check your 12v Auxiliary Battery self test (Toyota Prius)

[@chuckles470s9]

Extremely helpful. Thank you

[@markwilliams3140]

Thank you for posting this video, very helpful. I have a 2009 Prius with the same console layout, did not even know Prius had a diagnostic to check the 12 volt battery status, until I found it on KZbin. I did this test yesterday, and found my 12 volt battery below what it should be(as I suspected) as the car is about 10 years old(I've had it about 4 years), and don't think the 12 volt battery was ever replaced., I ordered a new battery yesterday, after I did the test, was due for a new one anyway. My Prius, with about 178,000 miles on it had been running rough for a little while now, and I believe the current battery was a big factor. Again Thank you so much!!

[@treeverowe2074]

Sooo, grateful for finding this. Nearly the same set up on 2016 Rav4 2.5L Hybrid as I just worked it out. Having starting issues for a month, knew it was aux battery as car fuel pump priming slowing when entering car. Turned off all accessories, lights etc. Press power button twice. Wait for inititiation. (I already had master warning triangle illuminating) Press display knob in (not stereo on knob) and flick lights on/off three times. Multimedia panel goes into diagnostic mode. Scroll through to aux battery check..... 9.9V !!!!!! Warning on instrument cluster says "temporary limit on A/C heater power" After a few seconds the main Hybrid battery kicks in and puts Aux battery up to 14.5v to charge it. Needs to wait like this before the car will drive anywhere as the reference voltage also affects the many position sensors in the vehicle like in the transmission and the vehicle tells you to put it back in park. It's a 4yr old AGM battery, very low capacity (45Ah 325cca) for such an electric hungry Rav4 Hybrid. Car has auto everything including boot hatch and we get temps from -10 C to +40C, which isn't extreme, but for all the demand from this vehicle, it's definitely a battery that's designed for finite cycle capacity. But I am the second owner, who knows what the previous owner did with it.

[@alexmarks4593]

It's very important to note once the car is fully turned on the voltage reading is picking up the hybrid battery voltage. The important numbers for your aux battery come before turning the car on while pressing the brake.

[@larrycanonga7800]

thanks for the info

[@triple_gem_shining]

So for me it seems low. 11.2-11.9 ...

[@angels.9386]

THANK YOU I JUST BOUGHT A 2008 PRIUS YESTERDAY I WAS AFRAID OF THIS JUST CHECK MY BATTERY IS GOOD TO GO!!!!!

[@hybrid32494]

hey buddy! welcome to the Prius Club!! lol. Now you could be getting over 50 MPG and never worrying about gas. Watch my other vids on this car, I guarantee you then will be fun and some will be useful. Mine has 150K and not one issue ever.

[@dastorm4230]

Very nice video! Thank you! Works for my Toyota Prius Plus 2013. My display is different and I just hold the MEDIA button while blinking my lights to enter. 😀

[@nitrogang4416]

Super glad I came across this useful comment, I will try this on my prius too. thank you!.

[@dustyh2371]

Thanks for posting this video. It is really helpful to us fellow Prius owners.

[@hybrid32494]

thanks for watching my fellow Prius driver!!!

[@nitrogang4416]

Great video, very useful info for the prius. thank you!.

[@hybrid32494]

Thank you, glad to know this video helped you out!

[@tempebill8183]

Heading into hot weather here in the Phoenix area(Tempe), and wanted to check the status of my 2008..I think it's still on it's original and don't want to be caught unaware(s).. Thx alot guy!!

[@hybrid32494]

you got it!! thanks for watching.

[@MrSunnyBhoy]

That's great, I thought you were about to do some sort of magic trick with the flock the lights on 3 times quickly lol, will try this once I get my new 12v installed

[@hybrid32494]

hey buddy! glad to have showed you a highly useful feature of this car. No magic tricks unfortunately, but I should learn some.

[@rfhendrix]

Worked fine on my 2005 Prius. Thanks a lot.

[@03214590028]

My right hand drive Toyota prius navigation in japenese language can some one help me out to shift or change into English language. Some one help me?

[@hybrid32494]

thanks for watching!!!

[@hpmoxie4660]

Like the discussions here with real-life readings so I know if my reading is below par. Thanks

[@xHomu]

No bs, clear explanation! Great video!

