This topic was a WIP research about how to do the electric seats retrofit. We discovered there are so many car configurations that it's impossible to do 1 guide for all. So, we prefer to share our notes and you must do your own research to validate your car and seats FROM -> TO configs.
**PLEASE read the complete topic before asking question.**
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Reference:
DIY Sport Seat swap into E90 without power seats
http://www.e90post.com/forums/showthread.php?t=229396
Heated Seat Retrofit
http://www.e90post.com/forums/showthread.php?t=192819
Part Numbers: realoem.com
Wiring diagrams:
http://www.bmw-planet.com/diagrams/r.../e90/index.htm
E46 DIY: Power Seat Retrofit w/Memory
http://forum.e46fanatics.com/showthread.php?t=348165
The ZSP Premium powered heated seats are coming with many features and if your car have been delivered with the basic seats, the seat harnesses are not completed for the missing options. So, the first thing to do is to understand the missing wires and adding them to the existing connectors or buying the expensive complete OEM harness from your dealers.
**I have done this DIY on my car but all cars are different so I am not responsible for any issue it can caused. You can use it at your own risk.
There is the list of features that are coming with the new seats:
1-Airbag sensor
2-Seat belt sensor
3-Heating system
4-4 motors for position adjustments
5-Side bolsters
6-Lumbar bolster
So, any seat are coming with at least option 1 and 2. I already have option 3 and I will add the option 4-5-6.
There are a few diagrams that represent how the seat systems are working:
Important information:
-Driver seat' connector is called x275
-Passenger seat' connector is called x279
-K_CAN connector in Junction Box is called x14271
It is important to understand what is the K_CAN. The K_CAN is the way the car is talking to the driver seat module to manage the memory.
So, based on my study there are the steps I have to go through to complete the harness:
1- Adding the K_CAN connection to the driver seat with twisted wire gage #18 - #21
1A- K_CAN H on x275 pin#2 / x14271 pin#46 (or any K_CAN H wiring in the car like the radio, heat or Idrive controler - green/orange wire)
1B- K_CAN L on x275 pin#3 / x14271 pin#10 (or any K_CAN L wiring in the car like the radio, heat or Idrive controler - green wire)
BMW connectors: 61131383776
2- Adding the 30A power on the driver seat with single wire gage #12
2A- 30A (+) on x275 pin#9 / x11006 pin#2 Fuse F37 (or connecting x275 pin#9 on pin#4)
2B- 30A (-) on x275 pin#13 / ground (or connecting x275 pin#13 on pin#8)
BMW connectors: 61138364844
3- Adding the 30A power on the driver seat with single wire gage #12
3A- 30A (+) on x279 pin#9 / x11006 pin#1 Fuse F33 (or connecting x279 pin#9 on pin#4)
3B- 30A (-) on x279 pin#13 / ground (or connecting x279 pin#13 on pin#8)
BMW connectors: 61138364844
4- Option coding is required to activating the memory function with keys
Sorry if the information is raw, I haven't finish my study. Any comments are welcome.
Question to answer if you have any expertise:
-There is a risk to reused the 30A connection from the heating / powered adjustment on the lumbar / side bolster? My understanding is that if the same cable/fuse can support the heating and 4 motors, I don't see why it could not also support the 2 seat pumps. Normally all of these will not work at the same time.
If I reuse the connection, the retrofit will be much easier as I will not have to rewire the passenger seat and playing in the fuse box.
(To be continued soon..)