weird electrical problem with Nissan Patrol GQ 4.2l Diesel

i had this problem just last week it turned out to be a faulty relay under the dash on the left of the glovebox close to the firewall where you have circled but on the inside , the relay was for electric door locks which would buzz and make a noise like you describe there are 2 or 3 relays tucked in there and it kind of makes the noise travel and sound louder than it really is !

Try putting your fingers on relays as they click and you should 'feel' which one. That pressure switch will not be doing anything unless the air con has no gas. It can be shorted across to test air con. Maybe the air con fellas crossed wires somewhere.

Bro if ya have dodgy wiring, power could be find it's way to ground and causing relays to switch as the heard fault.
Get dodgy wiring fixed up firstly, and problem may simply be fixed as a result.
And no, for all power being off with the key off.
There are plenty of circuits still with power with ign key completely off.

Thats one reason while working on car to disconnect battery as good safety practice.
Or for that matter anything with power.
Electronics need to be drained of power.
As power can be stored in capacitors, even in car electronics.

just a thought if you have the time.
with a little research books available on basics or even advanced on car electrics.
not preaching, a little study may get you out of strife some day.
may even do this myself.

Cheers

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Originally Posted by cookpa

i had this problem just last week it turned out to be a faulty relay under the dash on the left of the glovebox close to the firewall where you have circled but on the inside

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Thanks for your input, but it can't really be on the inside of where I circled as the circled area is right behind the bullbar, facing forward. Just in front of the main battery.
At the moment, the relays stay put and don't cause me any grief. Finding it hard to look for a fault when it doesn't seem faulty. but rather moody. :(

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Originally Posted by jedskipow

Maybe the air con fellas crossed wires somewhere.

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Thanks for your reply.
That's exactly my theory!! Especially since the hole drama only started after they worked on it. Car wouldn't start as nicely as before, battery seemed tired/drained and last but not least I hear the relays clicking like it's a competition!