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First be sure to check all fuses.
If OK, then a common cause is actually the hazard switch. This is also the turn signal flasher. Try ressing in very lightly on the hazard button and see if the turn signals start to work. Of press button on and off very quickly and harchly several times, then try the turn signals.
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The most likely cause is the turn signal flasher.
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Would you show me the 2003 Chevy impala owners manual?
Check with your local Chevy dealer on that.
Is there a fuse that goes to the rear defroster of a 2003 Chevy impala?
Yes
