Active Backrest Retrofit
10-25-2011, 04:03 PM
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My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
Project: Active Backrest Retrofit
See the teaser thread here: http://forums.5serie...s-next-project/
Active Backrest is an option for the Comfort Seats where the backrest can be set with a Comfort, Normal, and Sport mode
It was only available with option 456 (Comfort Seat) and was not available with 455 (Active Seats - this is the one that massages your bottom)
I have only seen evidence of it exisiting in M5s but if anyone has actually seen it in anything else please let me know.
So what does it do?
Active Backrest monitors the DSC information and automatically adjusts the backrest on the outside of the turn to tighten up and support the driver/passenger during cornering.
The new buttons shown below. I will first do the install without installing the buttons to see that it can be made to work without the expense of the new buttons. I expect it can be controlled completely through the iDrive controller.
My seat on the bench. It is backin the car now, just took it out to inspect.
https://mpuddq.dm2301.livefilestore....&cropmode=none
Some of the controller connections
The exisitng backrest motor that needs to be replaced
My test jig. What you see here is 2 motors for 1 seat - left side and right side. I plan to modify the jig to mount the other 2 motors to represnt both driver and passenger seats during testing
The plan:
1) Create the cable harnesses for the seat
2) Create or update the harness from the car
3) Connect Jig to car - code the car - test jig operation during a drive
4) Remove seats again. Remove existing motor from seat. Install 2 new motors per seat with new wire harness. Install seats
I will consider making additional harnesses in the process that I will make available to purchase if it looks like there is interest.
The parts for this retrofit cost about $900USD and I can provide the retrofit harness (assuming I get all this to work!).
I will wait before I am ready to declare the price of the retrofit harness until it is done. Each retrofit kit requires ~100 connections to be made depending on the availability of compatible plugs to mate with exisitng plugs. If I can't find a mate then I will have to remove existing plugs and replace them also.
Not sure how this retrofit $ compares to the original option price but if you like your exisitng seats this is better than swapping out the whole seat for M5 seats.
See the teaser thread here: http://forums.5serie...s-next-project/
Active Backrest is an option for the Comfort Seats where the backrest can be set with a Comfort, Normal, and Sport mode
It was only available with option 456 (Comfort Seat) and was not available with 455 (Active Seats - this is the one that massages your bottom)
I have only seen evidence of it exisiting in M5s but if anyone has actually seen it in anything else please let me know.
So what does it do?
Active Backrest monitors the DSC information and automatically adjusts the backrest on the outside of the turn to tighten up and support the driver/passenger during cornering.
The new buttons shown below. I will first do the install without installing the buttons to see that it can be made to work without the expense of the new buttons. I expect it can be controlled completely through the iDrive controller.
My seat on the bench. It is backin the car now, just took it out to inspect.
https://mpuddq.dm2301.livefilestore....&cropmode=none
Some of the controller connections
The exisitng backrest motor that needs to be replaced
My test jig. What you see here is 2 motors for 1 seat - left side and right side. I plan to modify the jig to mount the other 2 motors to represnt both driver and passenger seats during testing
The plan:
1) Create the cable harnesses for the seat
2) Create or update the harness from the car
3) Connect Jig to car - code the car - test jig operation during a drive
4) Remove seats again. Remove existing motor from seat. Install 2 new motors per seat with new wire harness. Install seats
I will consider making additional harnesses in the process that I will make available to purchase if it looks like there is interest.
The parts for this retrofit cost about $900USD and I can provide the retrofit harness (assuming I get all this to work!).
I will wait before I am ready to declare the price of the retrofit harness until it is done. Each retrofit kit requires ~100 connections to be made depending on the availability of compatible plugs to mate with exisitng plugs. If I can't find a mate then I will have to remove existing plugs and replace them also.
Not sure how this retrofit $ compares to the original option price but if you like your exisitng seats this is better than swapping out the whole seat for M5 seats.
Last edited by NoQuarter; 09-24-2017 at 08:56 AM. Reason: fixed photobucket pics
10-28-2011, 10:13 AM
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My Ride: 2004 BMW E60 525dA - Comf. seat, Hi-Fi Logic7, Navi prof, carphone prof, seat ventilation, Dynamic Drive, Active steering ++ Retrofits:- 9x20 & 10x20 BMW Style 101 w/ 255/30 ZR20 and 305/25 ZR20- 35/35 H&R sport springs - M-sport package- M5 trunk li
Cool project. Keep us updated!! 
12-24-2011, 07:37 AM
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My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
Update: This project is still in progress. I let it wait a while longer to do as a winter project.
Working on the seat harness at the moment but still have some parts on back-order. no delivery date yet
Working on the seat harness at the moment but still have some parts on back-order. no delivery date yet
01-29-2012, 10:53 AM
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My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
Updates:
- The wire harness is 99% complete. Just the final connections to make between the seat controller and the car power and pt_can bus.
Harness bundle.
This pic shows the plug removed from the Body Gateway Module with pics removed for pt_can and 15wake-up
My adapters for connecting to pt_can and 15wake-up
Plugs wrapped up with tape
My adapter pins inserted back into the BGM plug
All wrapped up.
Attached back to BGM
- The wire harness is 99% complete. Just the final connections to make between the seat controller and the car power and pt_can bus.
Harness bundle.
This pic shows the plug removed from the Body Gateway Module with pics removed for pt_can and 15wake-up
My adapters for connecting to pt_can and 15wake-up
Plugs wrapped up with tape
My adapter pins inserted back into the BGM plug
All wrapped up.
Attached back to BGM
01-29-2012, 12:06 PM
#6
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pff ,thats easy
even a cave man can do it
the only problem ..is...there is no more cave man ALIVE
)
looking to see the final results..
even a cave man can do it
the only problem ..is...there is no more cave man ALIVE
)looking to see the final results..
01-31-2012, 07:23 AM
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My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
It is just like any other option that is added to the car as a retrofit. it will require coding for the new modules to be recognized and for the interface to display on the iDrive screen.
01-31-2012, 10:42 AM
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Great DIY write up! Congrats on your progress!
I just checked my 06 option list and see that I have option 456 installed (full electric comfort seats), If I where interested in doing this retrofit, would I need to do the exact same thing you are doing, or is it just a case of coding in my case?
Looking forward in your reply.
Keep up the good work!
I just checked my 06 option list and see that I have option 456 installed (full electric comfort seats), If I where interested in doing this retrofit, would I need to do the exact same thing you are doing, or is it just a case of coding in my case?
Looking forward in your reply.
Keep up the good work!
01-31-2012, 12:04 PM
#10
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My Ride: 2007 530xi: Sport, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, HD Radio, SAT, Custom NCS coded options 2008 535xi: Sport, Night Vision, NAV, PDC, HUD, Cold Wthr, CA, Logic 7, SAT, Custom NCS coded options, Rear Seat Heat Retrofit, Passport 9500ci
Model Year: 2008
Engine: N54
Great DIY write up! Congrats on your progress!
I just checked my 06 option list and see that I have option 456 installed (full electric comfort seats), If I where interested in doing this retrofit, would I need to do the exact same thing you are doing, or is it just a case of coding in my case?
Looking forward in your reply.
Keep up the good work!
I just checked my 06 option list and see that I have option 456 installed (full electric comfort seats), If I where interested in doing this retrofit, would I need to do the exact same thing you are doing, or is it just a case of coding in my case?
Looking forward in your reply.
Keep up the good work!
You would need to do what I am doing.