Dead 12v battery Incident (merged threads)
#271
Intermediate
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I disagree, my previous 2021 X5 45E PHEV sat in the garage for weeks and sometimes over a month without being driven and never once I had to jump it. It had the same app and digital/proximity sensors/features as the RX450h+ (maybe even more, I love that I can unlock and drive that car just using my Apple Watch).
This is just **** poor battery management system that Lexus has.
This is just **** poor battery management system that Lexus has.
If a bigger sized battery or Lexus firmware update doesn't fix this, I may not choose to stay with Lexus long-term.
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autotech13 (04-17-24)
#272
Lexus Fanatic
#273
Intermediate
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If this was my vehicle I'd something like this
https://www.amazon.com/dp/B07WCW49YM/
https://www.amazon.com/dp/B07WCW49YM/
![No No No](https://www.clublexus.com/forums/images/smilies/nono.gif)
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autotech13 (04-17-24)
#274
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Mine 450h+ has been sitting in the dealership for 12 days. New battery did not do the trick. Today they declared they found the source of battery drain. It is a DCM that is bad. They replaced it. I have not gotten the car back yet but you may want to share this with your dealer. Since we are not the only unfortunate ones who had this kind of issue. My car is 1 month old. I am ready to turn it back to Lexus.
Yes, I sure will pass along that you had the same issue(s), and that is what they found. Fingers crossed this builds the Lexus engineering database, to create a quicker solution for those to come. Then on vehicles in production, changes the process to prevent from recurring for others.
Blessings
Rich
#275
Instructor
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Thank you very much for sharing what the dealer service dept told you, about changing a DCM. I truly hope that resolves it.
Yes, I sure will pass along that you had the same issue(s), and that is what they found. Fingers crossed this builds the Lexus engineering database, to create a quicker solution for those to come. Then on vehicles in production, changes the process to prevent from recurring for others.
Blessings
Rich
Yes, I sure will pass along that you had the same issue(s), and that is what they found. Fingers crossed this builds the Lexus engineering database, to create a quicker solution for those to come. Then on vehicles in production, changes the process to prevent from recurring for others.
Blessings
Rich
#276
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This gets back to the extensive tests that were done on your car. Find out from them what the cumulative parasitic draw that they measured and what does Lexus deem as normal draw. Not sure if you have done this but you can put an ammeter in series with the battery and see the spikes that happen quite often by the DCM transmitting. Just make sure your key is far away and put scale on 20A for initial spike and then reduce to ma scale. Mine jumps from 75 to around 200ma. If all seems to be in normal range then the battery is probably weak even if it checks ok but I think you have said the battery has already been changed. There will most likely be a software update to address the issue and no one knows they are working on the fix until it happens. Knowing what the draw was during there tests is important and not just the voltage drop.
#277
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I got one made by NOCO. 1,000 Amp seem more than enough to jump a 2.4 liter engine.
https://www.amazon.ca/dp/B015TKUPIC?...roduct_details
https://www.amazon.ca/dp/B015TKUPIC?...roduct_details
#278
Intermediate
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I measured the resting voltage 4 days after my 40 A-h nanny charge to the battery - its at 11.99 Volts.
I'm thinking I will let the battery die again and then haul the car to Lexus dealer and ask for a replacement battery. And ask for the vigorous document, of course. If that's the game Lexus would like to play, so be it.
I'm thinking I will let the battery die again and then haul the car to Lexus dealer and ask for a replacement battery. And ask for the vigorous document, of course. If that's the game Lexus would like to play, so be it.
#279
Instructor
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I measured the resting voltage 4 days after my 40 A-h nanny charge to the battery - its at 11.99 Volts.
I'm thinking I will let the battery die again and then haul the car to Lexus dealer and ask for a replacement battery. And ask for the vigorous document, of course. If that's the game Lexus would like to play, so be it.
I'm thinking I will let the battery die again and then haul the car to Lexus dealer and ask for a replacement battery. And ask for the vigorous document, of course. If that's the game Lexus would like to play, so be it.
