This Code just poped up anybody can explain what this Code B1596 is about.

Thanks in Advance Taffy, 

You all have a fantastic weekend.

Check your Headlight relay .

If your RX350 is running fine  with no problems! my advice is No save your $$$$ in your own pocket and not the Dealer have a good  day.

Good Morning Gary My advice to you is go out and purchase a Garmin Gps that you can update or any Gps for far less than what the Lexus dealer will charge you an update!

Also there update are not current I believe the updates are about 2 years behind. good luck. 

I had the same problem for years battery going dead Dealer told me I did not drive my Rx 350 long enough and suggested installing a battery maintenance charger and plug it in every night. I did not agree with that BS.  after doing a lot of research on parasitic draw and checking the draw on my RX 350 and found nothing really to suggest there was a problem.     My suggestion Replace your battery with AGM  battery then your problem is solved that's the battery I installed and have had no problem since good Luck. 

 I had the same problem for years with my 2010 Rx350 Lexus replace three battery's under warranty and problem still persisted!  Lexus service told me I did not drive the RX enough to keep the battery charged, I would have to boost the car every four or five days. Finally after doing a lot of research on battery's I bought an (AGM Energizer Battery) problem Solved no more dead battery. So if anyone is having problems with a dead battery get that TOYOTA battery out of your vehicle . 

If you have a roof rack rails on that will create wind noise

Good morning Mike03,I agree remove Negative battery Terminal and leave off for a couple of hours then reconnect this will reset your system to factory default then every thing should work fine once again. and yes you will have to reset every thing. Good luck

Airi2010  if you are mechanically inclined I would take †he plugs out and check †hem. Mind you the back three plugs are very tricky †o get out but you will be able to do it wth the right tools.

It’s possible you also may have leaky Injectors I would recommend some fuel injectors cleaner. 

I use Amsoil PI Additive 355mL  every  couple of tank full or when I go on a long trip before I would do anything, I would try this way first.

By the way i burn regular gas in my 2010 Rx 350 never have used premium as recommended by Lexus.

If you go to a dealer they will recommend fuel system flush and a tune up which could end up being very expensive.

Are you the original owner Of this vehicle ?

According to Lexus schedule maintenance replace spark plug (192,000Km) 

I live in Northern Alberta Canada  and I own a 2010 RX350 I average between 9.5 to 10 liters per 100km on the highway around the city it varies..

You may need a tune up depending on the Km on your car also check your Air filter.   

The first thing I would do is check to see if you have an Air Lock in the cooling system try and purge the system..

Forget the second mechanic advice if the coolant was coming out of the exhaust system you would smell a sweet smell also  lots of White smoke..

Good luck 

My guess and 100% sure it a broken wire at the door hinge check the wiring going into the door open the harness up and check for broken wires good luck.

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 JUST WALK AWAY.

I drive a 2010 RX and when the warning light comes on indicating low fuel I can drive roughly 100 miles on empty.

Lexus1213

If you are having any doubts about this car I say twist and shout and walk away! you will not be happy with this car. Just my 2cents.

I would get the Valves clearance  check and  adjust that's my opinion.  

I received a recall letter from Lexus and they changed the oil cooler hose to a steal line at no charge,

Dales121 if any damage occurred due to the hose leaking  keep after them to fix the darn issue,

Recall Details

Transport Canada Recall # 2014043

Recall Date	2014/02/12
Notification Type	Safety Mfr
System	Brakes
Manufacturer Recall Number	SSC228, SSC229
Units Affected	25,557
Category	Car, Light Truck & Van, SUV
Recall Details
On certain vehicles, a manufacturing defect could affect the functioning of the electric brake actuator, illuminating various warning lights in the instrument panel of the vehicle and disabling the antilock braking system (ABS), traction control and vehicle stability control systems. This could increase the risk of a crash causing injury and/or property damage. Correction: Dealers will update the vehicle stability control ECU software and affect repairs as necessary.

Make	Model	Model Year(s) Affected
LEXUS	RX 350	2012 2013

Have your rotors machined or replace sounds like they are out of round also check your brake pads. good luck

I would check the rear wheel hub bearings also check the tires.

Possibility It could be the head gasket starting to leak antifreeze into the cylinders or a cracked head, check your antifreeze level.

As far as the rattle underneath could be a loose exhaust shroud

Hopefully Lexus have found a fix for parasitic draw on the battery and not fixing the problem with a trickle charger on a $70.000+ Vehicle... The problem that I have I can't park my rx350 at the airport or in my garage no longer than one week with out the battery going dead and needing a boost to start...

Take it back to your dealer and have them fix the problem, your Vehicle is still under warranty.

Reply to Dsvetcov

I also Had Dunlops Tires on my 2010 rx 350 with 40000 Km. I will say those where the worst tires I've had had in my 40 years of driving now I purchased Michelin latitude tour P235/55/19 and so far so good.

Also in regards to your comment: Still RX 350 is the best on the road and will hold their value.

I went into my local Lexus that week to see they new 2016 a salesman approached me and asked me if I wanted to trade off my Rx 350 and the would give me top dollar for my :whistles:....

After viewing and test driving my 350 with no accident or any damage and as the dealership would say in showroom condition, after crushing some # with his Sales manger came back and offered $20,000.00 Canadian Dollars for his 2016 @ $76,000.00 that's a $46,000.00 Loss in 4 years I purchased my RX at the end of 2010, so Dsvetcov I have to disagree with your statement :chairshot:

Jeff since you don't have Navigation try this push your main menu button and select voice and scroll down to select voice guidance speakers and set on driver position and enter save see if it works better for you. good luck

and for those that do have Navigation system owners Manual go to page 347 under voice setting select voice guidance speakers and set to driver position and enter save.