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Parasitic battery drain

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mjmallia:
The rain sensor saved me a lot of current draw.  Mine had the rain monitoring option on for windows, so it was always checking to see if it was raining and had access to the module to close the windows even when locked.

OllieVRS:
My fuse giving trouble is the central convenience module fuse, yellow 20amp on the bottom right. Draws 0.1A after all other modules go to sleep, so I assume it's my issue. The car can't be locked or unlocked without the fuse in though, so not one I can take out and forget about.

I'm not sure how to diagnose mine further.

Any luck with yours? I'd be checking all the internal lights are definitely off with the car off, including glovebox and boot. Leave your phone inside recording a video to check.

OllieVRS:
Unplugged all the passenger door connectors as I had a door light fault code, wasn't that, so I unplugged the next thing causing a fault code, alarm siren. Turns out it was that  :grin: now down to 0.02A after about 5-10min after locking

hcmzah:

--- Quote from: mjmallia on April 10, 2025, 08:06:14 am ---The rain sensor saved me a lot of current draw.  Mine had the rain monitoring option on for windows, so it was always checking to see if it was raining and had access to the module to close the windows even when locked.

--- End quote ---

I had a look at my long coding in VCDS for central electronics and central convenience but it seems the monitoring is set to inactive already (I don't have a sunroof)


--- Quote from: OllieVRS on April 13, 2025, 04:23:32 pm ---Unplugged all the passenger door connectors as I had a door light fault code, wasn't that, so I unplugged the next thing causing a fault code, alarm siren. Turns out it was that  :grin: now down to 0.02A after about 5-10min after locking

--- End quote ---

Nice one! I've read that's one of the most common problems. My alarm seems all good (goes off when it needs to).

I've checked all interior lighting and nothing is staying on, so I'm still puzzled  :laugh:

OllieVRS:
You've checked all the interior fuses too?

Unfortunately I don't have any other suggestions, bar an unorthodox one, ask ChatGPT. Tell it the car model (MK5 Golf), tell it what fuse it is and what you've tested already. This is how I decided to check the door connectors and then the siren, following my AI overlord's commands  :grin:

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