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Hi everyone,

I purchased a 2017 RX450h and am absolutely impressed by the quality of the vehicle and love the driving experience. However, only three weeks after purchase with around 375 miles on the odometer, I parked it in my garage for five days and when I tried to start it up it was 100% dead. Needless to say, the doors automatically unlocked, and the gas door flipped open sometime during the five days the vehicle sat in the garage so there seems to be a fail over built-in when the battery is ready die.

So I have two questions that I'm hoping the community might be able to answer. First, has anyone experienced battery drain with a brand new Lexus RX; secondly, is there any way to diagnose *why* the battery drained from information stored in the on board computer?

Thanks for taking the time to read my post, glad to be part of the owner's club.

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Hi Ben...welcome to the Forum

Although I do not have first hand experience with a discharging RX450h I am amazed that it has gone faulty as it is so new unless of course there is an assembly fault which is leading to the battery discharge.

Alternatively, is there any likelihood that an interior light (due to partially closed door/trunk) or similar was left on and this led to the discharge?

Equally, a battery of good quality manufacture should recover unless it has completely 100% discharged which would then have to be down to something discharging it.

Easiest way is for the engine battery to be disconnected and an amps reading taken to discover how much it is drawing and then a case of isolating different circuits to establish the cause.

Good luck with finding the cause and keep us update on the result

Cheers  Trevor

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Welcome Ben

You are not alone with this uses parasitic battery drain!  Welcome aboard from my experience this is an ongoing issue with Lexus and to be honest the dealerships and Lexus customer care don't give a rats !Removed! about you and this issue's.

The remedy for the problem they told me to drive your car more often or purchase a battery maintenance charger and plug your car in, excuse me when you buy a vehicle you expect it to start every time you get into it and not have to worry if it will start.

I own a 2010 RX 350 with 50,000Km! and yes the car is parked in the garage for weeks on ends also my other vehicle which I have not experienced any issue with that one.   My first Lexus and my last! this issue has been on going from day, one sorry to be a bearer of bad news.

PS  if the Service department tells you did you leave your lights on or door ajar or anything to cause a battery drain :bangin:JUST WALK AWAY.

 

 

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Ben W

Have you gotten anywhere with your mystery battery drain ?

I've had a 03, 06, 10 and now a 16 RX and have not

experienced this issue like Taffy13 has.

I have had this problem with another vehicle so I was looking for an update on your problem.

 Zman

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@zmanou812,

I haven't let the vehicle go more than a few days without it being driven so I've been fortunate that the battery draining issue only occurred once in the three months since my purchase. Since I live in cold climate area of the US where temperatures in Dec-Feb drop well below zero it's quite possible that's a contributing factor to the battery drain issue. That being said, I'm apprehensive about letting it sit around for more than a few days and I'm not confident it won't happen again.

Regarding what Taffy13 mentioned in their "Post Script". I did take go to the the dealer and the indeed they indeed asked me if I left any interior lights or if the doors or back hatch were ajar (for the record, everything was locked up and nothing was left on). Furthermore, they also stated that this *never* happened before―then proceeded to tell me that *most* Lexus owners drive their cars everyday. I was a bit insulted that they weren't more honest, but they're a car dealership (i.e., the epitome of dishonesty with the exception of politicians) after all, so it wasn't a big surprise that Taffy13's predication was my reality.

If I do run into this issue again, I'll be sure to post again.

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Ben

I too live in a cold climate and there are too many governing factors that could result in a dead battery so most just replace them to a larger newer battery

and move on. I wanted to figure out what was the cause, weak battery or was there a drain on the system from something.

I charged the battery and then put a amp meter on between the ground wire and the battery to see if there was a drain and there was.

I didn't know what was acceptable so I just hunted for the largest one.

I then started pulling fuses one by one until the drain of almost two amps changed and when I pulled the 12v outlet fuse the drain dropped to under a 1/2 amp.

I remembered plugging in an adaptor that converted cig plug to usb outlet !! so when i unplugged it the 1.5amp drain was gone.

Who knew an adaptor that went from 12v to 5v drew any never mind so much power, even when not being used.

Most people don't want to put in the effort to track it down but

you can do the same test to try and isolate the drain or get a battery maintainer or drive it more. :)

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There is a service bulletin from Lexus on how to care for your hybrid vehicle battery to prevent it from discharging. If I find it, I will post it on here. 

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