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Battery Drain

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Stupots:
My car is drawing over 1A when my car is asleep and flattening the battery in a few days (all of a sudden, not changed anything on the car in a while). I'll start trouble shooting today. I've made reference documents of both fuse boxes and picked up a clamp meter, so I can monitor total draw whilst I'm checking potential difference across each fuse; I won't be pulling fuses initially (with bonnet and door latch tricked). I've retrofitted so many parts, it may be that I have to put up with a bit of above normal draw, but I'd love to get it closer to the 50mA target!

I'm hoping it's a door module or tailgate loom and not CAN Gateway (AN hardware, BQ software) or Head Unit (Discover Media).

Wish me luck (and any tips welcome)

Stu

pudding:
I bet it's the Chinese head unit.

mjmallia:
I had a current draw from the rain sensor when the car was locked, as when I was not driving during the lockdown the battery was not lasting very long.

There was a setting in VCDS that allowed the rain sensor to check for rain all the time to close the windows if it rained.

Switched that setting off and all was fine again.......could be a possible one to check also

Stupots:
@Pudding It's a VW Discover Media and not been a problem in the 2 years I've had it, but never say never.

@mjmallia Good shout! I have noticed it shutting the sunroof in the past when I've left it open and it's rained, so that's def one to check and change!

pudding:
Sorry, my reply was sarcasm  :grin:

Having said that, I've had 2 x RNS510s that caused battery drain.  An old revision A and then later a Revision P.  The P at least could be fixed with a firmware update.

I suppose you could pull the harness out of the radio and see how long the battery lasts then?  A bit of a faff I know.

I never knew that about the rain sensor in the 8 years I owned mine. Clever old cars the MK5.

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