I have a 93 E320 Wagon and have never been able to pull codes off it.

The push button on the reader in the car is non functional. I noticed that all the wires under it have had a minor amount of insulation cut away as if the PO's were troubleshooting this at one time.

I cannot find any wiring diagrams of this unit and am looking for any suggestions on how to start.

I have already built a reader (A Dalton design) and cannot get that to function as well.

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Brian G.

1994 E320 Wagon with many warts SOLD
1995 E320 Wagon with a beauty mark or two FOR SALE