[@nitrogang4416]

Totally agree!! Great video.

[@Bossjames03]

Does anyone know what battery would be the cause if it didn't supply enough voltage to my brakes. And also that my car will no longer turn on

[@hulagun]

Thank you, very clear explanation. My battery may be too dead to test, but I will use in the future. :)

[@hybrid32494]

glad to have helped, have you actually tied this, it should still work even if the batt is weak.

[@SubiM1999]

Hi. Mine 2008 prius.12.00v initially. Dropped to 11.9, 11.8, 11.7. Third step 14.00v. Do i need to change my 12v battery. I live in Wellington. Thanks

[@PiotrKravi82]

W Auris 2 to działa?

[@waheed3894]

My prius triangle 🔺️ vcs break check engine lights come on while I am little over speed but the car still drives ok so I do unplug the axillary and hybrid battery, and putting back that all lights turned off do u think it would be the 12v battery failure?? Please 🙏 response thanks so much

[@TheNotthead]

I thought the number with the car on was the hybrid battery? And the one with it off was the 12 volt? Both readings are for the 12 volt?

[@konardkonrado7755]

is this shows also youi main batrery pack voltage ?

[@waheed3894]

Thanks for the info I have checked out mine is showing 11.9 and 12volt so should I replace my axillary 12 voltage battery please advise thanks

[@brentboyd4906]

Great video, once my new display comes in I'll do this.

[@tyashaalston2457]

2008 Prius mines read a 11.7v am I replacing the hybrid battery? Or the 12v battery?

[@chamur07]

Thanks for this video. My prius is 2005 and battery 10.0 voltage but it looks like drivable. Do i need to change? But at the second step it is 14.0

[@H-Town_Rides]

Awesome! Thanks for revealing this feature.

[@hybrid32494]

you got it!! thanks for watching.

[@Nahhmah]

It showed 11.7v during first step; 11.4v at second step; and 14.2v during engine on. Do I need to replace my Optima battery? The battery is from 2012.

[@hybrid32494]

hey man!! 11.7 is not terrible. Your hybrid battery is good. I'd say that when winter hits you might have an issue because it will probably hit under 11.5 by then in the cold.

[@mractive420]

My battery is saying 11.9 when I just push it once went I start it it goes to 14.1 do u think I need to replace battery?

[@hybrid32494]

hey buddy! that is still drivable and should be good for a while. As long as your car starts normally there is no need to replace the battery. Under 11 Volts it should be def replaced.

[@miketan2459]

no. thats normal

[@mractive420]

Ok cool thanks my dash went out and heard it might be the 12 v battery

[@williamscolaro1159]

How can I enter this diagnostic mode on a 2013 without navigation?

[@markmaple8953]

I watched your testing 12v battery system and it all checks out but when I start the car and drive the lines on my battery ( on display) will go all the way down to one line purple and then at freeway speeds it loses power any ideas?

[@vanessasaucedo7885]

Did you ever figure this out? I know this comment was over a year ago but I am Currently experiencing this, although I did basic maintenance like spark plug change, trans fluid change, and an oil change and its seemed to help. Still curious to though since this is the first time I see someone post the exact problem I'm having, literally only happens on the freeway.

[@redamohamed4759]

The same problem here, did you find the cause please? Thanks

[@robertbolivarr8363]

I have a 2008 Prius, and when I press the menu button nothing happens. Does anyone know why? Thank you guys.

[@eliasragi7472]

thank you for this very useful video, and I would be grateful or advice on if the petrol engine, when revving, is actually charging the 12V battery. Thank you

[@hybrid32494]

Hello, if you drive with this mode, you will see that the battery voltage will mostly remain the same when your gas engine is on or off. So there is no alternator. I did not notice any voltage changes when the gas engine kicked in.

[@eliasragi7472]

Thank you. Very useful advice as I was expecting some voltage increment (keeping the diagnostic screen on while driving), but no rise beyond the 14.3 V. I have the 2008 model and, my mileage being low, the car seems to east 12V batteries unlike any of of the previous I have had (over forty years). The third battery change on this Prius was few days ago, after only three years and only 3000 miles since second battery. Local Toyota offer no clear answer and I am uncertain if they can find out if the 12V battery is actually being properly charged. I shall thus get some dedicated voltmeters / 12V battery analyzers and try to find out myself. Thank you again for your video and advice.

