The 4Matic light comes on indicating the 4wd isn't working. I've been resetting it by disconneting the battery. After doing this the 4Matic works for about a week.

Last week it started working again on its own (light went out). The light came on again yesterday. The first time I started it after the failure the 4Matic light blinked 9-10 times. Hasn't blinked like that since. What does it mean?

The system has a computer that should store codes, try reading those codes with a "blink" type tester OR have then read..

Several members here sell those testers OR supply info on making them.

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Thanks for the reply. Can these be read with an oscillascope? If so, I just need to know the connector, pin number and code definitions. Anyone know where these can be found?