macmaster

How do I check the health of the 12V battery of a 2015 CT200h from the on-board computer? I know on the Prius there's a series of buttons you push to see it but I haven't figured this out for the CT. Mine has the navigation screen if that helps. Thanks!

E46CT

I've never heard of that. I think you're thinking of the traction battery?

The 12V typically lasts quite a while on a hybrid cause it doesn't do much and doesn't have to spin an engine up. For peace of mind you can replace in at the 6-8 year mark. Some last longer, some don't. Just have to go with what you're comfortable with.

macmaster

Wait what? You've never heard of a 12V auxiliary battery? I'm talking about this battery:
My CT200h can barely start up anymore. After I charge the aux battery with a battery charger it'll start but I've been having to do this more and more. It won't even turn on after 3 days in my garage now. On the old Prius you could easily check the voltage like this:


You mean that doesn't exist on a fancy Lexus?

macmaster

Think I found it:

https://www.ct200hforum.com/threads/...e-menu.118564/

morganc

You could use a voltmeter on the battery, itself, or probe the power pins of the OBDII connector. Any OBDII reader/app can give you this, too. I'd just replace the battery, the symptoms are telling of an internal plate fault.

E46CT

Not every CT200h has a nav screen. So not sure how you'd even do that on those, or if that exists on facelift models. Best practice anyway is to use a voltmeter.

Raidin

What you are talking about is not normally available to the owner. This is a service menu, meant for techs and the dealer service dept. Most cars probably have something similar.