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I'm also planning to use the device for a retrofit project. I'm going to need to monitor some live data and also some
help from Leon owners whose cars already have the feature I'd like to retrofit, and who have a diagnostics device on hand.
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Hi, everyone
The retrofit project I was talking about in the post above was installing a seat occupancy sensor in the front passenger seat and activating it.
For this, I'm going to buy a sensor, get it installed in the seat and connect it to the airbag control unit, along with the passenger belt latch's cable.
I see those tasks as the easier part of the project.
The hard part is figuring out the coding, because I didn't see anybody who did this before and there didn't seem to be any kind of documentation about it.
Today I checked the long coding of the airbag control unit on a 2014 Golf Highline, which belongs to a friend of mine, using OBDeleven.
Then I compared the data to the data from my car.
The results are like this :
Golf ------ Leon
98 00011001 ------ 98 00011001
CC 00110011 ------ CC 00110011
C0 00000011 ------ C0 00000011
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
5C 00111010 ------ 40 00000010
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
CF 11110011 ------ CC 00110011
00 00000000 ------ 00 00000000
48 00010010 ------ 08 00010000
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
00 00000000 ------ 00 00000000
65 10100110 ------ 65 10100110
There are 18 bytes in the long coding of the airbag control unit.
Fifteen of those are the same in both cars.
Only three bytes are different and a total of six bits look different in those bytes.
Now somehow I need to find out which of those bits correspond to front passenger side seat belt check and seat occupancy check.
Any bit of information about this would be greatly appreciated.
The physical airbag configuration of both cars are the same, I believe.
The only difference should be the passenger side seat belt warning and the seat occupancy sensor.
Six bits of difference in the data looks too much to me, there may be other different features that we don't know about.
And because of the airbag control unit being a safety related thing, I don't want to risk things by updating my unit with the exact data from the other car.
Also it would be great to have more data for comparison from Leon owners who has a diagnostics device, preferably facelifted ones in FR trim, and not the ones with rear seat belt warning feature, because that would bring more complication to the data. I got the data from OBDeleven by taking the screenshots of each byte in the long coding section of airbag control unit, so anyone who's willing to
help can use the same method.
Cheers,
Serdar