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Hi everyone. I have a Gen 1 GS300 and I'm having some issues with it. I put a post up previously about my car starting, running for a couple seconds and then cutting out. Also all the interior lights and gauges have stopped working. Initially the issue was that the alternator was not charging the battery and so it died. I have since had the alternator changed, unfortunately the 'genius' AA sent out to help me get the car home shorted out the battery. (Put positive terminal to negative) I'm completely lost as to what the issue is, the alternator has been changed, the car starts fine so I don't think it is the battery. I have changed the interior fuses for the 'Gauge' and 'Panel'. None of the electrics are working at all, sunroof, windows, steering wheel. Nothing. But the exterior lights do work. Also I noticed if I keep the key in the car for a few minutes it will refuse to start at all, take the key out, put it back in and starts no problem, but then cuts out again. I am reluctant to take it back to the garage because I just don't trust them anymore. Has anyone else experienced this before? I am really stressed out about this. Any help is greatly appreciated. Thanks Aamir

Hi everyone. I am having an issue with my 1997 gen 1 GS300 Sport where the engine starts but immediately cuts out. It died on me right after getting my mot done. I was advised by the AA that it was my alternator that was not charging the battery. So I got the alternator replaced, put the battery on charge until it was full. Put the battery in but now the dash is not working at all, and the car immediately cuts out. When it died the first time it wouldn't even start, now it starts no problem but only runs for a couple seconds. I'm at a bit of a loss here as to what it could be. A new battery maybe? I'm not very adept with the mechanical stuff so any help is much appreciated. Thanks Aamir

After I took the jack from the boot to raise the car to check into an O2 sensor problem I didn't close the lid completely. 7 hours later the battery was down to 6V, but it may have been low before. After recharging it I tested the current drain with everything off and the car unlocked. It was fluctuating between 0.83 and 0.87A, so something was varying the current. Using 0.85A every hour over a weekend would take its toll on this standard capacity two-year-old Toyota battery. After 4 days without driving I'd never been able to guarantee it'd start , either with the original or new battery. I never checked why as it seemed an inherent characteristic worldwide so I lived with it...but now I'm interested. Removing fuses one by one and only possibly finding what's happening isn't very appealing, so, did anyone come to a definitive solution?

Hello everyone, my first posting here , so hope I get the format right ! Yesterday , after several years of fault-free driving of my GS450h , the engine management light came on, but the car continued normally. I drove it for 30mins. Several hours later , it started ok , everything appeared normal ( apart from the said engine mgmnt light) ,Then I heard an odd noise from the boot, and the exclamation triangle came on with the associated "check hybrid system" warning message. On the Energy/Consumption middle main display- 3 blue bars were indicated, flow arrows were moving around the engine/battery/electric motor/axles as normal, apart from no directional arrows out of the battery .I pulled over. Nothing appeared untoward at the battery site, or the other control box areas in the boot. I continued for 20 mins. 3 bars became 4 - then 1 ..... panic ! then the dash lit up like a xmas tree ! - engine died on me . A road-side recovery guy put diagnostics on it and said "the battery is not keeping its charge -it must be the alternator " - This car , I believe doesn't have one ! ??? Many other faults came up -not surprising as hardly any juice in the battery....I have sent it to my local Lexus$$$$ dealer , any thoughts ?? new battery ?? Thanks for taking the time to read this.

My GS450h is an excellent car but I have one recurring problem. The boot comes open while its in the garage at home, leading to slow run down of the starter battery. The car is often in the garage for a week or so as its only used for longer journeys. Prime suspects are the keyfobs in my pocket and my wife’s handbag but our other car is rarely affected this way and the Lexus doors never seem to get unlocked this way. Could it be some strange wireless interference? There is only one other house within wireless range. i have removed the bulb from the boot courtesy light which has reduced the battery rundown if the boot comes open but the warning light on the dash still consumes some power. I have only recently discovered the luggage security button in the glove box which should prevent it happening again but putting stuff in the boot when going to the car is now a minor hassle! anybody else had this problem?

