ColinBarber

No it doesn't unfortunately. It shares its system with the IS, which obviously doesn't do it either. It been discussed on here a few times over the years. Your dealer should have known this.

Clarkson has said pretty good things about the GS450h on Top Gear, and certainly liked the GS F when it was tested on The Grand Tour.

That's a bit OTT. The GS has never sold in high numbers, in any of the four generations. Lexus have remained around 0.5% market share of the UK for years - they aren't going for volume sales. You keep complaining that Lexus don't offer many engine options - that is through market forces - the GS250, IS250, IS200T never sold in numbers to keep them around. The ES is actually quite nice. If that comes to the UK it will be the next generation which will be an improvement again. Audi do okay without RWD. You need to remember that you aren't Lexus' target market.

My dad had three punctures in one day once! One on the way to work, got that repaired at lunch time, and then two on the way home. Having used the repaired wheel for the second puncture he had to walk 2 miles home when he got the third. Before that day he hadn't had one for many years.

Yes the sill light should be under warranty. The battery would probably need to fail a load test before that is considered faulty and from what you have said it will probably pass. See how the battery holds up overnight when you haven't been using the vehicle without the engine running.

You probably shouldn't spend more than 30 mins. without the engine running - Lead acid batteries don't like being heavily discharged so you just weaken the battery by doing so. In theory you should be able to get a few hours before you flatten the battery so your one either wasn't fully charged or isn't as strong as it once was.

You would have the remote touch controller (mouse like interface). The rotary controller operates the standard Nav system.

I'd disagree. I would say the Gen 3 wasn't competitive but the current Gen 4 was a very good vehicle - although being 6 years old is a little dated now. (you seem to be a generation out, the GS450h was never available as a gen 2). Sadly it has never sold well and the rumours of its discontinuation have been circulating for some time now. There is the possibility that it will be discontinued world word once the current generation lifecycle comes to an end.

Ok you have me confused here. We are not talking about DCC or DAT, standard cassette is analogue. The tape adapter converts the electric analogue audio to magnetic field and the player reverses that. There is no digital compression/decompression. You can have a form of dynamic range compression with Dolby noise reduction, but that really isn't what is being discussed and those adapters don't support that - Dolby NR should be turned off on the player.

There is an transmission oil cooler, housed within the bottom of the radiator. There have been several instances where the pipe coming from the cooler separates from the body allowing coolant and fluid to mix. When the engine is running the pressure from the transmission is greater than pressure in the cooling system and the fluid will go from the transmission into the coolant - which will overflow. This isn't too bad but once the engine is turned off there is the possibility for coolant to get back into the transmission. So you have a choice, spend £100 every 10 years on a new rad or run the risk of needing a new £3,000 transmission. This design is common on nearly all Toyota vehicles with an automatic transmission, however the LS430 seems to suffer more than most. Possibly vibration, tension on the pipes or something else, but either the welding gives way or corrosion sets in.

It has the same setup with an oil cooler within the radiator so certainly wouldn't hurt to replace it.

It will use the latest Toyota hybrid system combined with a new engine that is 41% thermally efficient - I'll be disappointed if it doesn't match the IS300h

I think you are over estimating how much energy is recovered during braking. Each full energy square that comes up on the 15 minute consumption screen represents 30 Wh. Under long controlled braking, where you make sure only reg braking is used by not allowing the power meter to go off the scale and therefore not engaging the mechanical brakes, you may get three full square if you are lucky, which is 90 Wh. The IS300h battery capacity is just under 1500 Wh, so you have charged the battery 6%. Even if we accept that really little more than 50% of the true battery capacity is available for use (the in-build redundancy makes the Toyota system ultra reliable) you have still only achieved around 10% recharge - the rest is coming from the petrol engine, through sustained re-charging, whether the battery indicator shows this or not. The next gen Toyota hybrid system, used in the current Prius and which will be used in the new Lexus UX, is a big step on. The batteries are able to be recharged at a higher rate, allowing for better regen, the inverter and transmission are more efficient, and electric only modes can operate at much higher road speeds. Even with this system you see a drop in mpg at motorway speeds compared to free flowing urban driving.

I believe there is a dedicated fuse, labelled OBD on the LS.

6.9s is the 0-62 mph time so you are a couple of tenths slower

Yes they have sensor valves. You would need four of them.

No codes. The ECU will reset in 30 seconds, you don't need to disconnect for 10 mins.

Yep, I never really had any issue with the IS lights. Original fit Xenon lights are bright and focused, which is why all cars that have then need self levelling and washers to avoid dazzling oncoming drivers.

It is an ambient light sensor to control the instrument cluster lighting.

Both the same, it is just that the 300h uses the electric motor for regenarative brakes so the mechanical ones only get engaged if you need more stopping power than the motor can provide on its own. If you don't brake heavily the rear pads hardly get used and corrosion can set in.

Fault codes are normally obtained through the OBD-II port using a code reader or computer.

I think they are LED, hence no bulb to replace. I'd first look at the wiring to the light cluster to make sure it hasn't been tampered with (e.g. from someone trying to fit a towbar).

You need to do some heavy braking every now and then, the rear mechanical brakes hardly get used if you are light on the brakes and let the hybrid system do most of the stopping.

I think that would only be for a major accident.