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Old 01-14-2007, 11:46 AM
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Diagnostic LED mystery (non-responsive after clearing codes) 1992 500E

My New Toy: 1992 500E (124-036)...

The “Diagnostic Module” has stopped responding to code reading efforts.

When I picked up the car & checked for codes, the diagnostic module reported code #6 (idle speed control faulty) and #17 (data exchange fault between individual control module). I then successfully cleared both stored codes.

Now when I query the system, there is no response. The LED will light up when pushing the button, but when the button is released the LED goes out, but there is no read-back of anything – not even the “one blink” / O.K. signal.

I’ve read through the archives for hours, but I can’t find any reference for a situation like this. Any input would be GREATLY appreciated!

Thank you in advance…

Note: this situation exists at both the factory 16 pin connector with the built-in LED, or with the home-made LED tool at port 19 on the 38 pin “X11/4” connector.

Current rolling stock:
2002 E320 83,000 - Recently acquired cream-puff!
1992 500E 217,000+
1995 E300D 412,000+
1998 E300D 155,000+
2001 E320 227,000+
2001 E320 Wagon, 177,000+

Prior MBZ’s:
1952 220 Cab A
1966 300SE
1971 280SE
1973 350SLC (euro)
1980 450SLC
1980 450SLC (#2)
1978 450SLC 5.0
1984 300D ~243,000 & fondly remembered
1993 500E - sorely missed.
1975 VW Scirocco w/ stroked, slightly de-tuned Super-Vee engine - Sold after 30+ years of ownership.
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Old 01-14-2007, 12:55 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
No Led feedback initiation until the car has gone through all Self-Test Emmisions procedures.
Takes a few drive cycles............................

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