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Discussion Starter #1
the light indicator for the rear window defroster is faint at best at room temperature. It only works when the car is very cold which leads me to believe there is a conductivity issue somewhere. Does anyone know for the plug feeding the CCU which position would power this indicator. I want to explore whether I can improve the conductivity.

Any help would be appreciated
 

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Hello Diggs: Not sure what you mean. It's very hard to see that the rear defroster is on because the light doesn't come on in the display (at least not visible) unless coming from a very cold start.
 

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rear defrost and side mirrors are on at same time. if it is warm out you can melt the mirror. so car knows and says nope. why is light faint? i dunno. maybe its light bleed from another bulb.
 

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You can change rear defroster to manual via ACC. Owner's manual will help you.
ACC keeps side mirrors about +20C regardless rear defroster button.
Faint light is illumination.
 

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Thanks to Mimmi. Using actual temperatures helps. For example, my rear defrost come on when it's still warm out. That's like 35 to 40F. When you think "really cold" is -10F, then 40 seems nice.
 

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Discussion Starter #8
The rear defroster and side mirrors are working. the light indication not so much. I think that's a conductivity issue (i hope). Anyone know what part of the connector to the CCU feeds this light indicator (if there is a separate feed)? My saab specialist put another unit in it to show that the problem is not upstream as the light indicator on the test unit fully illuminated.
 
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