All Things Mk5 > Mk5 General Area
Parasitic battery drain
hcmzah:
Hi all,
Struggling with this battery drain I have. Car is drawing 150mA when off. If I pull out F48/SB48 from the engine bay it drops to around 20mA.
The fuse is for the Vehicle electrical system control module (j519). It seems like this controls a lot of things.
I've done a scan with VCDS and I do have a code for the passenger rear door control module - defective. However, I've disconnected this and the draw is still there. Also tested fuses for this.
Does anyone know what F48 controls? Or any advice? Thank you
2007 BWA, Manual
hcmzah:
Any ideas anyone? :sad1:
OllieVRS:
I'm in the same boat trying to pin point a battery drain issue, I've been using this for finding out what each fuse does, very handy https://www.startmycar.com/us/skoda/octavia/info/fusebox/2007#anchorfusebox2
mjmallia:
Have you been checking the car after it has rested for a couple of hours (bonnet popped and switch tricked into being closed, doors closed and car locked), as various modules go into deep sleep at different stages.
hcmzah:
I found that the J519 aka F48 should control the following (and probably more, which I don't know):
Electrical load management
Parking light
Dip beam
Side lights
Turn signal indicators (not in exterior mirrors)
Main beam
Additional main beam
Fog lights
Footwell lights
Dimmers, instrument lighting
Hazard warning light system warning lamp
Relay for headlight washer system
Fuel pump presupply
Horn
Dual washer pump
Interior lighting
Rain and light sensor power supply
- I'm going to try code out the rain sensor with VCDS and see if that drops the mA. If not I'll try unplugging it too
--- Quote from: OllieVRS on April 09, 2025, 01:49:59 pm ---I'm in the same boat trying to pin point a battery drain issue, I've been using this for finding out what each fuse does, very handy https://www.startmycar.com/us/skoda/octavia/info/fusebox/2007#anchorfusebox2
--- End quote ---
Thanks, do you know which fuse is causing trouble for you?
--- Quote from: mjmallia on April 09, 2025, 02:01:38 pm ---Have you been checking the car after it has rested for a couple of hours (bonnet popped and switch tricked into being closed, doors closed and car locked), as various modules go into deep sleep at different stages.
--- End quote ---
Yeah I've latched everything and the first time around I left it for 2 hours and it settled to 150mA. From then on I just waited around 25m for it to hit 150mA.
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