Hi everyone ...the radio power switch on my 2008 GS300 has stopped working. I can still use the knob to cotrol volume, but it will not turn off/on. The other buttons on the unit .. Disc/Aux/ FM/AM/Load/Eject etc have also ceased to work. However, I can still change audio input using the Mode button on the steering wheel. It was suggested on the US site ClubLexus, that disconnecting the battery for 30mins to let the system re-set itself may work, but I’m unsure what else disconnecting the battery will affect .... satnav/ECU/seat settings etc ... or something more important! Will this require a visit to local Lexus to put right? Has anyone else had the problem with the radio button? Suggestions / advice anyone? Thanks in advance ....

I've been driving my '18 IS300h for almost 3 months now and it's been an absolute pleasure so far. The only thing that bothers me is the noise level coming from the batteries' cooling fan next to the right hand side back seat. Usually this is not a problem for me though as I have the radio on most of the time, but if you have other people in the car it's quite embarrassing for a new car in this price range tbh. Of course it's not on all the time, but quite regularly though. Probably the dealer will say the noise level is normal, but I'm just curious about anybody else's experience on this? Wy does the fan need to cause a whistling sound? The HVAC blower fan doesn't whistle, so why does this cooling fan need to?

SC430 auto 2005: Advice re flat battery. I've had my beautiful car for nearly 6 yrs and it has been reliably unreliable during this period in not starting if I leave it for any period of time. During the winter I can drive 100 miles, park for a couple of hours, then it won't start without being jumped. In the summer I can sometimes leave it for a couple of days before it fails to start. Again I have to jump start it. Despite renewing the battery annually and making sure I turn EVERYTHING off, I now permanently carry a very heavy duty power pack in the boot to start up wherever I am. It's a joke. On one occasion I drove it for most of the day, stopped to concentrate on a hands free call for 20 minutes only to find I had to jump it to re-start. My local dealer has not been able to resolve and I really don't know where to turn to. I absolutely love my car but I no longer drive it in the winter, too much trouble in the rain to jump it, so it is garaged for at least six months. I've read that other owners have had the same or similar problems - if they've been resolved, how? Certainly doesn't look good for Lexus, my local fiends/neighbours can't understand it at all. Find it amazing that I haven't got rid by now!! We've tried a trickle charge but even that can't be relied upon on such a big engine. Any advice. I live in Hampshire.

Hi all, I have recently bought a Lexus IS300h F port and I was told to get a tracker fitted by one of my colleages. I have bought the tracker that was suggested to me but I have no idea where or how to fit it. The instruction manual says to attach it to a 12-36V charger (I'm assuming the 12V battery in the boot). I have never done anything of this sort before so I just wanted to ask a) is it safe for me to try and fit the two leads myself? b) would me attaching a tracker to the 12V battery drain it & cause problems?? Hope to hear from someone soon.. Shyamal Ps: the picture below shows the two leads that I'm supposed to connect to the battery if it makes sense to anyone

Hello peeps. So my replacement battery i had was a Toyota Optifit which tbh im not happy with. Been 18months and its struggling as the days get colder. I bought a Ctek charger which charged it and it was ok for a day and then when i measured it across the terminals i was only getting 11.8v Can someone who has the original factory fitted battery take a pic for me and if they can find out the spec and part number from the battery please? Cheers

Had to get a replacement battery in a hurry today for my 2003 IS 300 Sportcross, so went on-line. Eurocarparts website was easy to use and had a tasty discount offer. They had a choice of 2 so I selected the more expensive one with 70Ah, CCA 540A, rating and ordered it 'click and collect'. £67.40 inc vat and 3 year g'tee which I didn't think was bad. Now I've got it home I can see it doesn't fit the battery tray properly. The base area is too big to fit deep in the tray so it sits quite high. Also, the new battery is 10mm taller than my knackered battery. As a result, the standard battery clamp won't fit (the rods aren't long enough) and the terminals are worryingly close to the closed bonnet. Is this a common issue? Is there a work around or will I have to return it to eurocarparts? Is there a generally recommended/ easily available battery that fits? Thanks in advance for your replies!

