Electric Seat lumbar adjust and side bags not working

[mcbutler]

Hello all,
2009 35i 45k miles
Car has the full electric seat option fitted.
Seats adjust in all directions correctly
Seat heating works correctly
lumbar adjust and the internal inflating side supports are not working.
I have looked at the joke of a fuse map which is useless.
So anyone know which fuse it is or have any other ideas regarding the issue??

 

[AnubisZed]

Give fuse 20 a check, as that controls all of that

 

[mcbutler]

Give fuse 20 a check, as that controls all of that

Nice one Dave - where did you find this cct diagram??

 

[AnubisZed]

Give fuse 20 a check, as that controls all of that

Nice one Dave - where did you find this cct diagram??

I still have full access to newTIS :wink:

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0

 

[mcbutler]

Give fuse 20 a check, as that controls all of that

Nice one Dave - where did you find this cct diagram??

I still have full access to newTIS :wink:

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0

you are a super star Dave, many thanks - invaluable info

 

[Bombur]

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0


You dont by any chance have a dropbox link for a 2009 2.3 do you??

 

[AnubisZed]

Nice one Dave - where did you find this cct diagram??

I still have full access to newTIS :wink:

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0

you are a super star Dave, many thanks - invaluable info

No problem, always happy to help

 

[AnubisZed]

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0


You dont by any chance have a dropbox link for a 2009 2.3 do you??

Don't think I could fit a whole car in there

 

[flybobbie]

Found the inflating side bolster not much use. Now i wish whilst i had seat apart move the air bags to be lumbar support.

 

[mcbutler]

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0


You dont by any chance have a dropbox link for a 2009 2.3 do you??

Don't think I could fit a whole car in there

How do you find anything in this document Dave? I habve searched for FUSE - FUSE PANEL - LUMBAR etc etc but nothing relevant appears and searching page by page would take a lifetime i think

 

[B21]

F20

https://youtu.be/YkZsG2INkM8?si=B2s5VZfXiJFetFdT

You should have a fuse card

 

[AnubisZed]

But I also have this.... https://www.dropbox.com/scl/fi/q5f9tc87iljnmcmsoiem9/BMW-Z4-2.8i3.0i3.5i3.5is-2009-2016-Workshop-Repair-Service-Manual.pdf?rlkey=x9w2x6fvcmi5s1axbd7jlnk4b&st=qfa8wpbc&dl=0


You dont by any chance have a dropbox link for a 2009 2.3 do you??

Don't think I could fit a whole car in there

How do you find anything in this document Dave? I habve searched for FUSE - FUSE PANEL - LUMBAR etc etc but nothing relevant appears and searching page by page would take a lifetime i think

Yeah, it's not user friendly.
The wiring diagrams start from page 6332, and are in sections, so the pages you'd need for that are 6395 & 9396

 

[mcbutler]

Don't think I could fit a whole car in there

How do you find anything in this document Dave? I habve searched for FUSE - FUSE PANEL - LUMBAR etc etc but nothing relevant appears and searching page by page would take a lifetime i think

Yeah, it's not user friendly.
The wiring diagrams start from page 6332, and are in sections, so the pages you'd need for that are 6395 & 9396

Everything after page 6008 is just black on my copy!!!

 

[AnubisZed]

I'd redownload it.
I downloaded it at work this morning to get the page numbers and it was fine, so I'd start again

 

[DonDon]

@Dave, I've just downloaded it from that link and it stops at page 6985, the same as the copy I downloaded from your link in May 2023.

 

[mcbutler]

I'd redownload it.
I downloaded it at work this morning to get the page numbers and it was fine, so I'd start again

Well fuse 20 aint the problem, passenger seat is working fine, drivers seat makes all the right noises but nothing happens at all.
The actuators seem to be in the back of the backrest, have you ever opened a seat up Dave?
Seems fairly straightforward...

 

[AnubisZed]

I'd redownload it.
I downloaded it at work this morning to get the page numbers and it was fine, so I'd start again

Well fuse 20 aint the problem, passenger seat is working fine, drivers seat makes all the right noises but nothing happens at all.
The actuators seem to be in the back of the backrest, have you ever opened a seat up Dave?
Seems fairly straightforward...

No, not exactly, but yes they are relatively straightforward to dissassembly.
So if you can hear something working then at least you know that the electrical side of it is OK, so it's down to a physical connection soemwhere.

 

[Chippie]

I'd redownload it.
I downloaded it at work this morning to get the page numbers and it was fine, so I'd start again

Well fuse 20 aint the problem, passenger seat is working fine, drivers seat makes all the right noises but nothing happens at all.
The actuators seem to be in the back of the backrest, have you ever opened a seat up Dave?
Seems fairly straightforward...

Mark, If you wouldn’t mind doing a how to with some photos when you get round to having a look, I’m sure it would help others, it would certainly help me as my drivers seat bolsters don’t seem to move but I can hear the motor going.

 

[Usel]

I'd say you have an airbag leak between the pump and the valves.

 

[mcbutler]

I believe you may be right, and a huge thanks for the photo, very helpful