2010 230 PME or Keypad issue?

[DAtique]

Any help on diagnosing an issue here please? Attempted to take boat out yesterday for Memorial Day and it nothing works or almost? Boat is a 2010 230 with the ZR409. Ran great last weekend and everything worked as it should.

Turn battery switch on in rear, flip toggle to on, enter code on keypad and the little light comes on.. Hit start button and nothing. Same with blower, ballast and even horn buttons. Any button I press on keypad makes a inconsistent humming/buzzing noise under dash. Pulled the cover off and its the PME box making the noise. None of the breakers were tripped. Batteries have good voltage and voltage reads good at the terminals at PME box. Not sure where the ground from PME box goes to or where to check other end of it? Not sure if this is sign of a bad keypad or bad PME box but I don't think its a bad breaker per say.

[DAtique]

Update.

Checked all grounds on ground bars under dash and everything is tight and no corrosion that I can see. Unplugged and checked the keypad and that appears to be clean also. Keypad will take the code and light up, Linc screen boots up, stereo will come on and bilge from toggle will run. Pressing ballast buttons, does nothing. Pressing the blower or horn button makes the PME box buzz and then keypad quits working and Linc screen goes off.

I haven't checked grounds on engine yet. And haven't opened the pme box yet.

[SilentSeven]

Tricky one. Sounds like all keypad functions are not operable but other non-keypad systems are? Also, sounds like the keypad is functional in some partial sense as it powers up, acks the code and appears to trigger PME functions (the buzzing).

Can you think of anything that might have changed from the time you last ran the boat to now? Did you have anything apart or change anything electrically? Did you connect a battery charger?

I seem to vaguely recall that Nautique Parts had some ability to test keypads? I might try giving them a call and see if indeed this is something they can do or if they have additional insight to the problem.

Do post your progress as I think others will benefit what the final solution turns out to be.