Help with heated seat wiring

[Sean d]

Guys, car electrics is a real weakness of mine and I have spent a lifetime running away from them, now I'm a bit stuck with the M seats, sorted the relay today and the switches are now lighting up however I have 2 connector blocks in the loom and only one on the seat bases, the seats have been doctored in the past as you can see the heat pad wires are black and red and connected to screw joints, where should these go,
Thanks

 

[MRH1966]

@Sean d My pads had a red & black wire from each pad. Out of the floor I had two connector blocks, one white ,the other black. Black had 4 wires into it, 2 brown (earth) and 2 stripped (Live feeds) All I done was 2 blacks from pads to browns and each red to striped cable.Maybe able to work it out from this??

 

[MRH1966]

That white plug my be the seat motors one???

 

[Sean d]

@Sean d My pads had a red & black wire from each pad. Out of the floor I had two connector blocks, one white ,the other black. Black had 4 wires into it, 2 brown (earth) and 2 stripped (Live feeds) All I done was 2 blacks from pads to browns and each red to striped cable.Maybe able to work it out from this??

I was hoping that was the case, makes perfect sense, even to me

 

[MRH1966]

Not my strong point either!!! but all work ok on test run with horn relay.......just waiting for new relay to turn up......

 

[Sean d]

Not my strong point either!!! but all work ok on test run with horn relay.......just waiting for new relay to turn up......

I'll get a multi meter tomorrow and test the black plug, thanks again

 

[Brian H]

@Sean d

Looking at a wiring diagram for 1998 M Seats the following is shown for the heated seats.

The drivers seat should have the following wires: -
Seat Base - brown and white/red
Seat Back - brown and white/green

The passenger should seat should the following wires: -
Seat Base - brown and white/yellow
Seat Back - brown and white/blue

The cables with the chocolate block connectors on look a little too think for the seat heating for my liking, any more pics of the wiring?

 

[Sean d]

@Sean d

Looking at a wiring diagram for 1998 M Seats the following is shown for the heated seats.

View attachment 87678 View attachment 87676

The drivers seat should have the following wires: -
Seat Base - brown and white/red
Seat Back - brown and white/green

The passenger should seat should the following wires: -
Seat Base - brown and white/yellow
Seat Back - brown and white/blue

The cables with the chocolate block connectors on look a little too think for the seat heating for my liking, any more pics of the wiring?

Thanks Brian, I would think they are after market seat pads

 

[Brian H]

Thanks Brian, I would think they are after market seat pads

Perfect, this makes sense