Question about Cars & Trucks
Switch light comes on demister not working. Please help!
Posted by Anonymous on
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Posted on Jan 02, 2017
Check rear demister control relay operation,
Check for presence of 12V power (and ground connection) at rear window heater connection.
Check continuity of the rear window heating element.
Posted on Aug 17, 2009
Best guess and best solution - have it diagnosed by a qualified technician. This way you'll find out exactly what's wrong and what's required to fix it (parts, labor, etc.). You may have to pay the diag fee, but you'll also find out what's causing the problem and maybe decide to fix it yourself.
Posted on Sep 07, 2009
If the light was flashing when it came on, then it means your engine is misfiring.
A solid light can mean anything from a loose/faulty gas cap to a transmission issue.
This light comes on when the computer detects a fault of some sort in its diagnostic tests. If it keeps detecting this issue, the light will remain on. If the light turns off, then it has detected that the issue may no longer be present.
In order to find out what the exact reason was for your light, You need to have your car computer scanned to retrieve the code that the computer would have stored when the light triggered. Most garages will do this free of charge. The code will tell you what may have caused the light to initially turn on.
Posted on Nov 11, 2009
Using a test light, connect clip to one of the leads of the grid and probe the other. If it lights, the grid is open. If it doesn't, there is a power or ground open going to the grid. If it doesn't, clip to a good ground and check each wire at the grid. If the light lights, the ground circuit is open. If it doesn't, the power circuit is open. If power is open, check appropriate fuses, etc.
Posted on Jan 19, 2010
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