Wiring (electric) seat harness on the 89

Post in this forum for topics relating to the interior.

Moderators: GRNSHRK, ron, bfons

Post Reply
Tommys 89 635
Posts: 523
Joined: Mon Oct 30, 2006 8:23 pm
Location: San Mateo, CA just South of San Francisco

Wiring (electric) seat harness on the 89

Post by Tommys 89 635 »

Hi,

I upgraded my electric comforts to the electric sport seats from a 1985. I'd like to add the heated seat/back to them.
So I was wondering if the existing wiring harness in my 89 is the same for heated electric seats or do I need other wiring harnesses for it to work.

Thanks in advance
Tommy
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
User avatar
Ralph in Socal
Platinum Member
Platinum Member
Posts: 2746
Joined: Tue Apr 14, 2009 3:32 am
Location: High Desert of SoCal

Re: Wiring (electric) seat harness on the 89

Post by Ralph in Socal »

There are additional wires under the seat and they may be for the seat heaters. Best to look under your seat and see what's there then research wiring diagrams to see what they're for

I've never come across an e24 with seat heaters so I'm not well versed on the system

Ralph
There is a very fine line between "Hobby" and Mental Illness.

85 635csi Zinno Auto
84 528i Euro
83 635 Euro Arktik
81 528i Kastanien 5-speed
88 528e Bronzit (Granpa Car)
86 535i Auto (For Sale)
81 633 csi (retired)
Tommys 89 635
Posts: 523
Joined: Mon Oct 30, 2006 8:23 pm
Location: San Mateo, CA just South of San Francisco

Re: Wiring (electric) seat harness on the 89

Post by Tommys 89 635 »

Ralph in Socal wrote: Thu Dec 22, 2022 7:49 pm There are additional wires under the seat and they may be for the seat heaters. Best to look under your seat and see what's there then research wiring diagrams to see what they're for

I've never come across an e24 with seat heaters so I'm not well versed on the system

Ralph
Hi Ralph,

I was hoping someone here may have done this in the past.

I looked on realoem, couldn't find the wiring harness for just the electric seats so thinking maybe it might be the same harness used for heated as well.
If that's the case, I would need the switches, relays and seat and back heat elements.

I recall when upgrading the seats from comfort to sports, everything plugged in so I was able to used the controls.

I'll need need to look under the seat for sure to check.

Thanks and happy holidays
Tommy
1989 635 CSI (Second owner since Jun 1995, driven daily and retired in 2013 with 295k to occasional driving)
2011 335D (Daily driver) with 103,550
Post Reply