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Yeah, agreed.  For previous cars I've bought old seatbelt buckle keys from junk/scrap yards (the flat metal bit that clips into the seatbelt buckle).  However, not a single one in my collection fits in the ES350, so I used the OBD scanner to disable the ding. 

In my case, nothing that I could do myself was helping for nearly 18 months (2 winters).  I changed batteries twice, jump start many times in cold weather as well as during summer.  I was very frustrated because even the dealer would not tell me how long it would take to find the source of drain but at bare minimum they would try for at least 2 hours @ 303/hour for a total of $606.  My local mechanic refused to start the work because he said it takes long time with unpredictable results to find a drain.  I think the dealer probably could find it quicker but they still wanted minimum 2 hour charge. Somehow I got lucky.  I went to another Lexus dealer with my wife for an oil change on her car.  And I asked the service tech about parasitic drain and indicated that I am willing to bring my car to work on the issue.  But, first I want to know what is the most common reason for parasitic drain in Lexus and how much money I am looking at for that most common reason to fix so I am well prepared.  He asked what year/model; I told him LS 430-2005.  He said oh, many 05 LS 430 had amplifier causing the parasitic drain.  And, if that is what he finds, it could cost anywhere upwards of $1300 to replace it in addition to 2 hour charge looking for the drain. So, I came home, watched YouTube to find out where the amplifier is in the trunk, removed the black cover and just unplugged the amplifier wire connector thinking that if this works, I could live without radio in this old car which I don’t listen to anyway.  It was in the middle of winter with battery dying almost every 1-2 days.  I kept my fingers crossed and started the car 2 days later and by good luck it started at first turn of the key.  I waited 2 more days without driving so the car sat in the driveway for 4 days and started again on 5th day.  Problem solved.  Now I use my cell phone to listen to music and news.  Navigation, and car phone audio still work on blue tooth.  The only thing that does not work is radio and CD player.  I would say just my good luck that I tactfully asked that question to the service tech otherwise everybody said "it could be anything, can't tell without starting the job".  

I have a 99 here, I was able too locate the black hose and drain it on the passenger side but I was not able too find one on the drivers side, I know this is 5 years old but there is hope, thank you!

Hi Tom. The invoice has partnumber PT219-GEN08-23. Invoice date is 5 April 2024. Attached is a screenie of the line item on the invoice.  I asked for a discount and got a miserly $10.94 off the $210 list. The government of course required its pound of flesh and that pushed to nett price to $215.48. Also attached are snaps of the software nav/map update versions. Hope this helps.    

Do you know the date of the actual map upgrade? I've heard that Lexus stopped updating the maps in 2019 or 2020. What was the part number? What is version number that shows in the nav. The version in me 2016 ES 300H is V15A8880. thanks