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Old 12-11-2010, 06:04 PM
Registered User
Join Date: Jun 2008
Posts: 1
OBD2 not communicating

On a 2003 W203 C200 Kompressor the check engine light came on.

I connnected an IBM T30 with Xentry and tried to use a Memoscan multiplexer (bought used) but I could not get it to communicate.

The multiplexer kight up both lights - but neither flashed - which i understand inidcates data.

The Xentry started and began opening the communication layer but failed when it could not find the connection - it said it could not find 12v on circuits 30 or 31??

I guessed this may be a fuse problem but the only fuse referenced also services the dipped headlights - which works.

So 2 questions,

1) are there any other fuses I need to check
2) is there any other port (dedicated to the engine?)

Any help greatly appreciated


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Old 12-17-2010, 08:48 PM
126 Guy
Join Date: Sep 2005
Location: Queens, NY
Posts: 523
there might be other fuses associated with the DLC and OBD system. If you have checked those and all associated fuses then suggest pull up a wiring diagram of the DLC and OBD system. If you have proper power and grounds then the device you are using could be defective or just simply not compatible with your vehicle
2001 E55

2001 E320 Sedan

2001 Subaru Legacy

2006 SLK280

2016 Subaru Outback 3.6
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Old 12-18-2010, 11:34 AM
david s poole
Join Date: Mar 2005
Location: dallas
Posts: 1,822
look very carefully at the fuse list.i ran into this about 2 mths ago and had to replace a fuse before communicating with obd2.

David S Poole
European Performance
Dallas, TX

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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