Topic: 2020 Toyota Rav4 Hybrid

[PJungnitsch]

Sounds like it might be the automatic parking brake:

11 d ago (Edited)

    RAV4guy123 said:
    So everyone with the battery issue, can you try disabling your automatic electronic parking brake? Someone stated that it was a problem in the CR-V and the software updated fixed the problem by doing this. I initially had a RAV4 hybrid that wouldn't start and had to carry a battery pack. After I disabled the automatic electronic parking break, I haven't had the issue come up again. If you ever need it, you can turn it on manually. Just seeing if this can possibly be the fix we're all looking for!

    How to turn off the automatic parking brake:

    You don't need service to turn the auto EPB off, see page 224 in the HV manual.

THIS!(y)

2020 RAV4 Limited Hybrid here (with a former flight test aircraft electrician for an owner). We were consistently ending up with a dead car (~4v to ~5v) after 3.5 to 4 days time of non-use. This happened several times. During a couple episodes I measured the battery voltage every day. Here's an example from one:

Code:

3/31 21:00 12.3v (fully charged)
4/01 17:30 11.7v
4/02 23:59 11.2v
4/03 15:00 10.6v
4/04 11:30 4.07v (vehicle is dead)

As you can see, the battery was losing about .5v each day. (According to Battery Tender a 12v lead-acid battery will read 12.9v fully charged with no load, and 11.4v when fully discharged with no load -- so losing .5v every day is consistent with a 12v lead-acid battery that completely discharges under "parasitic load" in 3.5 to 4 days.)

For the last week or so we've just been leaving it plugged into the Battery Tender (since we're not driving it enough in the current situation to avoid consistently having an unreliable vehicle). Yesterday afternoon (with the battery fully charged) I disconnected the Battery Tender, turned the automatic parking brake off, and measured the voltage (12.55v). Fifteen hours later I checked the voltage again and it was still 12.55v. Which, is enough evidence for me. I'm now convinced the electronic parking brake is the culprit in our case.

https://www.rav4world.com/threads/2020-hybrid-starting-issue-due-to-battery-drain.303771/page-8

[Great_Big_Abyss]

I passed that thread on to her.  Thanks

[EV Dan]

Great find, PJ! I should probably take mine off the e-brake, maybe it does draw some current although it's not as drastic as with the Rav in question. On an 7 y.o. battery I still get above 12v after a week of the car being parked.
P.s. a fully charge battery measures around 13.2V.

[dirtyjeffer]

wait...the electronic parking brake means the mechanism that is "holding" the brake is always on??...i assumed the "electric" part was simply the mechanism to engage it, and once engaged, it was in a mechanical lock of some sort...seems like a bad design to have something that will always have a parasitic loss on the battery...i guess you can just not use it, but what if you need to use it?

[Great_Big_Abyss]

wait...the electronic parking brake means the mechanism that is "holding" the brake is always on??...i assumed the "electric" part was simply the mechanism to engage it, and once engaged, it was in a mechanical lock of some sort...seems like a bad design to have something that will always have a parasitic loss on the battery...i guess you can just not use it, but what if you need to use it?

I'm pretty sure that the EPB only needs power to engage/disengage, by design.  What is most likely is that there is some fault either within the EPB system, or something to do with software, that is causing this. 

[z973]

Last September I parked my car for 32 days and when I came back to Canada no problem at all I don't think it's an e-brake problem

[Great_Big_Abyss]

Last September I parked my car for 32 days and when I came back to Canada no problem at all I don't think it's an e-brake problem

Your Mazda?  Yeah, I realize that most vehicles with EBP's don't exhibit this type of power draw.  That's why if this ends up being a problem with the EBP, it's something that Toyota should work towards fixing.

[dirtyjeffer]

wait...the electronic parking brake means the mechanism that is "holding" the brake is always on??...i assumed the "electric" part was simply the mechanism to engage it, and once engaged, it was in a mechanical lock of some sort...seems like a bad design to have something that will always have a parasitic loss on the battery...i guess you can just not use it, but what if you need to use it?

I'm pretty sure that the EPB only needs power to engage/disengage, by design.

well, that would make the most sense, but i'm not familiar with those as none of my vehicles have had one.

