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Discussion Starter #1
I have a 2014 Pilot Lx. The battery recently died so I took it out to get it replaced. 36 hours later I purchased a new battery and did the install myself. First connected positive and then negative. Everything was great... so I thought.

I noticed my rear tailgate is not unlocking and I cannot open it when I push the button from the outside. The rear window unlocks and opens fine but not the rear tailgate. All other doors also lock and unlock with remote or inside lock button.

On top of that, when I put the car in reverse my back up camera is not coming on. The screen remains off and displays either the radio functions or stays black if I have the power off.
Everything was working perfectly prior to me changing the battery. Did I short something out or is there a reset I need to do. Again everything was working normal and no signs of malfunctions with back up camera prior to me changing battery.

Any help would be greatly appreciated.
 

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I'm guessing you blew the fuse for that circuit.

Sent from my SM-N950U using Tapatalk
 

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Check fuse 29 (20A) in under-dash box.
Under-dash fuse box: there are 3 large covered connectors. On top connector, squeeze the cover a bit, push right and remove. Raise lever on the left and disconnect.
Pin 20, Top row, looking from wire side, third wire from the right (brown) is tailgate actuator. Apply 12V from battery to it and have someone listen for the tailgate opener activating. If it is not, something is wrong with wires going to tailgate - or something wrong with actuator.

Same connector, top row, pin 13 (from left, orange), measure voltage to ground. Should be 5V. If someone presses the unlock button on tailgate handle, it should drop to 0.2V

Do all lights work properly? I.e. do back up lights come on when car is put in reverse?

In general, after battery gone that long, some things might need to be relearned in car computer, which potentially means a dealer visit...
 

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Chris --

Check the applicable fuses, then the next step is getting a good diagnostic read on the CAN-bus communications. A few consumer plug-in tools can read the CAN-bus error codes. Only HDS (Honda's Diagnostic System) can simulate or diagnose the specific inputs and reset the modules. You can do a rest by disconnecting the battery ground again, let it sit for a few minutes, then reconnect. Your radio & entertainment stack may need a code, but you may be able to get away with just the code-learn procedure listed in your owners manual. That may be enough.
 

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Discussion Starter #5
So I have tried everything from checking all fuses to the door locks, accessories, etc. which were good. I disconnected the new battery and after a few minutes reconnected it again. Still nothing.

The Pilot still has a full warranty from electrical to engine. I have dropped it off and they are running diagnostics.

After several hours, they called me and said they still couldn't figure it out. They were not receiving any error codes on their test but They knew something was off. They said it is possible it has something to do with the multi plex (assuming the motherboard that controls everything). They are still checking but once they figure it out, I will post. They did say that it was weird that everything was working fine one minute and then the next minute the locking mechanism and rear camera stopped.
 

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Considering both failed items are in the tailgate, and are 100% completely electrically not related (camera actually goes direct into the display unit), I would be looking at the conduit where wires go from body to tailgate...
 
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