#280
Intermediate
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No, not sitting for 4 days - driven 45 miles during those 4 days
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pcm888usa (04-19-24)
#281
Instructor
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Ok so charging some and comes down that low after 4 days. Sounds like excessive drain or software needs to change charging parameters. But to give you an example my 2020 ES300h measured yesterday at 12.22 and today at 12.2 so very little drop. Did a full charge 10 days ago. My drastic drop in drain happened when the trial subscriptions ran out so the constant transmission from DCM is the problem.
#282
Intermediate
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I don't know if its excessive drain - I have turned off all the "Car-alerts" paraphernalia that SMartin in the other thread advised, including digital key. Unless there is a hardware/DCM that is bad, I'm not suspecting those car alerts to be causing the problem (since SMartin claimed he measured the current draw before and after he turned off these app/car settings, which led to a ~300 mA quiescent current draw to 28 mA for him, I believe).
So yes, it could be hardware module that is rogue - or it could very well be exactly what happened to SMartin - because of Lexus' idiotic 12 V charging design, the 12 V battery degraded to the point where it needs replacement because it won't hold charge.
(I'm almost wishing this had started earlier in my ownership, like 1st week, for me as well - so that I could've triggered a Lemon Law return like others are planning - Lexus will only pay attention when it hits the pocket book, hard. Or a lot of talk about it in the press, consumer reports, JD power etc. If it doesn't cost Lexus money and business, they won't care)
So yes, it could be hardware module that is rogue - or it could very well be exactly what happened to SMartin - because of Lexus' idiotic 12 V charging design, the 12 V battery degraded to the point where it needs replacement because it won't hold charge.
(I'm almost wishing this had started earlier in my ownership, like 1st week, for me as well - so that I could've triggered a Lemon Law return like others are planning - Lexus will only pay attention when it hits the pocket book, hard. Or a lot of talk about it in the press, consumer reports, JD power etc. If it doesn't cost Lexus money and business, they won't care)
#283
![Default](https://www.clublexus.com/forums/images/icons/icon1.gif)
I don't know if its excessive drain - I have turned off all the "Car-alerts" paraphernalia that SMartin in the other thread advised, including digital key. Unless there is a hardware/DCM that is bad, I'm not suspecting those car alerts to be causing the problem (since SMartin claimed he measured the current draw before and after he turned off these app/car settings, which led to a ~300 mA quiescent current draw to 28 mA for him, I believe).
So yes, it could be hardware module that is rogue - or it could very well be exactly what happened to SMartin - because of Lexus' idiotic 12 V charging design, the 12 V battery degraded to the point where it needs replacement because it won't hold charge.
(I'm almost wishing this had started earlier in my ownership, like 1st week, for me as well - so that I could've triggered a Lemon Law return like others are planning - Lexus will only pay attention when it hits the pocket book, hard. Or a lot of talk about it in the press, consumer reports, JD power etc. If it doesn't cost Lexus money and business, they won't care)
So yes, it could be hardware module that is rogue - or it could very well be exactly what happened to SMartin - because of Lexus' idiotic 12 V charging design, the 12 V battery degraded to the point where it needs replacement because it won't hold charge.
(I'm almost wishing this had started earlier in my ownership, like 1st week, for me as well - so that I could've triggered a Lemon Law return like others are planning - Lexus will only pay attention when it hits the pocket book, hard. Or a lot of talk about it in the press, consumer reports, JD power etc. If it doesn't cost Lexus money and business, they won't care)
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wrinkle (04-18-24)
#284
Instructor
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Lemon Law in California does not have time limit. If the same problem occurred 4 or more times or the vehicle spent over 30 days in the shop, Lemon law kicks. I registered complaint with Lexus ahead of time because my car was less than 1 month old when the problem occurs. I am hoping Lexus could honor a buy back as good faith. Is not, Lemon Law meter is running.
#285
Intermediate
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Lemon Law in California does not have time limit. If the same problem occurred 4 or more times or the vehicle spent over 30 days in the shop, Lemon law kicks. I registered complaint with Lexus ahead of time because my car was less than 1 month old when the problem occurs. I am hoping Lexus could honor a buy back as good faith. Is not, Lemon Law meter is running.