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· Registered
Hyundai i30 2009 1.4 Petrol
1 Posts
Discussion Starter · #1 ·

I've been diagnosing a battery drain and I've hit a wall with my knowledge...

I've put a brand new battery into my car and it was dead within a week with little driving, I've tested the alternator and that should be fine (Charging 14.6v).

I set my multi-meter for amps and I was getting a 0.4 drain, I've systemically pulled fuses and noticed that after pulling the Room LP fuse, the draw drops to 0.001. What I noticed recently is that one of the dash lights seems to be permanently on as below, but the fuse being pulled turns it off.


I noticed as well that when I use the key to unlock the car, this image appears with the rear-left passenger side saying the door is open;


I've removed all the lamps in the interior that I can find (Boot, dome, map, compartment and above the visors) and it doesn't seem to be any of them, at this point I'm a little stumped as to what be causing the issue. I've read that it could be a dodgy wire / ground from this point somewhere else causing the issue, or a problem with the BCM, I was debating taking it into my local garage, but was advised it could be quite costly to repair.

Annoyingly, pre-covid, this likely wasn't an issue as I was driving my car nearly every day and it was getting a good run, but it will sit in my space for up-to a couple of weeks some times as I don't need to drive right now.

Has anyone got any thoughts on what I may be able to do to troubleshoot this further?

· Registered
2012 Civic Si Sedan
164 Posts
If exactly the same
Without opening the car doors, is the dash light still on before car is unlocked AND for more than 10 minutes after it's locked? If so then I'd suspect the culprit is the door switch or its ground. If you can access the switch just exercise it and see if indication goes away when the door is closed. You can also partially remove the switch and ground the wire to see if the indicator clears. Otherwise the BCM ($$$$) is the next, but unlikely, culprit.
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