Russell Wheeler

To know if this is the problem, just get the passenger to lower their window using their switch. If it works, then you need to do the reset procedure.

Mine had the same for about 4 years until it failed. On an old car, I wouldn't bother changing anything until you have to

No, mine never goes lower than 2. The engine cuts in if it gets to 2

Technically you could be done sleeping in your camper van under this law. However if the keys were not in the ignition, the curtains closed, and you were in the sleeping area, it's clear there is no intent to drive.

I agree, I have a 2006 rx400 and only use it for longer runs a couple of times a month. Ended up putting on a disconnect switch on the battery so it doesn't drain when left.

That's what I have done, a couple of small holes, therefore if water does get it, it has a way out.

Yes, make sure the air con is working, as it uses the cabin air to cool the batteries, as you have spotted the vents are below the back seats. Mines been in the family since 2009, and has 144k on the clock. It had been main dealer serviced until was bequeathed it in 2020. Main dealers had charged £2.5k for reconditioned brake calipers in 2019, and they hadn't even swapped the flexy pipes. 12v battery is a pain also if you don't use it often. Being so small it discharges quickly.

Loads of topics on here about water ingress. Basically the 400h leaks like a sieve from the back end and causes the problems you have. Drying everything out "should" sort things. Mines the same age so wondering what life is left in the battery pack, and what errors it will show when it starts to fail. Spark plugs are supposed to be done every 60k, but it's such a PITA of a job they are often missed.

Looks good, the power tailgate is problem. I have just given up on mine and manually close it. At the age it is, check for water leaks, there is plenty of information on here and if water gets under the battery pack, it can kill the car.

Just drilled the holes then squirted some zinc primer on, seems fine. No change in noise either -I didn't drill massive holes.Behind the back wheels

On the earler ones, 2005-9 they have a tiny starter battery under the bonnet. I only use my car a couple of times a month and have to disconnect the battery, otherwise it would be flat everytime. Its a PITA

Loads of places it can be coming in from. Rear seams, rear light clusters, just below the back bumper, roof rails. Basically these cars are like a sieve as they age. I have sorted most of mine out (they hide water well under the boot so you can't see it), then drilled a couple of holes in the boot, so if water does get in, it can get out without getting to the HV battery.

12v battery, or water ingress - its a 2008 RX400h (ie seive)

£276 for my 2006 RX400h with 1st Central

Never heard of leaks, like they have never heard of the small starter battery causing a problem in a RX400h. Liars. They do leak especially as they get older, seals drying out, poor welds.