Test 4: Cockpit Switch Group Circuit 31 Internal Connection
WARNING: This page is about a different car, the 1999 Mercedes-Benz E55, 1998 Mercedes-Benz E430, 1998 Mercedes-Benz E320, and 1998 Mercedes-Benz E300. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition switch to LOCK position. Disconnect cockpit switch group harness connector. Measure resistance between terminal No. 31 at cockpit switch group harness connector and pin No. 4 at cockpit switch group. If resistance is one ohm or less, cockpit switch group circuit 31 internal connection is okay at this time. If resistance is greater than one ohm, replace cockpit switch group.