#1 #2 or #3 relay

Lisa Gamboa

Asked by Jul 31, 2015 at 08:19 PM about the 2002 Chevrolet Impala Base

Question type: Maintenance & Repair

After research I have came to the
conclusion that the check engine is giving
off code po480. Which also reads fan#1.
But reading into it I have also seen that
pretty much all three relays link in some
way or another. I also would like to test the
pigtails attached to the fans themselves. I
need to know what tool I would need to
check these parts to pinpoint exact

2 Answers


The fan relays are located in the underhood fuse box and labeled on the underside of the fuse box cover. The two fan relays with 4 prongs control each fan individually and the relay with 5 prongs energizes both fans together (high speed). Basically this trouble code is telling us there's a problem with the circuit for fan #1. To get the fan to come on start the engine then select A/C and recirculate on the climate control panel. One of the electric cooling fans should start. If not shut off the engine and unplug the fan pigtail at the fan motor. Please be careful when doing this testing as you're very close to the hot exhaust manifold and the potentially dangerous spinning fan blade which can take off a finger!! Start the engine and using a 12 volt DC test light see if you have power at one of the fan motor pigtails. If so, replace the fan motor. If not remove the relay and see if you have power there. If so replace the relay, they're cheap. If you still have no power at the fan motor but power at the new relay it's going to be a wiring problem. HTH. -Jim

Lisa Gamboa


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