seat occupancy code

[Clavurion]

Originally Posted by Henn28

Unfortunately they’ve just been reupholstered and I’m getting the code after swapping them in. I suspect my module is looking for the separate sensor that mounts under the seat and connects between the mat and the car. My car is a 2002 and the seats came from a 2006 (I believe). They don’t have this separate small box. Just ran an inpa sweep and came up with (thanks google translate):
112 seat occupancy determination
Error currently present
Line against plus
Error not sporadic

So yep, seems like the sensor pad is shorting.

Inpa also shows the “see built in” as “yes”. Which tells me the module is smart enough to see that the small box isn’t present on the model seal I swapped in, and it’s just reading a short in the mat.

I understood they are just reupholstered. Just for future reference to someone doing the same I mentioned that the seat mat would be wise to renew at that point.

Every E53 has that small module for seat mat at rear bottom of the seat base. Even my 9/2006 manufactured does. So I don't know why it was missing on your seat.

[Henn28]

Originally Posted by Clavurion

I understood they are just reupholstered. Just for future reference to someone doing the same I mentioned that the seat mat would be wise to renew at that point.

Every E53 has that small module for seat mat at rear bottom of the seat base. Even my 9/2006 manufactured does. So I don't know why it was missing on your seat.

I agree completely. Wish I would have researched that aspect of my seat project a bit more, but waddya going to do. Not the first time I’ve had to find a work around. Also, RealOEM lists the some of the sensor pads as discontinued.

I did sort out that the seats are from an E70. I thought they were from a 2006 facelifted E53 but the lack of the small module under the seat and the fact that the system has 3 wires (versus 2) that dont match the colors in my Bentley wiring diagrams, threw me off. I recalled however, that I have a BMW wiring diagram app on my phone and after some searching, voila…e70 matches.

So that said, what to do? Guy in Lithuania sells e70 occupancy emulators, which are cheap and I’ll probably order one as a backup. No small kids or car seats will be in the front seat the x5 unless I’ve picked up a random family and we are all fleeing zombie hordes.

Not my first choice though as I’d rather re-program the module to simply ignore the occupancy pad. This is definitely possible with NCS so I watched a few videos yesterday and plugged in to the beast with a sense of optimism that I was finally going to start learning to code my BMW. While INPA worked like a champ, I didn’t get past the module loading step on NCS Dummy, which tells me that my VIN is incorrect, or something like that. I put a call into my Indy to see if he had any experience with this stuff and would take a crack at it.

My new foxwell 710 does have some occupancy sensor programming options, but they quickly got complicated as I worked through the menus, so I’m going to do some additional research before trying this.

If we wanted easy we’d buy Toyotas.

[andrewwynn]

If you have e70 seat and e53 you need e53 seat emulator.

At least now it makes sense and correct no way you can get a new oem butt sensor for 18-25 year old car

[Henn28]

Originally Posted by andrewwynn

If you have e70 seat and e53 you need e53 seat emulator.

At least now it makes sense and correct no way you can get a new oem butt sensor for 18-25 year old car

I agree, except that I’m not sure how that would work… the e70 plugs are 3 pin/wire and the e53 plugs are 2 wire, that run into either side of the little sensor box under the seat. The e70 seats don’t have the little box.

It looks to me that the e70 seat wiring has a neutral added as the third wire that the e53 seat wiring doesn’t have.

Absolutely unrelated Andrew, but do you know if TIS has m62 rebuild data and information, like crank/cam bearing and other tolerances especially?

[Clavurion]

Originally Posted by andrewwynn

At least now it makes sense and correct no way you can get a new oem butt sensor for 18-25 year old car

What do you mean?

https://www.hubauer-shop.de/en/senso...776921952.html

https://www.leebmann24.com/fi/de/pro...nnung-10395050

[andrewwynn]

I stand corrected. I should have been more clear to say id be shocked (true) if it's available.

[andrewwynn]

Originally Posted by Henn28

I agree, except that I’m not sure how that would work… the e70 plugs are 3 pin/wire and the e53 plugs are 2 wire, that run into either side of the little sensor box under the seat. The e70 seats don’t have the little box.

It looks to me that the e70 seat wiring has a neutral added as the third wire that the e53 seat wiring doesn’t have.

Absolutely unrelated Andrew, but do you know if TIS has m62 rebuild data and information, like crank/cam bearing and other tolerances especially?

I think you are thinking of some adapter to use the e70 seat sensor in e53. That might be possible if the right conditions prevail but the normal fix is a fake seat sensor based on thr car.

Start a thread about rebuild info i can look into it.

[BimmerBreaker]

Seats looks great!

Is there any chance the seat bases got mixed up and the driver's seat now has the occupancy sensor?

Originally Posted by Henn28

Absolutely unrelated Andrew, but do you know if TIS has m62 rebuild data and information, like crank/cam bearing and other tolerances especially?

TIS does have this information. The repair procedure references a table which tells you what size bearings to use based on plastigauge measurements. It even lists a permissible deviation in weight from one rod to another.

[Henn28]

Originally Posted by BimmerBreaker

Seats looks great!

Is there any chance the seat bases got mixed up and the driver's seat now has the occupancy sensor?

So freaking comfortable, thanks again for the cloth, it was the right way to go. I love the “heritage” look and will definitely repeat it on whatever I end up building to out my 4.4 into.

I did t think that the seats could be reversed. I’ll definitely though. That would take the seat belt tensioners being reverseable (right?) and my upholstery guy pulling them off and then putting them back on the wrong way. Definitely possible to do, assuming that it’s physically possible.

Will check today.

[Henn28]

Originally Posted by andrewwynn

I think you are thinking of some adapter to use the e70 seat sensor in e53. That might be possible if the right conditions prevail but the normal fix is a fake seat sensor based on thr car.

Start a thread about rebuild info i can look into it.

Willdo...I posted some pics from the initial teardown on the Overland thread, but should probably start an M62 rebuild thread so as not to hijack the overland posts.

So far the motor looks great, especially the bores. A little polishing in them is all I see, but no scoring of any sort that I can feel with my finger/nail. I'm thinking it is most likely then that the low compression I was seeing in two cylinders is from rings or valves. I'll put new rings in it, and lap the valves as part of the process.

I've decided to put 4.6 cams into my heads and build what will essentially be a 4.4 with the 4.6 top end. I'm thinking that 80 or 90% of the 4.6's added HP comes from the heads anyway and putting the rebuild motor into something like an E36 will make for a nice project and a monster when it is done. Maybe 320-330ish HP?

The only difference between the 4.4 and 4.6 heads are the cams and the springs. I've found and bought a set of 4.6 cams, thanks to a forum member, and am looking for a set of 4.6, or aftermarket springs without having to buy the heads too (since mine are in good shape).

New 4.6 springs are available from BMW, but aren't cheap when multiplied by 32. I have one spring on order, along with the retainers, seal and locks so that I can weigh and measure it all, and then try to find a similar and cheaper alternative that will work.

I'm expecting to need new bearings on the crank, at a minimum.