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Old 03-02-2011, 06:50 PM
Yak Yak is offline
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Join Date: Aug 2009
Location: San Antonio, TX
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Quote:
Originally Posted by turbobenz View Post
How is this even possible? Were working on a 300cd and non of the windows work at all. We swapped in good known good switches, nothing. I directly power the window motors and they work great. The fuse is fine and I replaced it with a new one and checked continuity. Im not getting any power to the switch sockets though. My question: Is there a relay? Google searches are of no avail neither is alldata.
It's helpful when you say "the fuse" if you specify which one. There are three associated with the power windows. Do you mean fuses "a" and "b" that control front right\rear left and front left\rear right, respectively? I presume no, since you say "fuse" singular.

So you probably mean fuse 12. This provides power to the relay.

Yes, there's a relay. If Funola knows it's on the wheel well, I'll defer to his experience; but the electrical service manual says it's behind the cluster.

One more question: what's the key position when you're testing? The relay only closes in Run (position II) or start. ACC (position I) doesn't close the relay, so no power to the switches.

To isolate the door wiring, try applying power across pins 3 and 4 on the front switches; or pins 1 and 2 on the rear. Of course there are no rear doors on a CD, so the "mangled accordion" won't be a factor there.
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