M-Sport Heated Seat Base - Repair. - Wiki entry added

gookah

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On our recently purchased Z3, and found that the seat base on the drivers side would not heat up, whether on low or high heat,
the car had the M-Sport seats.

So today I carried out the following investigation.

Firstly I removed the seat. Take the key out of the ignition so no airbag issues...
Move the seat forward and remove two rear bolts from the runners with a 16mm socket, and the lower seat belt anchor with a 16mm spanner.
Move the seat backwards and remove two nuts from the runners with a 13mm socket.


Tilt the seat to one side and you will see the yellow connector underneath:


the black retainer slides outwards to the right as pictured:


this releases the connector:


now you can carefully take the seat out completely.


Start by removing the side plastics. One screw here:


one by the tilt lever:


and one at the front of the seat:



then unclip and pull back the fabric flap at the back of the seat:


remove the side flaps by removing the retainer clip:



Now to start unhooking the seat fabric, I bent the small tags out wards to aid removal:




Then I cut the brown and the white wires at the back of the seat base to allow the seat cushion to be removed completely from the frame.
(photo later)


Then I started to peel back the leather to expose the hog rings, which pull apart with some long-nose pliers.These hold the leather to the seat bars underneath.
There are three of them at the front of the seat


and this then exposes the problem:

A burnt and broken wire.
I assume that as the car does not have an electric roof, it was caused by someone kneeling on the seat, probably breaking some of the wire strands causing it to overheat and burn out.


So to effect a repair, I decided to splice another wire in between, to get rid of damaged bits and to allow a better routing of the wire.
So solder two joints and heatshink:




Cut into the foam so it can be sunk and protected:


and the finished repair:


Continuity tried at the cut wires after adding some bullet connectors and joined up before re-assembly:


Reversal of the above to refit:
bend the hog rings and stitch them back on with the pliers:


Hoover the carpet, places you can't get to normally:

and refit the seat:
Switched on, no airbag light, and a fully working seat heater.
Didn't cost a penny, in fact I made 52p... :D

One thing I noticed whist the cover was off, is the reason for the seat bolster being flat:

the foam had parted and no longer held its shape, so a bit of duck tape:


It's not pretty but it does the job perfectly.
 

GazHyde

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Re: M-Sport Heated Seat Base - Repair.

Great write up Pete - I shall transfer it to the Wiki for posterity later this week :-bd
 

z3cade

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Re: M-Sport Heated Seat Base - Repair.

Lucky the car didn't set alight with the look of that wire!!! #:-s
 

swamper

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Re: M-Sport Heated Seat Base - Repair.

good wright up....gona save someone a few quid ;)
 
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badman gee

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Re: M-Sport Heated Seat Base - Repair.

nice job, great effort.
 

Gio

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Re: M-Sport Heated Seat Base - Repair.

Thanks for the great post
I've got exactly the same problem with my drivers seat.
Will have to try and find the time and courage to do that repair.
I'm always very nervous when it come to working on my Z'd especially as it's my daily drive so cant afford to darn anything up.
 

Snoops

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Re: M-Sport Heated Seat Base - Repair.

Excellent write up, good clear step by step pictures... :-bd
 

si-forks

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Re: M-Sport Heated Seat Base - Repair.

Nice write up just need some M seats now !!!

Si-forks on tapatalk
 

BlackBMWs

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Just acquired 3 M seats. No heat at the Buttocks. Will follow the instructions here. Thank you for the nice write up!
 

Shelly

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Fantastic write up :p
Very interesting ;)
 

pgunter

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Great write up and one that I will be trying this summer to sort the seat out in the 3.0 as everything works apart from the seat base. I am also looking to replace the foam base as well as getting a repair done on the leather bolster.

@Oldguysrule one for you to have a look at.
 

Sean d

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Great write up and one that I will be trying this summer to sort the seat out in the 3.0 as everything works apart from the seat base. I am also looking to replace the foam base as well as getting a repair done on the leather bolster.

@Oldguysrule one for you to have a look at.
@pgunter I did this repair but it didn't work as there was another break, I got an after market set of heat pads which you can cut to shape, they work really well.
 

Redline

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Re: M-Sport Heated Seat Base - Repair.

Lucky the car didn't set alight with the look of that wire!!! #:-s
The car may not have lit up but the driver might have :eek:
 

t-tony

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A further tip for anyone doing this repair. Back in the 70's and 80's stripping car seats was a fairly common job and I found an easy way of doing those "Hog rings" was to use 1/16" gas welding rod, you could poke it through the fabric and round the steel rod then use the length of the welding rod to bend it into a ring. Simply cut it off and use it again on the next hole etc.

Tony.
 

Sean d

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A further tip for anyone doing this repair. Back in the 70's and 80's stripping car seats was a fairly common job and I found an easy way of doing those "Hog rings" was to use 1/16" gas welding rod, you could poke it through the fabric and round the steel rod then use the length of the welding rod to bend it into a ring. Simply cut it off and use it again on the next hole etc.

Tony.
Yep, thats what I used pal
 

t-tony

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Thought you probably would have Sean, mind you gas welding rigs are few and far between these days bud.

Tony.
 

oldcarman

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@pgunter I did this repair but it didn't work as there was another break, I got an after market set of heat pads which you can cut to shape, they work really well.
I bought the same set Sean and look forward to a warm butt!! It's snowing right now and expect 5cm by morning!! Welcome to my world!!!! JIM
 
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