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#1
11-18-2002, 09:17 PM
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SRS Crash Sensor
I just got a used SRS Crash Sensor for my 1987 300D, since the SRS light is on all the time. I assume just unplugging the old and plugging in the new (with the battery disconnected) should be all I need to do. Is this true?
Also, the cord is about 3.5 ft long. Where does the red 10 pin plug go? 1987 300D 176,000 mi 2001 CLK 430 18,000 mi 
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#2
11-22-2002, 10:01 PM
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Was the car in an accident? If so you might need to replace the ETR's as well (the seat belt tensioners in the "B" pillar).
The sensor mounts to the tranny hump, about under the stereo, or at least it should be in a similar area on a 124. The grey cord runs along the passenger side of the hump and connects under the passenger side false floor in the foot well. It' s the only red connector there. Be careful working that red 10 pin plug off, they will break if not careful - apparently not as tough as the black ones.
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Mike Tangas '73 280SEL 4.5 (9/72)- RIP  Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum.
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#3
11-22-2002, 10:29 PM
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are you sure your sensor needs replacing?at start-up my srs light will come on as well though it will go out in a couple of minutes.through other posts i've been able to narrow it down to the contacts behind the steering wheel or a faulty seatbelt receiver(at least i hope that's where the problem lies!)
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'95 s500 (bought for wife but can't bear to share!!!) 125kms '92 legend 180kms '88 tbirdturbo(fantastic car-only regular maint.)120kms '87 mustang gt(gone) '86 tbirdturbo(gone) '85 mustang gt(gone-but not forgotten)
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#4
11-23-2002, 01:11 AM
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One other thing that will trigger the SRS light, low voltage - less than 10.1Vdc.
__________________
Mike Tangas '73 280SEL 4.5 (9/72)- RIP Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum.
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#5
11-23-2002, 01:51 PM
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I bought the car used from a dealer so I am not sure if the car was in an accident. However, when I picked up the car, the SRS light was not originally on. After about 1000 niles later, it started to flicker on and off. Now it is on all the time.
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#6
11-23-2002, 03:55 PM
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 mike,what would trigger low voltage?would worn contacts affect this reading?which contacts?and last but not least:would this need to be erased from the diagnostic computer?
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'95 s500 (bought for wife but can't bear to share!!!) 125kms '92 legend 180kms '88 tbirdturbo(fantastic car-only regular maint.)120kms '87 mustang gt(gone) '86 tbirdturbo(gone) '85 mustang gt(gone-but not forgotten)
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#7
11-23-2002, 10:36 PM
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On the older air bag systems there is nothing to reset or code to erase. On the newer model I believe there is. Worn brushes (regulator) or a bad alternator could cause the low voltage.
djankov, one other test to try. When the light is on, try honking the horn. Sometimes when the slip rings are worn the act of horn honking causes the spring loaded contacts to connect with the slip rings. I believe any time any portion of the SRS system is out of the loop the light will trigger.
__________________
Mike Tangas '73 280SEL 4.5 (9/72)- RIP Only 8,173 units built from 5/71 thru 11/72 '02 CLK320 Cabriolet - wifey's mid-life crisis 2012 VW Jetta Sportwagon TDI...at least its a diesel Non illegitemae carborundum.
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