SRS/Airbag problem

[Bizonscunny]

Hi,
maybe somebody could help me to clarify some issues with my annoying airbag/SRS light.

Read Codes
B106B Stored
Component B48 (Front passenger seat occupied and child seat recognition) has only detected one transponder.
B2D92 Stored&Current
Control unit N2/7 (Restraint systems control unit) is defective.

B106B Component B48 (Front passenger seat occupied and child seat recognition) has only detected one transponder.
Fault frequency 4

Operating hours up to first 3025.96 h
occurrence of fault

Operating hours up to 3061.64 h
disappearance of fault For
current faults, value 9320.67 is displayed.


B2D92 Control unit N2/7 (Restraint systems control unit) is defective.
Fault frequency 46

Operating hours up to first 3455.38 h
occurrence of fault

Operating hours up to 9320.67 h
disappearance of fault For
current faults, value 9320.67 is displayed.
The light come ON once sometime ago and then disappeared after minute or so, lately it came again and stays since then.
I really do not want to start with components replacement. Looking on fault frequency I assume that it may be some loose connection, or am I wrong?

W203 C200 Kompressor 53 plate

Any suggestions?

 

[davidsw]

possibly a disconnected or damaged wire under the seat . Check the connectors and where the wires go into the base of the seat.

 

[Bizonscunny]

possibly a disconnected or damaged wire under the seat . Check the connectors and where the wires go into the base of the seat.

I tried those already. Now I'm trying to find some circuit diagrams for SRS, and when weather get better I'll try to check all related wiring.

 

[whitenemesis]

Even once fixed it will need STAR to clear/reset the light

 

[Bizonscunny]

Even once fixed it will need STAR to clear/reset the light

I got Autel MaxiDiag MD802 to do this.

 

[mersum1es]

What was the codes reader? Do you have a child seat? This is odd because it seems to detect one AKSE child seat transponder (MB child seat has two of them)... It could be system malfunction and it is getting/giving false data, usually when seat pad sensor (or wires) goes bad, fault code points to occupancy sensor directly. Have you owned car long time? Just thinking that if previous owner has used separate transponders with universal child seat and then forgot one transponder somewhere under the seat?

Edit: ok, code reader answered minute ago Autel might do the job, if lucky

 

[Bizonscunny]

Codes were scanned by Maxidiag Elite MD802. I'm not using child seat at all and I guess that previous owner wasn't using it as well as there is no marks or wear on seat at all. BTW own this car for 3 years already. But as you can see on error data above the seat sensor fail was stored quite long time ago, and actual live problem exist in "defective control unit N2/7" (at least that from ECU point of view).