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Ask TODD RUZICKA Your Own Question
Category: Chevy
Satisfied Customers: 55
Experience:  Service Consultant at Main Motor Chevrolet
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Rear window defroster no worry, light comes on that's it.

Customer Question

Rear window defroster no worry, light comes on that's it. Swapped out relays NAPA and GMi
JA: How many miles are on the car? Has the car been starting normally?
Customer: 59k no issues starting
JA: What is the model/year of your Chevy?
Customer: 2013 Impala LTZ
JA: Are you fixing your Impala yourself? What have you tried so far?
Customer: Yes, swapped out through relay in the fuse box under the hood
JA: Anything else you want the mechanic to know before I connect you?
Customer: Not really after reading here just now finding out about a 40amp fuse identified as Batt3
Submitted: 11 months ago.
Category: Chevy
Expert:  TODD RUZICKA replied 11 months ago.

Hi and thank you for your question, It looks like you are on the right path. Power comes from the HVAC control module to the under hood fuse box, through the REAR DEFOGGER relay, then through the 40 amp BATT3 fuse, check that fuse. If it's blown, replace it. If the fuse is good, proceed with a volt meter or lighted circuit tester to the connector directly on the back glass. If there is power (12v) or if your test light lights, there is sufficient power to the grid. That would tell you the rear defogger grid is open electronically. If there is no power to the back glass, you'll have to trace the wiring from the back glass forward to the fuse box. I hope this helps.