Having a nightmare. Lexus IS 220d SE-I 1) Battery died 2) Replaced for new. COCKED UP, got the polarity wrong and fried the electrics. 3) Checked all fuses, replaced several micro fuses and the entire fusible link. CAR 90% works, fully drivable etc however, PROBLEM Windows - The on side (passenger) front and rear windows do not work from the doors themselves or the driver's master switch, completely dead. Also the red light at the bottom of the passenger front door isn't illuminated suggesting it might not be just the windows? The wing mirrors do work however (illuminate and fold in, separate circuit??). Climate Controls - A separate point, the climate controls are dead, the stereo is operable from the steering wheel and the clock displays, but the main unit above with heating, air con and stereo adjustment is dead. Any ideas?

Afternoon all I took delivery of my new NX three week's ago and so far I'm absolutely loving it! I just have one question for the community regrading the hybrid batteries and EV mode. Every time I start the car EV mode is unavailable until about 10mins into the journey. I understand they need to charge but I'm concerned the battery is not holding its charge as it should. Is this standard for a Lexus hybrid? It feels as though this has got progressively worse since I bought it but that could well be in my imagination. How does this compare to other people's experience of the NX 300h? Thanks

the battery in my 2012 IS200d is on it's way out (hydrometer is showing red after long drive) ... so will replace very soon. Any surprises I need to be aware of? (things like security codes, door locks etc, radio memory ?

Hello, I was wondering if anyone could help please. I have a LS600HL and the battery went completely dead. I charged it up this weekend and the charger says it is fully charged. Upon reconnecting the horn alarm went off, but I managed to stop it. I got into the car with manual key entry. The dashboard was going crazy. The interior lights are coming on and off. There were a few minutes of very weird activity. The situation now is: the battery in the boot is clicking on and off. I can't start the car. The horn is not sounding, but there is a groan/ creaking coming from under the bonnet, at a similar internal to the horn alarm. The main issue seems to be the battery not providing stable power, but clicking on and off every second. I've disconnected and all is now quiet. Does any one have any ideas please? Thanks, Rob

Hi all, Im in the process of buying(not sure) a LEXUS RX 450H SE car - 55k miles, 2010 - 3456 cc But the car wont start - Dashboard blacked out Im guessing its the battery but not sure I just want to gather your opinion on how much it will cost to fix assuming it has a dead hybrid battery ? And list of problems that could be wrong with the car from electrical point of view - Ill assume petrol engine is ok Many thanks

Drove to Luton Airport this morning. All fine. 3 hours later to go home, car unlocked, then dead. No lights, no ignition, nothing ... Called Lexus Assist ( AA). 30 minutes later, they arrived and the car has started. The problem? The connection to my battery had come loose(!), so it was effectively disconnected for maybe 3 hours. It took about a minute to be fixed. It's never let me down before, so I WAS surprised! I guess the car has to re-learn stuff now. Certainly some of memory settings have gone... But a happy ending. Top Tip: Keep a coat in your car. I had one ( a high viz ) and was I grateful!

Hi all, Just wanted to post a quick review regarding Hybrid battery conditioning. I think it was off this site I learned of Hybrid Battery Solutions based in Northampton who I contacted after getting a diagnostic from Lexus. The car lost it's initial surge of power from the battery and would always move off using petrol engine only. Battery indicator would drop to purple very quickly. MPG dropped from about 29/30 to 23-25mpg. I had a CHECK HYBRID SYSTEM message, but it was solid - not flashing check VSC etc as others have described. Lexus ran two separate diagnostics and said it was a smart battery ECU which needed replacing at a cost of £1250 + vat. They gave me a print out of the error code and when researching online it was more common that it was 'Battery pack seriously deteriorated'. I couldn't find much literature regarding the smart battery ECU other than a workbook note suggesting that this is replaced first then if this doesn't work, the battery pack should be replaced. Not knocking Lexus at all but I wasn't overly convinced or filled with confidence. My car is probably only worth £3000-4000 (ambitious?!) and has 150k miles so didn't want to pay for this smart battery unit and then a battery if it didn't work! Using my logic I thought it was more likely than not to be the battery - after all, all batteries do degrade and this seemed to be much much more common when looking online. I contacted Richard at Hybrid Battery Solutions in Northampton who gave some advice and we had a chat about hybrids generally - in fact, we didn't even discuss him 'selling' me his service until I asked (always a good sign I think!). Anyway, cutting to the chase I drove from Teesside to Northampton and averaged 26.2mpg. Left it with Richard for the week and I was astonished when I got it back. It felt like it had been remapped - it was better than before (probably cause I never had from brand new myself). On the same journey back (about 190 miles) I averaged 38mpg. Even after almost a week of short journeys, spirited driving (and traffic light drag racing again ) I am still on 33.4. I am almost gutted that I didn't go for the grid charger (which I think uses some kind of witchcraft to keep the battery cells in their best possible condition) but I might well need a bigger boot to fit a pushchair later on in the year so the car might go although with hindsight, this would have been a good selling point when selling the car. He can do this separate from conditioning I believe or both at same time. It has given me confidence to go and buy another higher mileage hybrid. There is a solution which is significantly cheaper than Lexus and urge others who were in my situation to have a look at this. Hopefully this isn't breaking any forum rules - it's just my experience of this company and that others find it informative.