[@BikeTall]

Very cool. I am about to buy a Gen 3 Prius tho(2010-2015)... can you easily do this check on those models?

[@nitrogang4416]

hey buddy! I read in the comments here somebody said to hold the MEDIA button and do the same light process as shown in this video, it should work. Good luck!.

[@gustavocasas3378]

Thanks 👍 video where do you live?

[@skhirtladzee]

hii I have 2008 prius canadian when run engine headlight is on I want to turn off light can you help me?

[@hybrid32494]

hello, are you sure your car does not just have daytime running lights. I know some of the Canadian models the lights cannot be turned off. The real taillights should still be off though. Check, and let me know.

[@Oliver-lh8ly]

I got 11.6 volts initially so it looks like I do need some work done on the battery. When I started the engine it still went above 14 volts like it is stated in the video. Does anyone know how to interpret these results and also is there a good place to buy individual cells to put in the battery? Also how would I find out what cells are bad?

[@hybrid32494]

hey man!! You just need the regular 12V auxiliary battery, it's a Gell battery in the back of the car. You don't need any cells in your traction battery (hybrid battery) if the voltage jumped to over 14V on startup. You just need to go get one from the dealership, They are around 300 bucks in my area. let me know how it goes.

[@markwilliams3140]

@@hybrid32494 I just ordered a new 12v battery through "Interstate Battery website" for 2009 Prius for about $195.00, online & and through a parts store would have been about $240.00. Just pays to shop around, and compare prices(they are pricey anyways).

[@PRodLyftz]

11.9 for first test, and 13.9 for second. Thoughts? Edit, also read 12.2 before I did any tests

[@hybrid32494]

hello, that's ok. Still within range. I'd say check every 3 months to monitor the voltages.

[@PRodLyftz]

Thanks!

[@byronhobson4298]

That’s what mine did.. 12.2, 11.9 and 14.3. Original battery... 11 years and 207,000mi driven.

[@17genc]

Hei, Do you think 12v battery might be an issue that i am averaging so high on consumption 6-7liters on mixed driving wich i think is unacceptable, My car has very low mileage 86.000km or 53.000miles and is Gen 3 (2011)? and also fuel guage was telling me i will go empty in 27km when infact i had 10more liters left since i only filled 35liters and Prius capacity is 45 hope you can help!!

[@Kmoneymurdakilla]

It's the "Info" button that takes me to the Diagnostics screen on my 2006 Prius.

[@Fregatte86]

Got 11v in stand by mode. It's -20 c now. But car is launching as normal. If voltage drops below 9v under load, all systems is rebooting, because voltage is rising without load

[@jennywalker4139]

What if it’s is 12.1 on the first step but drops to 11 on second step then to 14.5 on third?

[@hybrid32494]

hey! I would say your 12V battery is still normal. As long as it starts the car the Hybrid Drive battery will kick in right away (thats when you see it saying 14.5). My 12V battery is going on about 7 years now, still fine.

[@jennywalker4139]

hybrid32494 hurray! I only wondered because I felt hestitation in acceleration when driving up a hill at high speeds ... I noticed lower bars and I was concerned... it might be the spark plugs or the fuel injectors...

[@rollerbro3216]

On third is 14.1/14.0 good?

[@fanelli57]

Once the car goes ready it's no longer showing battery voltage it's showing the charging voltage being applied to the battery. The best test you can do in the is to watch for that momentary dip in voltage between when you start the car and when the charging voltage comes on line. If that voltage drops below 10 volts you can expect problems starting the car with red triangles and various lights on the dash. 10.8v is dead for a lead/acid battery.

[@JonnyHavens]

Great video, thank you! I checked my Prius this morning in 6 degree Fahrenheit weather, the first step showed 12.0V exactly, but when I pressed the button again, it went down to 11.3V-11.4V. When I started the car it showed 14.5V like yours did. Is it normal for the battery to have less power in freezing temperatures, or should I take it in to get looked at?