What is most likely is that there is some fault either within the EPB system, or something to do with software, that is causing this.

hopefully it's just that, as it would be a pretty easy fix.

[Brig]

Very cool, PJ!  I love it when a solution is found and shared.

[z973]

Last September I parked my car for 32 days and when I came back to Canada no problem at all I don't think it's an e-brake problem

Your Mazda?  Yeah, I realize that most vehicles with EBP's done exhibit this type of power draw.  That's why if this ends up being a problem with the EBP, it's something that Toyota should work towards fixing.

yes

[EV-Light]

This must be awful eh?! One buys a Toyota expecting to never have any major issues and then all of a sudden your vehicle randomly doesn’t start...

Sounds like the same kind of issues Tacoma owners are experiencing with their transmissions...

So much fun!!!


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[rrocket]

! One buys a Toyota expecting to never have any major issues

Which is by and large the case.

[CSH]

Agree, although not perfect, by and large toyotas are super reliable (based on my experience with a 2007 camry).
I take the bmw for a quick spin in the neighbourhood and idle it for 10 mins once a week.
Yesterday several lights came on in the dash.. shuddering to think about the repair bill

[rrocket]

Agree, although not perfect, by and large toyotas are super reliable (based on my experience with a 2007 camry).
I take the bmw for a quick spin in the neighbourhood and idle it for 10 mins once a week.
Yesterday several lights came on in the dash.. shuddering to think about the repair bill

That still could be from a weak battery....

[Great_Big_Abyss]

This must be awful eh?! One buys a Toyota expecting to never have any major issues and then all of a sudden your vehicle randomly doesn’t start...

Sounds like the same kind of issues Tacoma owners are experiencing with their transmissions...

So much fun!!!


Sent from my iPhone using Tapatalk

The difference between us and you, Tauri, is that we are truthful and honest when it comes to our vehicles' flaws.  We don't try to sweep them under the rug, or exaggerate performance in order to inflate our egos.  When a brand we like, or vehicle we choose has flaws, we point them out and address them.

You, sir, do the opposite.

[rrocket]

This must be awful eh?! One buys a Toyota expecting to never have any major issues and then all of a sudden your vehicle randomly doesn’t start...

Sounds like the same kind of issues Tacoma owners are experiencing with their transmissions...

So much fun!!!


Sent from my iPhone using Tapatalk

The difference between us and you, Tauri, is that we are truthful and honest when it comes to our vehicles' flaws.  We don't try to sweep them under the rug, or exaggerate performance in order to inflate our egos.  When a brand we like, or vehicle we choose has flaws, we point them out and address them.

You, sir, do the opposite.

Oh..and don't forget decades of data (both consumer and 3rd party) backing up those reliability claims.

If he really cared about such things, he wouldn't have bought a Ford.  F-150 recalls (5 already for the 2020 model), Focus RS blown up engines, dozen C-Max lawsuits and dozen recalls, botched Explorer roll out, etd. etc. And V6 Mustangs confused with V8s... 

He's just a troll...and we all need to learn not to feed the troll.

[EV-Light]

This must be awful eh?! One buys a Toyota expecting to never have any major issues and then all of a sudden your vehicle randomly doesn’t start...

Sounds like the same kind of issues Tacoma owners are experiencing with their transmissions...

So much fun!!!


Sent from my iPhone using Tapatalk

The difference between us and you, Tauri, is that we are truthful and honest when it comes to our vehicles' flaws.  We don't try to sweep them under the rug, or exaggerate performance in order to inflate our egos.  When a brand we like, or vehicle we choose has flaws, we point them out and address them.

You, sir, do the opposite.

Ohhh there’s no sweeping anything under the rug here...you a couple other Toyo fans just can’t take it, that’s reality...Look at the post right above LOL...#checkyourbias


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[rrocket]

...#checkyourbias

There's no bias....everyone thinks you're a troll.   

Everyone is in agreement.   

[ltruong]

 Man angry at the clouds

[EV-Light]

...#checkyourbias

There's no bias....everyone thinks you're a troll.   

Everyone is in agreement.   

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