M-Class (W166) Produced 2012-2015

Pre-Safe warning, seat belt

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Old Jun 29, 2025 | 08:45 PM
  #1  
psh2018's Avatar
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From: Potomac MD
2015 ML350
Pre-Safe warning, seat belt

Hello again,

2015 ML350
Bought in 2018 with 15K
Currently at 90K

(thanks for recent help on the noisy door hinges)

Another issue that I would appreciate some input on. A dash waning has been coming on for longer than I want to admit -

"PRE-SAFE Inoperative See Operator's Manual"

Shop said passenger seat belt assembly needs replacement, and I can say that the belt doesn't snug up the same way the driver's belt does. MB new part is $1161 . . . . ouch. Has anyone had this issue before, and if so, was replacement the only option? There are several companies that rebuild / repair them including:
safetyrestore.com

myairbags.com
Price is $80-150 depending on which seatbelt, and their websites are impressive. Anybody use them?
The implication seems to be that accidents cause these issues. I bought this car at 3 years and 15K miles, and otherwise there is no indication of an accident, so don't know why this would be happening.

Thanks for any thoughts or suggestions.


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Old Jun 29, 2025 | 09:57 PM
  #2  
CaliBenzDriver's Avatar
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W212 MY'14 M276-3.5NA @75kMi
Summer is a good time for maintenance.. source a "slightly used" unit from the junkyard: $100.
Test repairs using scanner or Xentry for self test result.
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Old Jun 30, 2025 | 04:45 AM
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Mattml430's Avatar
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From: Australia
2014 ML63, 2018 GLC43, 1929 DB victory six sports roadster
Before you replace the belt how are your batteries. The battery may start the car effortlessly but if it’s not in great shape you can get all sorts of weird **** happening. My battery was 7 years old in my 500 and I would get all sorts of messages coming up on the dash.
Scan the modules and see what comes up.
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