Bought a 2003 IS200 and love it. I did have to change the battery and now only the indicator lights come on and it won't turn over. Dead. No other lights in or out and no flashing lights. Can anyone help?

Hi All, Just joined this forum as now the owner of a used 54 reg RX300. The dealer changed the battery just before I bought it and only the drivers window works from the console on the drivers door. The switches on the other doors work fine. I've read in the manual and on here about the procedure to reset this but on my car that's not working. I've tried most of the suggestions I've read except for keeping the buttons pressed for over 20 seconds. The green LED's are showing on all the switches and they go off when I press the windows disable button on the driver door master console. The function to open/close the windows with the key in the drivers door only works on that door. Is this something simple or am I into replacing ECU's and tracing wiring faults with this. The dealer did get a 2nd hand master switch assembly but that made no difference. How do they work? Is it messages via the CAN bus or are there individual wires back to the drivers master switches. Its not a deal breaker, the car is great otherwise, it would be good if this worked too. Thanks in advance for any wisdom on the matter. Ken

Hi I've just got a 'Low Key Battery' message on my dash cluster this morning. No biggie. The spare is till working. I've seen a lot of videos that demo how to change the battery but. Apparently I take out the physical backup key and use that to split open the fob. But ... no matter how much I twist and turn that key I cannot split open the fob. I'm worried about snapping off any part of the casing. Has anyone here tried this method? Does it require a fair bit of force?

Hi, Lexus main line dealer has checked the car under warranty and advises a new 12v battery is required. Quoted me £257 so I checked usual on-line providers, e.g. eurocarparts etc and quotes come back as £70-£90. The back to dealer and am advised that a 'Gel Cell' type battery is required with hybrids as could invalidate the warranty for the main batteries...Found what I think is a Gel battery (Elite TE030) for £92. Can anyone confirm or challenge this Gel Cell requirement? Feels a little underhand to me.. Thanks in advance for any advice.

Hi All I'm new to Le4xus and Hybrids I've had my 400H for a couple of weeks now and am just getting used to the hybrid system I find that even when the engine is up to temp and I'm pulling away it seems to start almost imediately even if I try to keep the power meter in the dashed area at the low end of the scale and not rely on electric power. I don't have any fault lights or weird sounds and the batery is always about 80% charged or less. My thoughts were that it would utilise more of the electric traction motors at low speed as the spec of them seems to indicate that there is sufficient power to pull a house down! Is this normal? Cheers Peter.

Went to use my GS450h after leaving in the garage for 2 weeks and it flashed up key not recognised , it started fine when holding the fob against the start button so assumed was the battery in the fob, I always have spare batteries so changed but this still the same and the same with the spare key so pretty sure not the key fobs or battery Called Lexus and they advise is most likely the car 12V battery is drained from two weeks idle and therefore not sending out signal to key - they advise a run will; charge it up and all will be fine My concern is central locking does not work from the fob -assume as fob not recognised ? and do not want to be miles from home with an issue - guess have no option but was wondering if anyone else had experienced the same ?

Hi, New IS200 owner here. Just a general question, regarding my cars battery. I notice on the dash of my car that the volt reading for my battery is just over 9 volts. The car sometimes requires me to push the gas pedal to start up. Is this because of the battery or maybe spark plugs?? Thanks in advance Jay