Wuz

Hi all. Need some help with the benz. I keep getting a front left srs malfunction. Codes come back as 9C3A Driver retractor pretensioner has high resistance. The other code is 9b53 will update on the code description once I scan it again

Plutoe

Clear the faults----fill the seats---pull on the belt in and out----turn the car off and read the module---do you still have faults

Wuz

the light instantly comes back as soon as you clear it

ItalianJoe1

Probably gonna have to replace the defective part...

Plutoe

Makes sense replace the tensioner!

MB+

Hi there, what device did you use to determine what the codes were? I used a Kobra: and it shows no codes.
However, on my 2010 GL450 148k/mileage (no warranty) it shows
1- SRS Front right malfunction
2. Auxiliary battery malfunction (which came on 4 days later)

I'm thinking about removing both the main and aux battery to see if the signs are removed prior to me taking it to the dealer & spending money.
I tried wiggling all 7 seat belts inserts and dusting with moderate compressed air-- no luck.

cetialpha5

You can get those seat belts rebuilt. There's a vendor on here Safety Restore that will do it. I think when I called them up about a seat belt that that wouldn't extend, they said it was $65 to rebuild them. OEM was like $800 and online was about $60-$100 for used ones on eBay. I managed to take all trim off to get at the seat belt mechanism and was able to blow it off and it started working again so I haven't actually had to use them. When I used a scanner on mine, no codes came up because it was a mechanical problem.