Hi Scotty I have a 2015 Honda Pilot se with 80000 mile. My battery keeps draining. After two to three days the pilot won’t start. I’ve replaced the battery twice and the replaced ac relay. I’ve also taken it to the Honda dealership twice and they have found nothing wrong.
You have a parasitic draw which drains your battery. You have to use a Multi meter and hook it up between the negative cable on the car to the ground on your car. The multimeter should be set on AMPS. Check the reading on the meter. It will show the amount of amps being used...open the door and if the inside light works...the meter should increase...showing the draw. The diagnostic procedure is to remove one at a time each fuse and note how it affects the meter reading. Do it one fuse at a time. note the amount of amps affects when fuse is pulled. Remember to put the fuse back in...its one fuse at a time test. Pull another...if that makes the meter go LOW...you have found one circuit which is a draw. Note that circuit and location. Keep going...till you pulled them all one by one. If no other fuses seem to affect the meter then go back to the one that did and research what circuits or circuits it powers. Remember that your car could have multiple fuses boxs but you need to check them all to be through.
This is the right answer. A PITA, but the right answer.
I would think the dealership did this they had it for three days
They didn't do jack. Just kept the car for three days just sitting there and charged you. Everyone knows how stealerships operate.
A GOOD clamp on ammeter will work too and be even easier ; )
I didn’t get charged
are you original owner or you bought it used?
If it's a flood vehicle, there is a short in the wiring internally.
That would make it very difficult for any dealership to find the problem.
If you bought this used, and no one knows its a flood vehicle, and if it continues the problem, SELL The vehicle, or have the dealership replace all the wires, you must ask for the old wires back, to make sure they replace all wires.
This should fix the problem.
I’m the original owner
I have a hypothesis I'd like to run up the flagpole and see if anybody salutes.
You say you've replaced the A/C relay. But that doesn't necessarily mean you've eliminated that problem from suspicion.
That relay has 4 pins.
1 is 12 volts in
1 is positive voltage to the relay's coil
1 is 12 volts out (to the A/C compressor)
1 is ground.
So what if the relay socket is set up in such a way where the positive voltage to the relay's coil is "always on" and the relay's coil is energized by a "trigger ground".
What if the ground wasn't being turned off by whichever module was controlling it?
In this case you'd be energizing the relay's coil while your engine is off and causing a battery drain.
Easy way to test my hypothesis is the next time you park the car for the night, pop your A/C relay out.
Does locking my car put it sleep mode
You have a drain somewhere. Some of these with auto tailgates and have parasitic draw, that is one example only. Have to check everything. And no, dealership won't do that.
Body control module failure. There are companies that will repair...far cheaper than new.
