RX450HPrem

Philh3333, The part number you need it 68910-48023 its the latest part number for the rear PBD motor, if you do need one theirs a company in the UK that can supply them or buy from abroad much cheaper than Lexus dealer. If you are capable of swapping it out yourself quite an easy job

Philh333, I would suggest try this reset procedure, check around battery for water, you could drop rear of roof to see around PBD Motor for damp - hopefully your motor hasn't broke 😞

Here you go

Dave Unit is about 4kg - just weighed my old one !

Oh Gosh ! that's a shame seems like there is a pattern to these failures and the cost owners are paying the Lexus dealers to fix the issue seems excessive. I have found two places where we can get these motors for far cheaper cost Approx £600, and fitting is not that hard. At least yours is fixed now like many of us. 🙂

Richard was aware of the Boot access MOT requirement as had the same issue with an Old Jazz that a friend had. Anyway, what did Lexus do about the Back door fix ? How did they fix it ? Paul

Peter I think your right from about 2016 - RX450H Up to 2015 Motor in roof after that I think its motorised struts ? Ive been having a look as to replace the former roof motor is about £800 but struts are around £200-300. 😞 someone in Lexus must have had a brain wave !

John let us know if they fit and fix your issue Thanks Paul

None Taken Herbie, Are you saying the motor won't lift the Tail gate if there are not struts ? I was thinking it would take out a potential part of the problem with a little help from your hand and see if its a strut issue ? Paul

John , Your synopsis sounds about right, other option is to remove one at a time see if it manages to close normally - I think yours could be a strut issue rather than a motor issue. The amazon struts are an interesting replacement I'll wait to se if others comment on suitability but they seem to fit Paul

Thanks Herbie, I did wonder but thought it only gets hot in use, all the other time it just sits there - if it does get hot it might dry out the wet in the roof !!! lol

LOL Don't think you have ! had mine over 6 years and this is the only thing that's gone wrong. So its either you have been out and the battery has charged up again ? if it wasn't at first. but suspect of that. Or its aMoisture issue (which I feel mine was). And your trip out has dried up the moisture. Its quite an easy job to drop the rear headlining to have a look at the Motor ECU and check for any damp, if your so inclined. see pics of mine

Rob, In answer to your previous questions - I did in fact take my old unit to an electronics firm to have it checked out, the guys said it would cost about £110 per hour, two hours work and if the chips were programmed they would not be able to rep-program them. hence I went down the route of a second unit cheapest I could find. As for protection from Wet - my new electrical unit is wrapped in protective cling film and tape now and I will look at adding further water protection form above and round the new unit just to make sure 🙂 good luck Monday

Rob the part number you need it 68910-48023 its the latest part number Paul

Rob, welcome to the logical way this fault seems to manifest ! 😞 Only thing I can suggest is try dropping the roof to see if you can see any damage to the Motor ECU, I.e Water ingress ? You said your car was laid up for a couple of weeks ? Was it in a wet environment ? they do seem to be very fragile to any sort of change. Humidity or Battery. Update to all on my Issue. Ordered a new part from UAE cost approx £600 and was shipped really quickly, arrived and fitted all working now ! Phew !! what a mess It seems like if you have a RX450H 2010 model, this is an issue you will come across some time or later. I really cannot understand why these units seem to prone to a similar issues on the same car and same year and how we communicate this back to Lexus ?- As for the detail I still don't know which actual item failed to cause this issue - as you need to change out the whole unit to fix when I suspect half of the mechanicals and motor are fine. Thanks to all the people on here that helped in this and good advice was given to narrow down my fault. Paul

HI RXboii_786 Did you get to the bottom of this ? I also have a 2010 rx450h with no vehicle customisation ? Looking to reduce the Key access on mine to deter thieves Thanks

Thanks Colin I attend to agree with your comments not the battery but moisture issue Paul

Thanks Colin Seems really strange this issue, I know people maybe have a theory that it is affected by the aux battery. We did have a really cold spell here so any battery would lose a percentage of power due to low temps and snow on the roof for a few days maybe it leaked through and water damage has caused the issue. I wonder if any failures in hot countries ? And if a Lexus issue would be nice if you could buy just the board as its an easy replacement procedure. I rang a parts dept at a dealer and in their words 'they thought the replacement cost was extortionate ! 🙂 Note My Aux battery was good. If anyone has imported one successfully please let me know Thanks Paul

Hi Herbie, It seems there was a film of what I would call varnish or rubber solution on the chip and now I have cleaned it off looks fine but you can see chip details better. Hopefully the rubber solution (or what ever it is) that they put on in manufacture was making the chip look blown or an issue. Have a look see what you guys think ? Also I think you have messaged people with a work around - could you please let me have a copy, Thanks Paul

Thanks Colin not being an electronics expert I think you'r saying that the board is broke - Does anyone know where you can just buy the board ? rather than the whole unit ? looks like im in shopping mode now 🙂 Thanks

Ok so after removing Rear boot motor found droplets of water inside of roof also slight water on Roof rail bottom bolts not much though, Small droplets on plastic cover for printed circuit board looks more like condensation but who knows, All electrics were dry just a few droplets on cover I am getting 12v from the large yellow cable on plug and also 12v on thin brown wire on right hand side of plug - Does this mean I am getting power to the back for the motor ? As stated before 30amp in engine bay is ok, not sure where relay is but assume working as power to rear motor ? just trying everything before maybe getting a new unit 😞 Thanks Paul

is that a commonality ? are all cars being affected have roof rail bolts ? I will check mine out thanks.

Hi, after having a bit of a leaky RX300 rain ingress and now own a 2010 RX450H and experiencing the fatal rear boot motor issue on my premier Model, Checked 30 amp fuse in engine (bus bar) if you have a light and a magnifying glass you can just see the soldered Joint for the fuse, all good. couldn't find relay for PBD ? but did start taking boot and rear roof apart, I have spent most of the day reading the forums for info (interesting) but no real solution apart from expensive costs and several potential causing issues. My Aux Battery is new and was installed about a year ago so all good. I did notice however when looking at the motor in the rear roof of the car drops of water were seen, water on inside of roof also sointhe process of drying to see if it recovers. However while looking at this issue has anyone reported if they have sun roof cars ? does the drain pipe run to the back on the RX450H ? or rear door seal causing issues, certainly looks like mine is a water ingress issue that has caused the motor to go. I'll keep investigating 🙂