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Old 12-21-2008, 06:48 AM
I love German Cars
Join Date: May 2008
Location: USR, NJ
Posts: 103
W124 94 E320 - Rear defroster not functioning

Hey guys. I need some help.

For some reason my rear defroster will not stay on. I can push the button, and the yellow LED turns on, but only stays on if I hold it. In no other fashion will it stay on unless I hold the switch in the on position.

It worked a while ago...when I mean a while ago I mean last winter...but stopped working since then.

Anyone have any advice on this?

Thanks guys,

1975 W116 280S - SOLD
1994 W124 E320 Coupe - Gone

CURRENT - 1974 450SEL
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Old 12-21-2008, 07:48 PM
babymog's Avatar
Loose Cannon - No Balls
Join Date: Jan 2006
Location: Northeast Indiana
Posts: 10,767
Convenience module.

Behind the fusebox, there is a lid held by four screws. Remove that and the long relay-looking module in the center is the "convenience module". This controls the latching function and timing of your rear defogger (among other things), you're experiencing a common failure mode of this module.


Gone to the dark side

- Jeff
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