parts...0406f664d2d05d goes under the lid from the fuse box at Pos 40.

The Cables for from the 4pole connector go as folllows:

Remove the cover from below the dashboard (passenger side). When you look up you will see a big connector (45 leads).

If your car is MY95 and bellow you need to connect as follows:

12v hot all times cable (which should be thick 2mm² ) at position 1 (you also need the Contact (1x) 979004)
12v ignition plus goes to pos 28 (standard ISO contact for the speakers is cheap in Ebay)
Diagnosis goes to pos 29 (standard ISO contact for the speakers is cheap in Ebay)

Ground goes behind the carpet on the rear seats. Take the carpet asige and you will see a ground point. The ground cable is also 2mm², the other 2 0,6

If your car is MY 96 or 97 then:
The connector in the dashboard looks different
You need 3 ISO contacts
12V hot all times goes to connector A pos 1
Diagnosis goes to connector B pos 9.
12V ignition plus is not connected.

For further questions ask

Cristian

scutyde · Nov 26th, 2012, 13:28

To the heating part of your problem

The heating pads are known to fail... Mine has a different setup as yours , I have the thermostat beneath the heating pad, and no relay as yours so I am not sure how the parts should be connected. From what I see in your pics some connectors are not "connected" on both sides. Does the heating work on the drivers seat?`

Take an multimeter and check the voltage at the cables coming in and out of the relay (the black box with the no 8684991). If you have 12v then most likely one of the pads or both are broken. You can measure each pad using the ohmeter function.

rallysteve · Nov 27th, 2012, 19:55

The black box fitted to the right hand one is part of the factory recall for the heated seats. Its a timer which does away with the thermostat. I removed it on mine, I recrimped the broken terminals onto the thermostat in the seat base and reconnected the original wiring. Hope this helps.

Steve

geekman · Nov 30th, 2012, 16:34

Thanks guys, that does help. To be honest, it all looks a little too complicated to me: I've done small jobs like interior trim and mirrors no problem, but I think that might be a bit too tricky as I know nothing about electrics, never so much as crimped a wire in my life!

byootox · Nov 30th, 2012, 20:02

Steve, I couldn't help but notice your post about the black box factory recall for the heated seats, I've accidentally busted off the terminals on the thermostat on the drivers seat base cushion on my 99 v70 but when I bypass it the seat does heat ok, but not keen to use it in case in burns the leather.
Could I fit one of these relays instead ?
Does the black box relay cycle the heat pad off and on every so often ?

Nov 25th, 2012, 15:36	#1
geekman Junior Member Last Online: Jan 30th, 2014 23:22 Join Date: Nov 2012 Location: Surrey / London	Help connecting/fixing electric heated seats According to the guy I bought it from, my 850 T5 has a T5R interior fitted, but only the drivers seat electrics and heating works - the passenger side is completely useless. I've had a look under each seat to see if I can spot any differences (e.g. if the driver's side has something connected which isn't connected in the passenger side, I can connect the passenger side and get it working) I had a look and it looks like the passenger one isn't earthed but other than that I can't see any obvious differences - I'm utterly useless at electrics. I've taken some photos of the wires underneath each seat, can anyone spot any reasons why the passenger side one isn't working? Drivers side photos (WORKING) Passenger side photos (NOT WORKING) Cheers

Nov 26th, 2012, 10:11	#2
scutyde Retrofit master Last Online: Mar 28th, 2022 10:14 Join Date: Mar 2010 Location: Berlin	The grey connector on the right side of the pic in the background is the connector for the power seat (the controls of the seat). 1 is 12v hot all time 2 is ignition plus 3 is ground 4 diagnosis You can skip diagnosis. Download from MAtthewsvolvoSite the wiring diagramms for your car and you can see there where each cable goes. The connector for the grey connector can be bought at the dealer costs around 1€, the plugs for it costs also around 1€ per pcs Numbers for the connectors are: Grey Connector 968484 Contact (4x) 979004 You also need the big fuse (20A) looks like this http://www.skandix.de/en/spare-parts...0406f664d2d05d goes under the lid from the fuse box at Pos 40. The Cables for from the 4pole connector go as folllows: Remove the cover from below the dashboard (passenger side). When you look up you will see a big connector (45 leads). If your car is MY95 and bellow you need to connect as follows: 12v hot all times cable (which should be thick 2mm² ) at position 1 (you also need the Contact (1x) 979004) 12v ignition plus goes to pos 28 (standard ISO contact for the speakers is cheap in Ebay) Diagnosis goes to pos 29 (standard ISO contact for the speakers is cheap in Ebay) Ground goes behind the carpet on the rear seats. Take the carpet asige and you will see a ground point. The ground cable is also 2mm², the other 2 0,6 If your car is MY 96 or 97 then: The connector in the dashboard looks different You need 3 ISO contacts 12V hot all times goes to connector A pos 1 Diagnosis goes to connector B pos 9. 12V ignition plus is not connected. For further questions ask Cristian __________________ Volvo 850 2.5 20V MY95 Pictures Here what I retroffited so far List

Nov 26th, 2012, 13:28	#3
scutyde Retrofit master Last Online: Mar 28th, 2022 10:14 Join Date: Mar 2010 Location: Berlin	To the heating part of your problem The heating pads are known to fail... Mine has a different setup as yours , I have the thermostat beneath the heating pad, and no relay as yours so I am not sure how the parts should be connected. From what I see in your pics some connectors are not "connected" on both sides. Does the heating work on the drivers seat?` Take an multimeter and check the voltage at the cables coming in and out of the relay (the black box with the no 8684991). If you have 12v then most likely one of the pads or both are broken. You can measure each pad using the ohmeter function. __________________ Volvo 850 2.5 20V MY95 Pictures Here what I retroffited so far List Last edited by scutyde; Nov 26th, 2012 at 13:33.

Nov 27th, 2012, 19:55	#4
rallysteve Master Member Last Online: Dec 23rd, 2019 18:11 Join Date: May 2010 Location: South Yorkshire	The black box fitted to the right hand one is part of the factory recall for the heated seats. Its a timer which does away with the thermostat. I removed it on mine, I recrimped the broken terminals onto the thermostat in the seat base and reconnected the original wiring. Hope this helps. Steve __________________ 1997/98 V70 T5 Manual - Now Gone 1989 205 GTi16 Track Car 1991 205 GTi Road Car

Nov 30th, 2012, 16:34	#5
geekman Junior Member Last Online: Jan 30th, 2014 23:22 Join Date: Nov 2012 Location: Surrey / London	Thanks guys, that does help. To be honest, it all looks a little too complicated to me: I've done small jobs like interior trim and mirrors no problem, but I think that might be a bit too tricky as I know nothing about electrics, never so much as crimped a wire in my life!

Nov 30th, 2012, 20:02	#6
byootox Premier Member Last Online: Dec 20th, 2021 23:22 Join Date: Oct 2012 Location: Edinburgh	Steve, I couldn't help but notice your post about the black box factory recall for the heated seats, I've accidentally busted off the terminals on the thermostat on the drivers seat base cushion on my 99 v70 but when I bypass it the seat does heat ok, but not keen to use it in case in burns the leather. Could I fit one of these relays instead ? Does the black box relay cycle the heat pad off and on every so often ?

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