Z4 Heated Seat Wiring loom (Retro - Fit Kit)

Fishy Dave · Post by **Fishy Dave** » Mon Aug 07, 2017 7:57 pm

P4K1 wrote: ↑Mon Aug 07, 2017 7:24 pm
Same in uk ,you can by loom at any local bmw dealer

If it were that easy we'd have bought it from the UK. I tried to buy firstly the Z4 retrofit kit and then the X3 kit from a number of UK dealers and made an enquiry to BMW UK: it isn't/wasn't available for order in the UK.

-banned- · Post by **-banned-** » Mon Aug 07, 2017 9:24 pm

Fishy Dave wrote: ↑Mon Aug 07, 2017 7:57 pm
P4K1 wrote: ↑Mon Aug 07, 2017 7:24 pm
Same in uk ,you can by loom at any local bmw dealer
If it were that easy we'd have bought it from the UK. I tried to buy firstly the Z4 retrofit kit and then the X3 kit from a number of UK dealers and made an enquiry to BMW UK: it isn't/wasn't available for order in the UK.

fitted 6 sets to various models , always ordered vyring from local dealer

Fishy Dave · Post by **Fishy Dave** » Mon Aug 07, 2017 9:29 pm

That's good news for others then, which part number are you using?

IRD · Post by **IRD** » Mon Aug 07, 2017 9:46 pm

Using part no: 6110307620. I tried in the UK and at ECS in the USA where Dave sourced his looms and the response was always the same, 'no longer in production' or 'no longer available'. The same was true when I googled it except for one BMW dealer in Lithuania.It is really good news if there is an alternative available.

Lewy · Post by **Lewy** » Sat Aug 12, 2017 8:45 am

Hi Darkangelv2,
Is there any way you could send me the retrofitting instructions for the loom. I just got a z4 3.0 2005 and have all but the loom. I'll try the Lithuania thing but will still need instructions.

Lewy · Post by **Lewy** » Wed Aug 16, 2017 11:11 pm

I managed to order one of these today from Lithuania.

thanks for the heads up.

IRD · Post by **IRD** » Thu Aug 17, 2017 2:29 pm

That's good news. Mine arrived in a few days and were genuine BMW parts. Remember when making your connection to the switch panel that the wiring instructions are for a left hand drive car. Both Marlon's and mine ended up the wrong way round and had to be changed. Not a big problem but hopefully a heads up will save you doing the same thing. Good luck.

Zulu4 · Post by **Zulu4** » Tue Apr 06, 2021 5:46 pm

Reviving an old thread... I've trawled to the end of the internet and I've not been able to find anyone selling the retrofit cable (61110307620).
Anyone else had any luck recently?

If it really is no longer available, would it be possible to use a generic heated seat retrofit kit to connect and work with the OEM Z4 heated seat switches ? i.e. do the Z4 switches somehow alter the resistance in the circuit to control heat, or is it all done through the magic of CANBUS ?

ProfCJJ · Post by **ProfCJJ** » Wed Apr 07, 2021 1:03 am

Zulu4 wrote: ↑Tue Apr 06, 2021 5:46 pm Reviving an old thread... I've trawled to the end of the internet and I've not been able to find anyone selling the retrofit cable (61110307620).
Anyone else had any luck recently?

If it really is no longer available, would it be possible to use a generic heated seat retrofit kit to connect and work with the OEM Z4 heated seat switches ? i.e. do the Z4 switches somehow alter the resistance in the circuit to control heat, or is it all done through the magic of CANBUS ?

I’ve done the same with the same (negative) result

If you don’t have electric seats though, the heated part is controlled through PWM from one of the body control units (I forget which one) which makes me think I could get a generic set work as they too tend to work with PWM to regulate the different settings.

Zulu4 · Post by **Zulu4** » Wed Apr 07, 2021 8:56 am

ProfCJJ wrote: ↑Wed Apr 07, 2021 1:03 am
Zulu4 wrote: ↑Tue Apr 06, 2021 5:46 pm Reviving an old thread... I've trawled to the end of the internet and I've not been able to find anyone selling the retrofit cable (61110307620).
Anyone else had any luck recently?

If it really is no longer available, would it be possible to use a generic heated seat retrofit kit to connect and work with the OEM Z4 heated seat switches ? i.e. do the Z4 switches somehow alter the resistance in the circuit to control heat, or is it all done through the magic of CANBUS ?
I’ve done the same with the same (negative) result

If you don’t have electric seats though, the heated part is controlled through PWM from one of the body control units (I forget which one) which makes me think I could get a generic set work as they too tend to work with PWM to regulate the different settings.

Please keep us updated if you do manage it Christopher.
I wonder if a generic kit with a three-position heat switch, you could just cut this off and wire up to the OEM switch ?
(I have the 2007 E85 model with electric memory seats)

Kendodeal83 · Post by **Kendodeal83** » Wed Apr 07, 2021 2:22 pm

Yes please keep me updated I’m trying to get a loom but it’s a bit of a minefield to know exactly what is required think I may call bmw but they are pretty useless wen it comes to things like this

clarker63 · Post by **clarker63** » Wed Apr 07, 2021 3:15 pm

I dont know about the e85/6 but on the e89 I made the cable, its not that hard, which uses the PWM from the JBBF module (which needs coding). its in here if that helps. I assume there's some similarities

viewtopic.php?p=1363305

Zulu4 · Post by **Zulu4** » Wed Apr 07, 2021 10:54 pm

clarker63 wrote: ↑Wed Apr 07, 2021 3:15 pm I dont know about the e85/6 but on the e89 I made the cable, its not that hard, which uses the PWM from the JBBF module (which needs coding). its in here if that helps. I assume there's some similarities

viewtopic.php?p=1363305

Interesting read. Thanks.
Where did you get the correct size connectors from to make up the cables so that they fit into the existing plugs ?

clarker63 · Post by **clarker63** » Thu Apr 08, 2021 6:49 am

Zulu4 wrote: ↑Wed Apr 07, 2021 10:54 pm Interesting read. Thanks.
Where did you get the correct size connectors from to make up the cables so that they fit into the existing plugs ?

from bmw. I think I posted the part numbers in the thread.. just checked and they are below the first picture I posted.

Zulu4 · Post by **Zulu4** » Thu Apr 08, 2021 10:14 am

Ah, thanks missed that bit.

If I understand you correctly, the variable heat to the mats is controlled by a pulse width modulation of current (via 12v voltage). I'm guessing that the heated seat switch in the car is just providing its position in binary form to a processor, which then switches a small power transistor on and off for the PWM. Am I along the right tracks ?

So, if I could get a generic kit with a 3 position switch (similar to that fitted in an E85), I might be able to fit the kit to the BMW OEM switch instead. Any thoughts on this idea?

Z4-forum.com

Z4-forum.com