2014 535d headrest wiring

[kjr92]

Hey all,

I have a code 930538 active on my 2014 535dx with comfort seats. I can't get ISTA to connect with my enet cable to get any further diagnostic info. Can anyone help me out with a diagram of the seat harness so I can trace the wiring to the headrest charge canister and see where my wiring problem might be? The code will clear with bimmerlink and then comes back after a short drive so figure it's gotta be a wiring issue. I assume it goes down to the yellow connector under the seat but no idea which pins are for what. Much appreciated if anyone can give a hand. 

Thank you

[TheNine90]

hello. Which side are you looking for?

[kjr92]

hello. Which side are you looking for?

Hello, woops forgot to add it is the driver seat headrest. Thank you!

[TheNine90]

A93 Driver's seat module
Connector location views
Number X-pin, colour Description
A93*1B 26-pin, black Component connector Driver's seat module
A93*2B 22-pin, black Component connector Driver's seat module
A93*3B 8-pin, black Component connector Driver's seat module
A93*4B 4-pin, black Component connector Driver's seat module
A93*5B 4-pin, natural Component connector Driver's seat module
A93*6B 6-pin, black Component connector Driver's seat module
A93*7B 12-pin, black Component connector Driver's seat module
A93*8B 8-pin, black Component connector Driver's seat module

Pin assignments at plug connector A93*1B
Pin Type Description /Signal type Connection /Measuring information
1 -- Not used
2 -- Not used
3 E Ground, Hall sensor Backrest angle adjustment drive, driver's seat
4 E Ground, Hall sensor Drive, headrest height adjustment, driver's seat
5 E Ground, Hall sensor Backrest head adjustment drive, driver's seat
6 E Ground, Hall sensor Backrest width adjustment drive, driver's seat
7 A Activation Backrest angle adjustment drive, driver's seat Backrest angle adjustment drive, driver's seat
8 A Activation Drive, headrest height adjustment, driver's seat Drive, headrest height adjustment, driver's seat
9 A Activation Backrest head adjustment drive, driver's seat Backrest head adjustment drive, driver's seat
10 A Activation Backrest width adjustment drive, driver's seat Backrest width adjustment drive, driver's seat
11 -- Not used
12 -- Not used
13 E Hall sensor signal Backrest angle adjustment drive, driver's seat
14 E Hall sensor signal Drive, headrest height adjustment, driver's seat
15 E Hall sensor signal Backrest head adjustment drive, driver's seat
16 E Hall sensor signal Backrest width adjustment drive, driver's seat
17 -- Not used
18 -- Not used
19 -- Not used
20 -- Not used
21 -- Not used
22 -- Not used
23 A Activation Backrest angle adjustment drive, driver's seat Backrest angle adjustment drive, driver's seat
24 A Activation Drive, headrest height adjustment, driver's seat Drive, headrest height adjustment, driver's seat
25 A Activation Backrest head adjustment drive, driver's seat Backrest head adjustment drive, driver's seat
26 A Activation Backrest width adjustment drive, driver's seat Backrest width adjustment drive, driver's seat

Pin assignments at plug connector A93*2B
Pin Type Description /Signal type Connection /Measuring information
1 A Activation Seat depth adjustment drive, driver's seat Seat depth adjustment drive, driver's seat
2 A Activation Drive unit, driver's seat angle adjustment Drive unit, driver's seat angle adjustment
3 A Activation Drive unit, driver's seat height adjustment Drive unit, driver's seat height adjustment
4 -- Not used
5 A Activation Drive unit, driver's seat forward/backward adjustment Drive unit, driver's seat forward/backward adjustment
6 E Ground, Hall sensor Seat depth adjustment drive, driver's seat
7 E Ground, Hall sensor Drive unit, driver's seat angle adjustment
8 E Ground, Hall sensor Drive unit, driver's seat height adjustment
9 E Ground, Hall sensor Drive unit, driver's seat forward/backward adjustment
10 E Hall sensor signal Seat depth adjustment drive, driver's seat
11 E Hall sensor signal Drive unit, driver's seat angle adjustment
12 E Hall sensor signal Drive unit, driver's seat height adjustment
13 E Hall sensor signal Drive unit, driver's seat forward/backward adjustment
14 A Activation Seat depth adjustment drive, driver's seat Seat depth adjustment drive, driver's seat
15 A Activation Drive unit, driver's seat angle adjustment Drive unit, driver's seat angle adjustment
16 A Activation Drive unit, driver's seat height adjustment Drive unit, driver's seat height adjustment
17 -- Not used
18 A Activation Drive unit, driver's seat forward/backward adjustment Drive unit, driver's seat forward/backward adjustment
19 -- Not used
20 -- Not used
21 -- Not used
22 -- Not used

Pin assignments at plug connector A93*3B
Pin Type Description /Signal type Connection /Measuring information
1 -- Not used
2 -- Not used
3 -- Not used
4 E/A LIN bus signal Seat adjustment switch cluster, driver's side
5 E/A K-CAN bus signal Bus connection
6 E/A K-CAN bus signal Bus connection
7 E Power supply, terminal 30B Junction box
8 M Ground Ground point

Pin assignments at plug connector A93*4B
Pin Type Description /Signal type Connection /Measuring information
1 A Activation Driver's seat cushion heating Driver's seat cushion heating
2 -- Not used
3 E Signal Temperature sensor Driver's seat cushion heating
4 M Ground Driver's seat cushion heating Driver's seat cushion heating

Pin assignments at plug connector A93*5B
Pin Type Description /Signal type Connection /Measuring information
1 M Ground Driver's seat backrest heating Driver's seat backrest heating
2 E Signal Temperature sensor Driver's seat backrest heating
3 A Activation Driver's seat backrest heating Driver's seat backrest heating
4 -- Not used

Pin assignments at plug connector A93*6B
Pin Type Description /Signal type Connection /Measuring information
1 M Ground Fan, seat Fan, seat
2 M Ground Fan, backrest Fan, backrest
3 A Voltage supply Fan, seat Fan, seat
4 A Voltage supply Fan, backrest Fan, backrest
5 A Activation Fan, backrest Fan, backrest
6 A Activation Fan, seat Fan, seat

Pin assignments at plug connector A93*7B
Pin Type Description /Signal type Connection /Measuring information
1 -- Not used
2 -- Not used
3 E Ground Drive for driver's seat lumbar support Drive for driver's seat lumbar support
4 A Voltage supply Drive for driver's seat lumbar support Drive for driver's seat lumbar support
5 E Ground Valve block, driver's lumbar support Valve block, driver's lumbar support
6 A Lumbar support activation Valve block, driver's lumbar support
7 -- Not used
8 -- Not used
9 -- Not used
10 A Lumbar support activation Valve block, driver's lumbar support
11 A Lumbar support activation Valve block, driver's lumbar support
12 A Lumbar support activation Valve block, driver's lumbar support

Pin assignments at plug connector A93*8B
Pin Type Description /Signal type Connection /Measuring information
1 -- Not used
2 -- Not used
3 -- Not used
4 -- Not used
5 -- Not used
6 -- Not used
7 -- Not used
8 -- Not used

---

The airbag wiring is separate from the seat module wiring above