Date registered: Sep 2006
Vehicle: 2004 CLK 240 Coupe
Location: Norfolk. UK
Mentioned: 11 Post(s)
Quoted: 375 Post(s)
I'm no expert, but reading my WIS suggests that there are 2 separate safety systems operating in the SRS, depending on the rate of deceleration.
a) pre-tensioning of seatbelts - with 1 ignition squib (3 stages of operation)
b) operation of airbags - with 2 ignition squibs for driver & front passenger front airbags (for the 2 stages of operation). 1 ignition squib for front/passenger side, and rear passenger side airbags.
i.e, a) will operate on severe braking (only on the seatbelts latched), and a) + b) will operate on severe impact.
Who replaced the airbags? You, your Indy, or MB dealership? If MB, any fault codes should have been successfully reset with STAR diagnosis system.
It looks like the SRS system is managed by the Restraint Systems Control unit (N2/7) that is located beneath the ashtray. I think that this contains the 'deceleration' sensor. This is the unit which triggers the 4 Emergency (compact) Tensioning Retractor units (ETRs) located behind panelling on the B pillars, and behind the rear side panels, - one for each seatbelt.
Each ETR has 3 ignition stages, which are triggered from N2/7 according to the severity of the impact. If the 3rd stage of ignition has been reached, a red pin pops out of the ETR to indicate this condition when examined. Even if all stages did not ignite, the WIS advises renewal of the ETR following a severe accident.
Your existing fault codes could be either ETR squibs that need changing, or wiring that was damaged in the accident. There seems to be no 'common' element here. I assume that your SRS warning light is on?