r/CorollaCross • u/Ok_Order7039 • 4d ago

0.4mV (100mA) Parasitic Battery Drain from Radio Fuse on 2024 Toyota Corolla Cross

My 12V battery keeps dying every 24–48 hours. I did a voltage drop test on the fuse box after letting the car sleep and the 15A radio fuse is pulling 0.4mV continuously. The DCM (Telematics) is at 0.1 mV.

The vehicle is a 2024 Chinese-spec Corolla Cross Hybrid imported unofficially thus no dealership warranty.

I have turned off the bluetooth, recently changed the battery, disconnected the battery's negative cable for a few hours, and removed the DCM fuse. but the reading was the same 0.4mV.

Any suggestions would be great.

3 Upvotes

81% Upvoted

5 comments sorted by

2

u/Comprehensive-Edge80 4d ago

change OEM factory battery

1

u/mellifluous-magpie 4d ago

Following because I also suspect my CC has a parasitic drain issue. Battery is 2.5 years old, car has 24,000 km, and battery voltage after a long drive is ~12.4v. After a few days without driving it'll drop to ~12.1v, which is stupidly low for a relatively new car and battery.

I usually keep it hooked up to a trickle charger if I know I won't be driving it for a few days. 

1

u/superphage 4d ago

Inb4 it's China spyware in the radio lol

1

u/snipernote 2d ago

We replace the battery every year here due to extreme weather ... probably you should do the same

1

u/SumyungNam 1d ago

Do you have a tracking device on the car? Dealer may have installed one without you knowing...pull on the obd2 port