Hi. I have a 2006 LEXUS LS430. While driving back from the supermarket two weeks ago, the NSR door opened a fraction and, as I rounded a corner, it flew open. Bit hair-raising to say the least. It seems the actuator has failed and despite locking it and applying the child lock, it still opens.
I've found a part - used, which should be around this week. Lexus Swindon originally quoted me £238.00. Used part was lost in transit (Hermes) so I went back to Swindon. Miraculously, the price had risen to £840.00. Not impressed.
If you have one of these cars, it is possible you will suffer the same issue. It's a serious problem; dogs, passengers, parcels might have been ejected.