Rear window defroster not working after hitting lower dash

GLENH

MEMBER
2005 CHEVROLET IMPALA
3.4L
6 CYL
2WD
AUTOMATIC
180,000 MILES

Defroster worked fine, started having a problem with the blower motor not working, but if you slapped the lower dash between the defroster switch and the glove box, the blower motor would work. It now works fine, but now the rear defroster does not. When turned on, the light works, you hear the relay click. Replaced it with new anyway. There is no power to the rear defroster. Tabs and grid on it are fine. Everything else in the car work perfect, AC/cruise, all fuses that I can see look fine. Worked fine until I hit the lower dash. What could I have done to make it stop working by hitting the lower dash?

6 Replies

JDL

MECHANIC
16,098 POSTS

Note the diagram, the load side of relay is fuse protected. The load side of relay is that line with arrowhead. Did you check the fuse? Not only check the fuse, check the fuse circuit for voltage, use a test light. Check the circuit breaker for voltage. I did not everything in one picture. See the wire from antenna module that is voltage for rear grid, why they run it through that module? The two wire connector for grid, is voltage and ground, need both. My email does not work and I got frustrated trying to fool with it, so if you have a reply, I will not get it.

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Thursday, September 14th, 2017 AT 11:42 AM

GLENH

MEMBER
3 POSTS

I have checked the following and they work fine. AC/cruise fuse, the heated mirror fuse, guessing the circuit breaker is working as the relay clicks as it should. Do not know where the circuit is for the radio. Ant or the colors of those wires. Where else to look?

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Thursday, September 14th, 2017 AT 12:10 PM

GLENH

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Also, while in the passenger side fuse panel, I see the everything that is to be there, but no circuit breaker. I have taken off the nut and pulled apart the wire connector block where the diagram says there is a breaker, and still no breaker as your diagram shows. So where is this circuit breaker really? Relay and fuses are in block where they should be.

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Thursday, September 14th, 2017 AT 12:21 PM

JDL

MECHANIC
16,098 POSTS

Sorry, all I can do is post what the database shows. The database is not always correct. You looked on the back side of fuse block?
If you wire voltage off the load side of relay to grid, what do you think will happen, just for testing? With a 30 amp fuse.
Evidently, I do not have location of circuit breaker?

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