TRo

Hi No I was very impressed with the response of the Service Manger - I just described over the phone the noise of the "brake squawk " and he explained that he had come across this several times on the RX plus one or two other models He went to outline that he would order the parts and he phoned me back to arrange to collect the car and undertake the repair - all under warranty. After the work was completed and the issue resolved I asked for a copy of the Lexus Bulletin so I could share the information on the Forum in the hope that the document might help another RX driver experiencing the "brake squawk", particularly as it would seem that some Lexus Service Mangers are not aware of the problem.

Hi The Service Manager explained that the most expensive part was the brake actuator and the remaining parts plus work undertaken are detailed on the Lexus Bulletin attached to the original post. He also commented that the ECU had been updated with the latest programme but I am not to sure what specific benefit that has added to the cars performance ?

Hi Although this topic has been addressed I thought I would share my experience particularly as my local Dealership sent me a copy of the Lexus Bulletin which authorises the repair under warranty. I purchased an approved used RX 450h and within a few days noticed the dreaded " brake squawk " at low speeds particularly when reversing yet the Dealership failed to diagnose the cause of the issue. Convinced there was a problem I phoned several Lexus Dealerships describing the fault and one Service Manager immediateley identified the " brake squawk" arranged for the parts to be ordered and booked the car in for the repair all under warranty which would have cost £3500 So in case this happens to anyone else I have attached a link to the Lexus Bulletin Hope this may be helpful https://static.nhtsa.gov/odi/tsbs/2021/MC-10203537-9999.pdf

Hi Thanks again for your response particularly the information that your wife's UX 12 volt battery is currently showing 12.2 volts after a good run earlier in the week followed by short runs and that you now plan put it on charge. Since I had the new battery, taking a reading first thing in the morning, the average drop in voltage compared to the previous day is between 0.04 and 0.07 volts. ( I assume subject to the outside temperature etc.) Would you say in your experience that if the UX was not driven for say seven days an average daily drop in voltage would be around 0.05 volts so if the multi meter reading started at 12.6 volts after seven days you would expect the reading to be around 12.25 volts (12.6 minus 0.35 volts) ? If not it looks more likely my UX has a "parasitic drain " Thanks Tony

Hi Firstly, thanks for your reply. Yes after a longer run the new battery showed 12.77 volts using a multi meter (again whilst connected in the car) The difficulty is that I am concerned that the car could have been experiencing a "parasitic drain" but as this is the first hybrid I have owned I don't have any knowledge of what the normal car 12 volt battery reading should be particularly as I drive the car infrequently. That is why I was seeking help on the forum. I have contacted my local Lexus Dealership and was told that " Anything above 12 volts is fine particularly if the car is not driven for up to a week" I have a solar charger I can use but until I know what a normal 12 volt battery reading is in a UX 250h that is driven infrequently I am uncertain when it is necessary to recharge the battery. Thanks Tony

Hi I am trying to monitor my new 12 volt battery fitted by my local Lexus Dealership on my 2019 UX250h with a multi meter whilst connected in the car - aware that the 12 volt battery is in demand immediately the driver opens the door/hatch (internal lights/security etc) So I would be grateful for other UX 250h drivers experience : After a short run ( under 5 miles ) the 12 volt battery is showing = 12.45 VOLTS Car not driven (96 hours ) the 12 volt battery is showing = 12.27 VOLTS Thanks Tony

Hi Has any owner of a UX 250h successfully used a 12 volt car battery solar charger plugged into the cigarette lighter socket ? Thanks !

Hi I am considering buying a UX 250h from an independent garage ( not a Lexus main dealer ) and I am trying to find out if there is any restriction that would invalidate the hybrid battery warranty Thanks