I did notice that one pin wasn't fully clicked into the plug but I didn't want to push it all the way in in case it was one of the ones that needed to be swapped
Ok, so I’m struggling with the wiring. On the mk3 loom 6 pin connector, pins 2 and 3 are looped and look to grounds. Here’s what I have: Mk3 loom plug to cut off once I cut the plug off do I need the loop? What wires from the mk3 loom splice into the mk5 loom?
I'm really not good at this stuff, I'm not sure how I'm going to go from the mk3 loom to the mk5 plug. Do I cut the mk3 loom off before the relay or do I cut the loom off after the relay
personlly I'd try and get a mk3 mating plug and splice that to the MK5 seat plug you have there, then that means the mk3 loom you have is standard, and the mk5 seats are unmodified as well. trouble is sourcing the mk3 plugs can be tricky but not too bad if you have a decent scrappy local you can check the rear wiring looms and maybe the electric window loom for one you need to keep the relays if you want any chance of the system working as it should, if the mk5 thermistor is the wrong spec you may need to source mk1/2/3 seat pads to dig the thermistor out
So is there another mk3 plug? I thought after the relay harness it would plug into the heating pads next. I'm getting confused, but that's not hard to do when it comes to electrics. I have looked at all the wiring diagrms RJ has posted an I just suck at reading those things. Is there anyway to make it a bit dumber form me? Here's a list of what I have: Mk2 heated seat duel switch mk3 heated seat loom from switch to mk3 relay loom - from kuffatec 1 mk3 heated seat relay loom - used from ebay mk5 heated seat chassis pigtail mk5 edition 30 heated seats
last pic is the mk3 golf diagram, the one I posted earlier was the mk5 golf. the plug you're looking at cutting off is where the mk3 heat pads plug in, if you had a set of mk3 pads you would just cut that plug off and splice to the mk5 seats job done, potentiality digging out the thermistor later if the mk5 golf one isnt compatible with the mk3 relays and mk2 switch. Since you dont have the pads you either source a mating plug from elsewhere or just chop it off and splice the mk5 mating plug on as you mentioned earlier you need 2 relays though by the way, one per seat
Ah, ok. I haven't been able to find the mk3 pigtail so I going to be using the mk5 connector. I know the thermistors might be different but I'll take that chance. What I havnen't been able to figure out is what wires do what. mk3 plug pins: 1. brown - backrest pad heater earth 2. brown - backrest pad heater power 3. brown - seat pad heater power 4. black - seat pad thermistor signal 5. blue- seat pad thermistor earth 6. brown/black - seat pad thermistor earth This is correct right? mk5 plug pins driver seat: Pin 4. Black/blue - Pin 5. Brown - Pin 8. Red/black - Pin 10. Violet/blue - I have no idea what these do, but I assume it's some kind of magic I do know I need another relay loom I just haven't gotten it yet, thanks for looking out though. Also the passenger seat mk5 loom has more pins so I'll address that when needed.
1 - backrest pad earth 2 - backrest pad live 3 - base pad earth 4 - base pad live 5 - thermistor signal 6 - thermistor earth for the mk5 seat, you need to dig under there to find the control unit. the pads are wired to that, the big 10 pin plug you have there doesnt have the pad wires on it just the main power and earth plus signal from switch
no the mk1/2/3 relay will take over that function. just need to source another one for the other side
Ok, so I think I might have figured it out. So the violet/blue wire gets spliced into 2 green wires. The green wires go into the plugs for the upper and lower heat pads. The blue/black wire goes to the upper seat pad, with a green wire, so I think that’s my loop from the mk3 loom. The red/black wire looks to power the lumbar power. Does this sound right?
yep the 4 and 2 pin plugs connect to the heated seat pads, which is the equivalent to the 6 pin plug on the MK3 looms. As you have both sides its an easy job to splice the mk5 2/4 pin plug to the mk3 6 pin wiring then you're good to go (once you get the other relay, and assuming the mk5 thermistor is compatible) I can try and find the diagram for the lumbar support if you want that to work, it might be easy as wiring in a push switch or as complicated as wiring up a control relay somehow
I'm gonna run to the scrappy at lunch and grab the 4 and 2 pin plugs from the car I got the pigtails from and use them to splice and connect to the mk3 loom. For the lumbar I'm gonna try to just run power to it before I put the seats in and see if that works, if it does then I can get power from the fuse box. If it doesn't work then oh well, no big deal
are all the switches on the seat? if so looking at the diagram its easy peasy put live to the red/black and earth the brown jobs a goodun
Ok, one last information check before I start cutting things. four pin plug: brown is ground Green power to backrest Black/blue thermistor Brown thermistor ground 2 pin plug Brown ground Green power to seat base-looped to pin 2 on 4 pin plug then on the the mk3 relay 4 pin plug I can take power for the lumbar switch from the red wire
