My SRS light has come on and I went to hook up my OBD II scanner and there is no port underneath the steering wheel are.

Is there another spot to hook these up or is it because these werent standard until 1996?

Not standard in the 124.

Check battery voltage when the light comes on. It might be a sign the voltage regulator is tired.

Sixto
87 300D


Sixto
87 300D

As sixto said.

There is a diagnostic module on them though. Do a search on diagnostics on this chassis. Pretty simple/straight forward.

__________________
Jim

As a note, even if it were a 96 and OBD-2 compliant it wouldn't give you airbag faults.

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

the srs light has to be reset through the dealer or by an indy who has the setup. cant be reset through odbII

__________________
1993 e300
1995 e320
1994 e320
2006 s500 4matic
2004 Jeep wj overland
2001 Ducati 748
2004 Honda shadow aero

there is no 16 pin obd port under the dash - everything can be scanned by a flash tester from the 16 pin diagnosis port beside the battery. dont remember the SRS pin, but 4 is Diesel Idle control system, 7 is HVAC, 1 is ground, 16 is switched positive.

A very usual case for SRS light problem is low voltage.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Here is a pic of diagnostic connector layout. I've never had the need to use it, but I am wondering how to go about building a flash tester . . . or where to get one if they're cheap. Anyone done this?

Attached Thumbnails

 

__________________
'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman

As was mentioned.....ODB II didn't take effect until the 1996 model year across manufacturers. Prior to that they were ODB I for a number of years....and that was manufacturer specific. ODB II was a standardized interface

__________________
Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
---------------------
Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

The tester can be built for less than 10 dollars at radio shack - you need three banana plugs, a 12V LED a momentary switch button and something for everything to be held up with (e.g. old camera roll case)

the diagram for making it is available on this site too, search for it as LED code reader.

You can also use a small 12V light bulb.

__________________
2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

...

For emissions related faults in the engine and sometimes transmission. It often won't give you accurate information about body module faults, moreso on a German car.

-J

__________________
1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

This is generally, but not EXACTLY correct. OBDII was required on all US delivered vehicles in the '96 model year. There were some particular models from several makers in the '95 and even (I think) the '94 model years. The W201 or W202, whichever was from these model years, MB's were among them.

Additionally regarding OBDII, there is a specific list of standard OBDII codes that are required to be available from all manufacturers. This covers only a fraction of codes from various manufacturers. Things like airbag systems, antilock brake systems, electronic transmissions, etc. are NOT part of the standard OBDII code set, thus, manufacturer specific test equipment, or special aftermarket professional test equipment is typically required to pull these codes.

Larry

good to see you back Larry.

__________________
Ben
1987 190d 2.5Turbo

X2



Also, this may be helpful:

http://www.peachparts.com/Wikka/EngineControls

and this one for using an LED to read the codes:

http://www.benzworld.org/forums/r129-sl-class/1266535-diagnostics-sl-pre-94-a.html

__________________
'95 E300D ("Tank") - 231,000 miles
'79 240D ("Biscuit") - 197,250 miles (Sold)
'83 240D ("Ding-Ding") - 217,000 miles (Death by deer)
______________________________________

"Back off, man. I’m a scientist” ~ Peter Venkman

If you add Arthur Dalton's name to the search query you'll find RS parts #'s and instructrons on how to build it and use too.

Larry, you have so much to offer the diesel forum, its good to see your name again.

__________________
Terry Allison
N. Calif. & Boca Chica, Panama

09' E320 Bluetec 77k (USA)
09' Hyundai Santa Fe Diesel 48k (S.A.)

JimF's site has good diagnostic info although focused on the 140.

http://www.k6jrf.com/MB_S500.html

Sixto
87 300D