Trunk fuse keeps blowing

Tiny
BRENDAMW
  • MEMBER
  • 2016 CHEVROLET IMPALA
  • V6
  • 2WD
  • AUTOMATIC
  • 65,000 MILES
The trunk fuse in my car keeps blowing. I have replaced it three times. I recently had the engine and cabin air filters changed and I am not sure if the wiring may have gotten messed up with that somehow. Anyway, to get a wiring diagram?
Monday, October 25th, 2021 AT 10:56 AM

3 Replies

Tiny
AL514
  • MECHANIC
  • 4,692 POSTS
Hello, is this the "Trunk REL Fuse" 5Amp that keeps blowing? I'm assuming you are going to try to open the trunk, it doesn't open, then you notice the fuse. I would like to know if you have a fuse in there and it blows without you trying to open the trunk using the instrument panel switch. That would tell you if it could be a short on the motor circuit for the release latch or is its somewhere before the latch relay. And does this model have 2 batteries. It looks like it does.

Also, some more information on the vehicle, is this a Limited model? 3.6L engine?
And what Sub-model LS, LT, LTZ?
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Monday, October 25th, 2021 AT 11:20 AM
Tiny
BRENDAMW
  • MEMBER
  • 2 POSTS
I don't think this has two batteries or not. It is a 2LT 3.6L. It is #66 in the fuse panel, and it is a 5 amp. I am not sure if it blows without me trying to open the trunk from the fob or interior. How do I check that?
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Monday, October 25th, 2021 AT 12:36 PM
Tiny
AL514
  • MECHANIC
  • 4,692 POSTS
If you have a second battery it will be in the trunk behind the left-hand side (driver side) Trim panel. Not that its important right now, buts it's good to know if you do have one in case of future issues. The wiring diagram is saying it might have one. There's a lot of different changes depending on the different model/sub models.

But anyway. since you don't have a circuit breaker set for 12v automotive use.

You would have to put another 5-amp fuse in and run the car, take it for a ride, make some turns left and right. Come back and without trying any switches or the key FOB, recheck that 5-amp fuse. You can take it out or test it with an automotive 12-volt test light or multimeter. I will leave a guide on using a 12volt test light below. They're very simple to use, you would just hook the test light up the battery negative and touch the test light to each side of the fuse. If both sides light up the fuse is not blown.

If the fuse does blow without you attempting to open the trunk, then it's a short somewhere from the battery to the Trunk unlatch Relay because without activating the relay, that's where the circuit ends. as in the diagram. That would mean that the short is in the engine compartment somewhere because that Relay is in the Under-hood Fuse Block.

If you come back from your test drive and take the fuse out, which will be easiest for you to do, and it's not blown. Put it back in and try to open the trunk with the interior switch. We'll see if that blows the fuse.

Then we will have to track down the problem. You are going to need a multimeter to check the circuits. Short circuits to Ground can be hard to find if you have never tried to find one before. You may want to get a few 5-amp fuses if you plan on trying to find this short circuit yourself.

If you are able, can you take a picture of the fuse box with the cover off and a little bit of the surrounding area? Im only asking just incase I can spot something obvious..

Sorry for the long message, I just want to give you as much direction as possible ahead of time.
Just added a diagram showing the end of the circuit.

One last thing can just check that the carpets are not wet down in front of the front seats, both sides. Just a precaution.

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

https://www.2carpros.com/articles/how-to-check-wiring

https://www.2carpros.com/articles/how-to-check-a-car-fuse
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Monday, October 25th, 2021 AT 1:59 PM

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