[@hybrid32494]

Form my experience the 12V battery is always a problem in cold temps. I would say that if your is able to power the car on normally and you drive frequently enough to charge it then it'll last till next winter. I got a price quote over the week for the 12V battery, and TOYOTA quoted 299. So basically double-triple the price of any normal battery.

[@JonnyHavens]

hybrid32494 thanks, really appreciate the reply!

[@hansvargas5561]

Mine is reading 11.4v is that bad???

[@Deathcabforeli]

My Prius won’t let me shift to D or R and I did this test on it before anything else and my battery voltage was low, is the battery the reason why my car won’t drive?

[@hybrid32494]

hello, is your dashboard illuminated? Do you hear the typical clicking noises when you first start your car with the push button? IF you don't hear the clicking and the car won't let you shift/ or dashboard is not illuminated then you need a new 12V aux battery. The 12V battery is responsible for all the power system before the main hybrid battery is operable. let me know, thanks..

[@Deathcabforeli]

Everything turns on and it shows all the warnings signals on the dashboard too I don't hear the clicking noise though.

[@hybrid32494]

if theres no clicking noises as normal that means your fuel and other realys are not switching on and car will not start. It needs more juice, your best way to check for sure is to jump start it. If you jump it and it starts then you know it's your 12V battery that is weak.

[@saulamasicola8566]

Bro my prius 1.8 theres no power at all,I cant on anything. I've tried they key close to the power button still nothing.. what can I do nxt?

[@hybrid32494]

hey man!! You need to jump it. I had mine die once (like 7 years ago). The 12V battery was just dead. You need to find the remote battery terminals in the front of the car (google it) and jump it. Then you can see if it is just a bad 12V battery. Let me know.

[@saulamasicola8566]

Thanks bro my 12v battery terminals were loose thanks man... didn't have to jump it

[@miamicyclist01]

It wouldn't work for me I have a 2008 Prius with the display button on the right side not the left. Held the button in and turn the lights on and off 3 times. The screen just goes back to where it was before...any suggestions?

[@hybrid32494]

did you make sure your car was displaying the odometer before? Your model doesn't have the nav system -thats why your buttons have a different layout. The process is the same, I checked out another video with your setup, here you go, seems to be the same. kzbin.info/www/bejne/pKnKlmuIiKqYkKc

[@varuninnz]

Hey mate, it's been winter here in Australia. So I'm not if this has entirely been the issue. I have been having the VSC, Malfunction indicator lamp on along with the Red Triangle for ~4 weeks now. I checked my battery in step one Non Accessory mode: The battery showed 11.6 or 11.7 -> FAILED Accessory mode: It was around 11.5 or 11.3 -> FAILED Running mode: It was 14.3 -> PASS My question, Is my battery ok or no given the information above? FYI, I am trying to solve to these error codes without going paying a fortune at the dealership. My suspicion is these could be occurring due to a weak battery. C1241: Low battery positive voltage or abnormally high battery positive voltage C1249: Open circuit in stop light switch circuit C1377: Capacitor Malfunction

[@hybrid32494]

hello, definitely looks like your 12V aux battery is low and not taking a charge well anymore. The running mode voltage about 14V is good, a sing that the main hybrid battery is fine. I find that these 12V gel batteries die every 4-5 years. Your symptoms sounds correct for a weak battery too.

[@varuninnz]

Thank you for your prompt reply. Ok I will get it replaced. Hopefully then these errors will also disappear. Have you by any chance encountered these errors, C1241, C1249, C1377?

[@allenthomas914]

When I did the test before starting it it said 11 volts then when I started it went to 14

[@christianmartinez8700]

Hey can we get an update I’m having the same problem

[@rondhole]

Only in warm weather >12V is a good parameter. In cold weather, the best number is not the maximum voltage but the voltage reading under load. As long as it is above 11 V when the ignition is on, it is OK. If the headlight+heater/defroster+AC blower are all on, it should be still above 10V. This is the best parameter, not the voltage without any large load. Bad battery often shows ?>12V and drop under 10 V, often as low as 8V when under load.

