hughseh

30 minutes ago, Ridgeback said:

I bought this item number 393691189056 from Ebay

I was a bit dubious with an aftermarket part, but it fitted and worked a treat.

I dread to think what the OEM price is.

Takes about 30 mins to fit.

Remove the back panel, there a 4 x 10mm nuts holding the lock assembly/number plate light unit, you can get to them quite easily through the gaps in the rear door

Many thanks, will try this

On 1/29/2024 at 5:27 PM, Ridgeback said:

Thanks for the prompt reply.

I'll check it out in the morning, and see if this is the issue.

Best regards

Hi mate, did you resolve this? I'm having the same issue, the boot won't open only when using the manual button. The key fob and interior button work fine 

Just back from France, too, in the 400H. On the main roads, limited to 80 kph / 50mph, MPG is amazing, 38-39. On the equivalent of a by-pass, still 32-33 mpg at 110kph / 70 mph. At 130kph / 80mph, MPG falls off drastically, 26-27mpg. 

French roads are miles better than UK, depressingly. Driving standards are much higher and so traffic flows better, no lane hogs, overtake or stay in the inside lane. 

On 7/22/2023 at 11:31 AM, katabrontes said:

I think you can close the sunroof with a mechanical crank via a hex socket on the gearbox.  As I recall the key is clipped under the cover plate for the mechanism

Hi, would you mind adding some more detail on this as I have a similar fault and just need the roof shut manually.

1. The gearbox to the sunroof? Where is that exactly?

2. what key and what does this do?

Thanks 

Spoke too soon, just discovered a leak from the radiator this evening (discovered trying to blow hot air onto the cabin floor)

Can't see coolant in the reservoir at all. just hope no permanent damage caused and explains why my fan is always on 

A successful update in case it may benefit someone in future. 

I've solved all the electrical problems aside from the hybrid warning in one hit. I don't know how exactly, but I had the car in ready mode and was prodding with the glovebox fuses just now, pulling out the ECU 7.5amp fuse (no.63), then the one next to it. As I reinserted what I think was no.63, it seemed to reset something and I hear lots of pings, etc and look over to see the dash indicator saying the passenger door is open. I've never had that before. Long story short, it's now restored 

Cruise control

Power tailgate (boot) 

Side mirrors adjustment and folding

Dashboard indicator now tells when the lights are on

Vsc warning light has gone 

The only still not working is the sunroof.

I have the carpets up in front of the front seats for a few days, drying out. I suspect there must have been some mositure on the fuse or in the system somewhere, that by reinserting the fuse whilst the car was in a ready state has caused a sudden surge that perhaps burnt off some residual mositure or corrosion (I couldn't see any anywhere). That could be bollocks of course. 

Now to strip the rear seats out again and get to the hybrid Battery and relay for some repairs with contact cleaner, lol.

Secondary is to fix the multiple leak points, but the good weather recently is giving some breathing space 

Try here

https://www.startmycar.com/gb/lexus/rx-400h/info/manuals/2007

A quick question for those that have used silicone to seal the roof rails, does that mean once sealed, they won't be removed ever? Ditto any other parts that are siliconed e.g. the rear lights? Also, where is the exact point of ingress, is it the bolt holes or somewhere else that lets in the water?

1 hour ago, Bluemarlin said:

Have you checked to see if there actually has been water ingress to the hybrid battery? It's not uncommon if your sunroof drains have been blocked, or water has got in via a number of areas that can leak.

If you have had a leak and water has got to the wiring, it's quite possible that wires could be corroded even though you can't see the extent of it. The water can wick up the wires and corrode inside the insulation, I've seen corrosion several feet inside the insulation on boat wiring.

Here's a couple of videos on leaks in the RX 400h that you might find helpful:

 

Hi, yes, I stripped the carpets the weekend just gone and they were pretty saturated throughout, mainly on the driver's side. Have inspected the sun roof drain on the driver's side with a endoscope and all clear

Tested the door cards and a slight drip that I'll get around to.

I also got to the hybrid Battery but didn't remove the covers - the relay, from what I could see had slight corrosion but I've seen photos of much worse. I managed to reach underneath to clear the drain plug, which was blocked.

I've also looked at the various electrical connections behind the glovebox and under the driver's steering wheel panel and no obvious signs of rust / corrosion.

One final point, there is a cut cable on the passenger side underneath the sill trim. I can't see what it would connect to (the cill light is fine). Any ideas, it's a very thin wire, so surely not to do with the hybrid fault 

Just wanting to bump this thread as it seems to be a very specific set of issues that I'm also experiencing. It's not a random set of issues, but always the same set, namely

Tailgate won't work from fob or button on dash

Sunroof won't work at all

Side mirrors won't operate at all

Memory seats not working

Electric windows only work from the window you're operating (i.e. the drivers side control can only operate its own windows).

Noting the responses above, it seems to be corroded wiring behind the dash or I've read elsewhere corrosion to the ECU, but have pulled off the lower dash to both sides, I could not locate any corrosion to connections in the slightest.

I do have the P0AA6 code (water ingress to hybrid battery), but it seems unrelated to that given others experience 

Edit: just read another post where someone cleared the same issue by changing his brake pads, which were worn.

My full list of fault codes

P0AA6

U0146

C1259

C1310

B1214