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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > E91 Memory Seat Retrofit



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      07-28-2020, 11:53 AM   #1
swiftryanswift
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E91 Memory Seat Retrofit

Firstly, my apologies, this has been discussed a lot over the last 10 years and i've done a lot of research, however people haven't shared their trade secrets. Not all of them at least.

I have an 2010 E91 SE, which has heated seats but no IDrive, I've bought some M sport, heated, leather, electric, memory seats. I want to retrofit them which I understand is possible, but i need a little help. They are from a Pre-LCI car so i need to swap over the airbag headrests.

Starting with my drivers seat, the wiring pins i have available are 1,5,8 & 9. The new seat has K Can, so has 2,3,4,7,8 & 13.

My plan so far is to
- merge pins 8 & 13 on the donor seat and connect to pin 8 of the existing harness. This gives me a ground.
- Connect pin 7 on the donor seat to pin 9 on the existing harness. This should give me bolster power.

It's just what i do with the remaining wires that i get stuck with.
What do i need to do, in order to wire in the rest?
I've attached a wiring diagram to show what is left.
I'm based in Cheshire if anyone wants to come and help? However i would appreciate any advice.

The wires on my harness are 1 PWM Heat & 5 Ignition Plus Heat.
On the seat i have 2 & 3 for the K CAN and 4 for Seat Heat Module.

I could live without memory seats if that simplifies things? But need the seat heating functionality.

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      07-30-2020, 10:57 AM   #2
swiftryanswift
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So further research has given me a strategy to try, but would 100% appreciate input from others

To keep my car connector the same, the work will be done to the donor seat harness
- Join Pins 7 & 4 together (Keep Pin 4 connector)
- Move Pin 4 to Pin 9 location (currently empty)
- Join Pin 13 to Pin 8 (Joint ground wire)
- Connect Pins 2 & 3 into a new Wire Terminal Connector
- Join new connector pins 2 & 3 to nearest K CAN H & L
- Fit the seat.

This will make pins 1 and 5 on the cars existing connector redundant, but as the K Can should be passing the signal for the heat seating that should be okay? Fingers crossed.
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