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Old 06-10-2001, 09:57 PM
Registered User
Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
Car operates fine, though there are known issues with the passenger seat belt being jammed, a bad expansion valve in the A/C, and a few other things. Anyhow, I checked for diagnostic codes and found a bunch.

At a minimum, I am hoping that someone can explain which systems correspond to which pins on the diagnostic connector. I know that #3 is the CIS-E and #6 is the SRS, but have no clue what the others are. Further, if someone has a spreadsheet or text document with the interpretation of these codes I would much appreciate that too.

Finally, was thinking about a simple circuit that could drive a pair of L.E.D. displays to count the diagnostic pulses automatically. Would cost about $7 in electronic components and another $3 for a nice little enclosure. Would be simple to make. Anybody interested? Probably not worth the trouble, but hey?

Bob Terry
1964 220SE coupe
1969 280SL auto
1969 280SL manual
1990 300SL manual
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Old 06-11-2001, 05:57 PM
Join Date: Apr 1999
Location: Carrollton, TX USA
Posts: 45
90 SL problems: seatbelts, ac, rollbar light

I posted messages in the SL forum, and am sorry this is off-post to yours, but any help would be greatly appreciated... my seatbelts are jammed, my ac quit blowing cold (after sitting in the sun for 3 days; it previously blew freezing cold)and the roolbar warning light stays on. I knew how to read diag. codes on my mustangf, but haven't a clue when it comes to the mercedes. Is there an easy way to access the codes? Thanks in advance...
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Old 06-11-2001, 06:27 PM
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Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
The codes are retrieved by connecting an L.E.D. in series with a resistor between the pin you wish to check and chassis ground. This resistor can be any value from about 470 ohms to 2K ohms -- you probably don't need the resistor, but it's good to have it.

Once connected, the L.E.D. should be ON. Now, short the pin to check to ground for 2 to 3 seconds. While shorted, the L.E.D. goes OFF. When the short is removed, the L.E.D. will turn ON again. After a couple of seconds, it will begin issuing whatever diagnostic codes are present. Each time the L.E.D. goes off is a pulse. When the pulsing finishes, you are ready to retrieve the next code by once again shorting to ground for 2 to 3 seconds.

When the system has issued the last code and another is retrieved, the system repeats the codes in the same order as before. This is how you know that you have them all.

You can erase a code by shorting the pin to ground for 6 to 8 seconds after just after it has been read.

Talked to an engineering genius friend of mine. Says he could write a computer application that would automatically retrieve codes and could be configured to automatically erase them as well. Pretty slick. Would interface to the diagnostic connector through the PC's parallel port.
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Old 06-11-2001, 09:40 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,768
The later model buil-in diagnostic led/sw pulse
circuit uses a switched ground and B+ to feed the
That way , you are counting the flashes vs the spaces.
Also better in the sense that you know you have the circuit with the push of the switch.

Bob Terry,
Yes, I would be interested in seeing your auto circuit.
If you email me , I will send you the connector pin-outs.

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Old 06-13-2001, 04:32 PM
MBenzNL's Avatar
Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
...aufs German:

1 Masse Aggregateraum (W16)
2 Tastschalter (USA Kalifornien)
3 Steuergerät KE (N3)
4 Leuchtdiode (USA Kalifornien)
5 Steurgerät ASD (30/2)
6 Steurgerät Gurtstraffer (GUS) mit Airbag (AB)
7 Steuergerät Überrollbügel (URB N53)
8 Steuergerät EZL/AKR (N1/3)
9 Steuergerät Adaptives Dämpfungs System (ADS) Federung (N51)
10 Steuergerät Verdeckbetätigung (N52)
11 Steuergerät EDW (N26)
12 Steuergerät Infrarotfernbedienung IFZ (N54)
13 Steuergerät Automatische Getriebe 5-Gang (N15/1)
14 Motoraggregate-Steuergerät MAS (N16)
15 Reifendruck
16 Sicherungs und Relaiskasten (F1) Sicherung 6, Klemme 15 (F1-6)

In English it would sound a bit like:
1 ground (W16--connected near the computers under the hood)
2 a certain switch (USA California)
3 some kind of module KE (N3)
4 LED (USA California)
5 module for ASD anti-sper-differential (30/2)
6 module for seat belts (GUS) and airbag (AB)
7 module for roll bar (URB N53)
8 module for EZL/AKR (N1/3)..don't know, something with ignition distributor
9 module for auto leveling shocks (ADS)(N51)
10 module for the softtop (N52)
11 module for EDW (N26)...have no idea
12 module for remote locking system (N54)
13 module for auto 5-speed transmission box (N15/1)
14 module for motor related parts MAS (N16)
15 tire pressure
16 fuse & relays box (F1) fuse 6, clamp 15 (F1-6)


1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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Old 06-13-2001, 06:33 PM
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Join Date: May 2001
Location: Las Vegas, Atlanta
Posts: 669
According to info from Arthur Dalton:

11 is the anti-theft alarm system

Last edited by bobterry99; 05-23-2002 at 05:47 AM.
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