[@waheed3894]

I did the same diagnostic as video says, min show 11,9 I don't no should I replace battery or no the car starts very good just couple time during driving over speed my vcs,break, and triangle comes on but every things was working, I unplug all power from both battery's then all warning lights turned off so any info advice much appreciated you please 🙏

[@rondhole]

@@waheed3894 When the battery ever dropped below 10V at any given moment, you will get Christmas lights including some warning about transmission etc. So, change the battery with a genuine Yuasa or Toyota battery. Aftermarket AGM battery is hit and miss and never put wet cell in the trunk. It is a safety hazard for passengers and cars.

[@waheed3894]

Thanks so much for the info you answered one more question which I had ann wasn't asked really appreciate, God bless

[@hamzaabdullah7727]

Hi , thanks for information do you know if it will work for a 2012 Prius as well ???

[@hybrid32494]

Good question, Not sure. Try it, do you have the same display buttons? I don't see why it would be different otherwise.

[@anthonytruman]

I just did this and my battery started at 12.1V. Then when I pressed it again it dipped down to 11.8V. Then when I started the car it went up to 14.1V . Do you think it is good for now or should I get a new battery soon?

[@davaanyamganbold1622]

how did it go? did u get a replacement or the old battery is good

[@anthonytruman]

@@davaanyamganbold1622 haven't had any trouble with my 12v battery. Did have to replace my hybrid battery but that was because water got to it somehow. But that was a while after I made this comment and it drove fine until then

[@davaanyamganbold1622]

@@anthonytruman oh really. btw thanks for ur answer just bought my pruis yesterday and had same result as urs :)

[@anthonytruman]

@@davaanyamganbold1622 no problem. Hopefully it works out well. Besides that water getting to the battery it has been one of the best cars I've ever had, just needs regular maintenance. If you ever need a new hybrid battery I recommend green bean battery if you are in the U.S.

[@danielmalloy6093]

Problem is my touch screen needs to be calibrated. So even if I get to the maintenance screen I wont be able to check the battery.

[@tomplucknette5941]

Thank you Sir, Very Helpful

[@nitrogang4416]

YEs, great video and useful, you're right.

[@robertlongoria765]

Saved my bacon! Thanks!!

[@hybrid32494]

hey, glad to help. Thanks!!!

[@احمدالحيمي-ف8ذ]

Mine is 14,1 Is this good or very good?

[@hybrid32494]

hey buddy! Yes, that is fine. Ive seen some models go as low as 13.7 and still be fully operational.

[@triple_gem_shining]

@@hybrid32494 so below 13.7 is when you need new battery cells for the nimh battery? Mine is right at that level and showing signs of weakness

[@0zvm1]

My 12 volt was at 11.7 before powering the car on and 13.8 when powered on. Is that low enough to warrant getting a new battery?

[@hybrid32494]

hey buddy! I would say to just keep driving until you notice it not starting at all. Those 12V Gel batteries are pricey and only sold by the dealer. My dealer quoted me 350 bucks, crazy. Under 11V then yes, you would need to replace ASAP.

[@04soek]

hello i have a prius 2008 since two days i have the engine light with red triangle and sometimes the vsc comes on but my screen its broken the codes i have is p0a93 c1241 c1242

[@vmi4172]

I got the same exact codes right now! What did you do????

[@rondhole]

#with ignition ON, above 11.5V is still good battery and will start the car without issue.

[@vaclavsojka1638]

Super 😉 Dekuji 😉 thank you ! 😉

[@judywinters8615]

I did what you said and o step two ot 0lunfed to 11.9 and 11.4....then back to 12.4. Then I step three it went higher...like q4. I just paid a guy to put in a "new" 12 voltbatyerybut am Frzid I for scammed as it died yesterday

[@hybrid32494]

No worries!! You got it!! Thank you for watching btw.

[@ChasinSimplicity]

Great tip thank you

[@hybrid32494]

sure, thanks for watching!!

[@ChasinSimplicity]

hybrid32494 anytime. Just got a Prius and making sure all the bugs are worked out. Does your brake actuator clatter when you depress the brake pedal fairly regularly

[@hybrid32494]

hey, yes, the brake actuator always makes some noise, it's normal. Mine actually failed once and it was covered by a warranty enhancement from Toyota, you should check out if you have that problem. Otherwise it's just building pressure and always makes some noise, even after mine was replaced.

