"Lexus was called and are AWARE of the problem on several vehicles and it may be a computer part randomly turning on thus causing the battery to drain. Lexus said they wont have a fix for several months."

How do they know they will have a fix if they don't know what the problem is?

That's not acceptable to me.

Here is another way to file a complaint.


http://www.nhtsa.gov/Vehicle+Safety/Recalls+&+Defects





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This is kind of like the fox guarding the hen house. If it were my car I would be in touch with a law firm that works on contingency and gets paid by the vehicle manufacturer if successful, and gets no money if they lose the case. Either way, you don't pay anything.

It's in Lexus' interest not to proceed and lose a lemon law case involving their product due to there being other owners with this issue. I would not accept "several months" and hooking up a battery tender each night - a real PITA. Sounds to me that they're handing you a load of BS and hoping you'll accept it...

 

I have a '14 es350 with 11k miles with the same problem. Two weeks ago I woke up to a dead battery. Jumped it, went to the Lexus dealer and battery tests fine. Wrote off as door left ajar, etc..

Today, same drill, so it was just tested for parasitic draw, and all ok there. They are looking deeper at the battery for a bad cell, etc.. Will post results.

 

Perhaps it's your phone that is draining the battery.

https://www.clublexus.com/forums/ls4...b-battery.html

It's conceivable that if a cell phone can interfere with the key fob and drain the battery, then a cell phone can interfere on the other end and drain the car. The cell phone probably has much better range than the key fob, so it may be triggering things from your bedroom to your garage (since you stated they were next to each other).

Try locating your cell phone as far away and see if the battery drains.

 

I wonder if they put a bunch of GS batteries in the ES. They've been seeing this for a couple years. My ES now sits in the garage for, what can be a couple weeks at a time. I've seen no issue, as of yet.

 

Could be the Lexus battery supplier with a poor QC.

 

Your cell phone only communicates with your car, via Bluetooth. When the car is off, so is Bluetooth.

 

Yes, but the key fob does not work on bluetooth. So if a cell phone can drain the battery on a key fob, it can also interfere with the same signal on the other end.

 

Quick follow up - dealer believes it could be a bad ECU. Dealer is opening ticket with corporate in CA and will get a replacement part in to swap. Problem is that replacement parts for such a new car are scarce as they are used for New production.

this should be fun, will keep you posted.

 

Sorry, not buying it.

 

I have a theory that the problem is being caused by stray radio signals not coming from the Lexus keys. These stray signals may be present near the Lexus owners home but not at the dealers shop thus they cant duplicate the problem. The 434mhz frequency used by Lexus and other cars is also used by lots of radios and household equipment. Im not an electrical engineer but a Google search of 434mhz interference brought up this link which is quite interesting. http://www.doityourself.com/forum/co...ce-causes.html

 

thanks I just filed a complaint.

 

a lot of 3IS owners are having the same problem. they don't know what's going on either

https://www.clublexus.com/forums/is-...d-threads.html

 

Been reading about this... The Toyota/Lexus smart key system operates on the 315 Mhz frequency band. That band is used for RFID devices. Technically, the smart key is an active RFID device.

The system uses encryption to prevent spoofing. Whenever the car detects a signal on the right frequency, the car computer performs the encryption algorithm to validate that the signal is from the authorized key fob... It looks like any signal on the right frequency will make the car wake up and spend some energy to attempt the validation algorithm.

Here's the interesting part -- Lots of devices use that same 315 mhz frequency, not just smart keys. Some of the other devices include garage door openers, wireless security alarm systems, and various wireless computing devices.

Just a hunch -- try parking ten yards away from the house... If that avoids the problem, then look around the garage for wireless devices that might be the source of the interference.

 

hmm maybe its maybe my garage door opener.