[firsttofallgo]

Hi, I'm new to the world of Smart and just picked up an '06 CDI for a winter beater project. I just fixed the EGR issues now onto the airbag light.
According to my Autel Autolink scanner I'm pulling up a code

B0049 "Child seat lock recognition has an open circuit, short circuit to positive, or has high-impedance".

The car does not have the child seat rails installed, is it possible a previous owner did and pulled it out and didn't reset the computer?
I keep trying to clear the code with the scanner but it always pops back up.

I have some 2.2ohm resistors I may try and see if I can test on the passenger seat to trace any sensor issues.
Is there a seat occupancy sensor in the seat of a 450 or just the side airbag wire?

Has anybody else ever come across this code? I've searched the forums and haven't seen anything.

Thanks for any guidance!

 

[vadsoom]

I don’t have a 450 or access to one, but if it operates similarly to the 451, if the car is turned on while any airbag component is unplugged (including indicator lamps), a fault code is generated and requires a high-end scan tool or Mercedes Star Diagnostic to clear.

The B0049 code does not appear in my reference manual, but is a manufacturer specific code. I suspect the reader you have is either reading the incorrect code or interpreting the code incorrectly.

Do you know anyone that might have access to a Star diagnostic? That would be the best way to know for sure.

 

[firsttofallgo]

I just tried with a 2.2ohm resistor on the child seat sensor plugs hidden under the carpet of the passenger seat. This causes the code to change to

B0047 Child seat lock recognition has a short circuit to ground or us low-impedance.

I will try and see if I can get up to 400ohm resistance as per the Evilution faq on child seat installation and see if it changes the error code.

 

[firsttofallgo]

400ohm resistor fixed it! 150ohm and it thinks the car seat mounts are rotated in. 400ohm and it thinks the car seat mounts are up and an adult is sitting there

 

[vadsoom]

Please be very careful in considering modifications to the airbag system. A misfire or altered deployment could seriously injure or even kill someone.