[@ChasinSimplicity]

hybrid32494 appreciate the feedback. I don’t get any error lights and from what I have read it seems like a normal Prius sound. I appreciate the help.

[@yvonneellefson]

Verified works on 2009 Toyota Camry Hybrid. Thanks!

[@chromatica5494]

Thank you 💛

[@hybrid32494]

thanks for watching!!!

[@maryfiermonte3583]

Great info

[@hybrid32494]

hey buddy! thanks for watching!.

[@nitrogas5719]

Hmm, pretty neat feature, let’s see if it works on a 2007 hybrid Camry 36mpg all day long!

[@hybrid32494]

hey man!! YUP, this Prius is pretty dope when it comes to useful built in features and reliability. I get about 50+ MPG regularly. I've saved so much money on fuel over the years that I don't even worry about buying used nitro RCs, anymore, ahaha.

[@juniorsavoy1010]

How do i check a 2011 ?

[@hybrid32494]

hello! sorry, I cant give yo any advice on that. Ive never tried this on a newer model prius.

[@17genc]

@@hybrid32494 Do you think that is possible that my 12v battery is lying about my mileage? i am only getting 36-39mpg or 6 liters sometimes 7 wich i think is unacceptable for a Prius gen 3 (2011) with just 86.000km or 53.000miles

[@hybrid32494]

@@17genc hey man! I have not come across a single Prius That has wrong MPG info. Its more likely that your style of driving and conditions just include mostly start and go, with not many miles in between, am I right? The first 5 minutes in any car they are the least efficient, same with the prius. I would say if you had a basic 4 CYL car you would get even worse fuel economy in your type of driving.

[@17genc]

@@hybrid32494 I have driven 2018 Yaris and C-HR for two weeks or more short trips and long ones i know they are newer but the consumption was contantly saying around 3-5liters max thats why i am suprised it showing higher than i expect same driving style and short cycles also, I did drive on motorway and went around 5.8 mostly i think it should be lower i believe, Also with C-HR same tank capacity as Prius did do 700-800km mixed driving but with Prius even on motorway maybe 500-600km max

[@devanyherrera2773]

Lo puedes poner en español

[@MandoRdgz]

Awesome!!!

[@26bisVotanhRG]

Brilliantly

[@BC99]

Thanks.

[@hybrid32494]

You're welcome

[@19swaggkidd]

my car reads 11v but still runs and drives fine

[@hybrid32494]

hello, 11 is on the low end for sure. Chances are in the winter time if you live in the colder states it will need to be replaced. While it's warm out, it seems to be fine. Thanks for watching!!!

[@19swaggkidd]

hybrid32494 it could be my terminal as well i had to tie it up with electical tape

[@hybrid32494]

hmmm, IDK, a bad terminal or connection would not really lower your output voltage, possibly it would just be intermittent. Anyway, how's the car now? I need to get mine replaced this winter.

[@19swaggkidd]

hybrid32494 still driving fine starts and drives normally in 10° weather

[@Angryjoe265]

All you need is to get a USB power plug that has a display.

[@UncleHoCM]

👍

[@hybrid32494]

thanks for watching buddy!

[@rondhole]

11.8 V is the limit after we drive 30 minutes

[@seniorhybrides-h7620]

Hello Problème code p31ab Prius plus

[@bv2745]

Too bad this wasn’t a way to check the hybrid battery. A 12v is cheap and easy to replace buying a used Prius the most important thing to check is the HYBRID battery

[@hybrid32494]

hey buddy! you can indirectly check the voltage your HYBRID drive battery is putting out when you power the car on, you will see the voltage will jump to around 14V, this is showing you your HYBRID battery is fine. Since this car has no alternator, it uses the voltage from the Hybrid battery right after startup from the 12V pack. and BTW, the 12V gel battery cost about 350 to replace from the dealer, and there are no aftermarket ones for this car that will not void any warranties or are a direct fit.

[@bv2745]

@@hybrid32494 Cool thanks!

[@BtheDUB]

@@bv2745 This isn't a good check for the hybrid battery. priuschat.com/threads/how-to-test-the-hybrid-battery-condition.176496/ is how I figured it out for me. A laptop or an android phone + a $15 OBD wifi reader will tell you everything you need to know.

[@fishcookies]

very thankful, thank you so much