Rear Window
Thread Starter
Racer
Joined: May 2017
Posts: 256
Likes: 12
From: Everett WA
Rear Window
The only electronic glitch with my lovely C5 Supercar is the rear window defroster. The button lights up, but the elements evidently aren't heating at all. Is this a problem common to C5's? Fuse, connector, where's the best place to start?
Safety Car
Joined: Dec 2010
Posts: 3,938
Likes: 498
From: Fords, NJ
If it's not that the next thing I would do is put a multi-meter to the 2 lugs on the grid and see if you have voltage to it with the switch engaged.
If you have no voltage there then you have to investigate further back.
I'm not sure if that circuit is fused separately of combined with another circuit. I'm at work so I can't access my manuals but this should at least start you in the right direction.
OK, I did have SOME info here at work.
You can try looking at the Instrument Panel Fuse Block , which is located in the passenger foot well next to the BCM, Maxifuse #48 which supplies the rear defogger.
Last edited by SG Lou; Jun 21, 2017 at 01:13 PM.
Drifting
Joined: Nov 2016
Posts: 1,660
Likes: 365
From: SF Bay Area
I recently had this issue, and it turned out to be a bad relay. I forgot what relay number it is, but it is the big one at the bottom of the passenger footwell fusebox. I brought it to O'Reilly's and got a replacement one right away.
However, it seems to me that the rear defroster is really weak. I measured 12v at the contacts, and it barely defrosts the rear window.
However, it seems to me that the rear defroster is really weak. I measured 12v at the contacts, and it barely defrosts the rear window.
Last edited by Tsumi; Jun 21, 2017 at 01:14 PM.
Thread Starter
Racer
Joined: May 2017
Posts: 256
Likes: 12
From: Everett WA
I recently had this issue, and it turned out to be a bad relay. I forgot what relay number it is, but it is the big one at the bottom of the passenger footwell fusebox. I brought it to O'Reilly's and got a replacement one right away.
However, it seems to me that the rear defroster is really weak. I measured 12v at the contacts, and it barely defrosts the rear window.
However, it seems to me that the rear defroster is really weak. I measured 12v at the contacts, and it barely defrosts the rear window.
