[zachary.weeks]

I purchased a 2019 Toyota Sienna XLE that has been wheelchair converted on December 16. Unfortunately, I have had two issues with the battery draining and going dead in the span of 24 hours. In my area, we have been experiencing temperatures of -35 Celsius, so it made it all the more difficult to boost the car battery. After taking my car to the mechanic, I was informed that there is a draw of 1 milliamp on the battery. When I had the wheelchair conversion system disconnected, it seemed that this wasn't the source of the drain. Unfortunately, even with the system unplugged, there still seems to be a persistent draw on my battery. The mechanic is unsure of the source, so I'm hoping that someone out there can help me find a solution to this problem. Any advice or guidance would be greatly appreciated!

 

[jareza]

your best bet is to hunt down the circuit that makes the parasitic draw. A multimeter and some time will be enough for you to find which circuit is the one at fault
Battery Dies Everyday: Testing For Parasitic Draw - YouTube
or you can stick a multimeter to your battery and start unplugging fuses until the draw checks zero

 

[goldenpiggy]

Does the van have an (aftermarket) remote start system?
Another thought is the bluetooth module is drawing current.

 

[3Wheelerguy]

The cold weather is not on your side to help this as a dead battery freezes basically like water at 0C/32F. Are you 100% sure the battery is fully charged? What conversion was your Sienna? Braun?
There is a lot that goes on into converting these vans. Guessing no MIL/CEL with the evap? There was issues with the canisters but MIL/CEL was on. Water or moisture in the pipes. With the cold may freeze up.

 

[3Wheelerguy]

Does the van have an (aftermarket) remote start system?
Another thought is the bluetooth module is drawing current.

Good call!!

Another thought is anything plugged into a USB port. Battery bank. Even a phone or ?? It will backfeed and drain the 12V.

 

[cougarhound]

I purchased a 2019 Toyota Sienna XLE that has been wheelchair converted on December 16. Unfortunately, I have had two issues with the battery draining and going dead in the span of 24 hours. In my area, we have been experiencing temperatures of -35 Celsius, so it made it all the more difficult to boost the car battery. After taking my car to the mechanic, I was informed that there is a draw of 1 milliamp on the battery. When I had the wheelchair conversion system disconnected, it seemed that this wasn't the source of the drain. Unfortunately, even with the system unplugged, there still seems to be a persistent draw on my battery. The mechanic is unsure of the source, so I'm hoping that someone out there can help me find a solution to this problem. Any advice or guidance would be greatly appreciated!

At 30 below aren't people using heating pads for their batteries? I read somewhere that guys who go hunting and stuff will bring out a bag of charcoal and light it up under the engine to warm things up.

Also 1mA sounds too low to be true for a modern car. It's usually 50-80mA. My old school 4runner is about 50mA.