On my new Rx400h the doors automatically lock when I drive faster than about 5 mph. I want to stop them doing this so I have carefully followed the instructions on page 60 of the manual. Nothing seems to work. Am I missing something obvious or is there a magic word that I have to use?

AFAIK this should be a car memory option set by the Dealer only...

Why would you want to disable this? It is a safety feature, kids cannot unlock the car while it is moving and nobody can open your car at say traffic lights and attack you or steal something off the seat. It certainly isn't a hindrance 'cos all the doors unlock when you unlock yours or at the push of a switch?

Well I have a 300 and I would love to be able to get my doors to lock as the car moves off. Is there a way to program this in.

Found this on the web

I think this lot might help

(a) Locking linked with the shift position

All the doors are locked automatically when the selector lever is moved out of the "P" position with the ignition switch in the "ON" position. This is suppose to be the default setting for new vehicles.

(b) Unlocking linked with the shift position

All the door are unlocked automatically when the selector lever is moved to the "P" position with the switch in the "ON" position.

© Locking linked with the vehicle speed

All the doors are automatically locked when the vehicle speed reached 12 mph or higher. However, if any door is unlocked during driving, the auto function will not operate until the unlocked door is opened once.

(d) All the doors are unlocked automatically when the driver's door is opened within 10 seconds after the ignition switch is turned from "ON" to the "ACC" or "LOCK" position.

Setting the functions
1. Close all the doors.
2. Turn the ignition switch to the "ON" position.
3. Within 10 seconds after the ignition switch is turned to the "ON" position;
+To set function (a)
Push and hold the front of the power door lock switch for 5 seconds with the selector lever in the "P" position.
+To set function (b)
Push and hold the rear of the power door lock switch for 5 seconds with the selector switch in the "P" position.
+To set fuction ©
Push and hold the front of the power door lock switch for 5 seconds with the selector switch in any position except "P".
+To set function (d)
Push and hold the rear of the power door lock switch for 5 seconds with the selector switch in any position except "P".

All the doors are automatically locked and unlocked when you release the power door lock switch. This indicates that the functions is set. If all the doors do not lock and unlock, the time the switch was held may have been too short or too long. Perform the procedure over again starting at step 1.

If you want to cancel a function, repeat the procedure. Each time you perform the procedure, the function is set or cancelled.

Hope it helps Nev

I looked into memory settings on the RX300 - but it appears that these cars (certainly the MKII) don't have this ability. This functionality first appeared on the 400h. Shame really that they overlooked something as basic as this on a £35k SUV.

This doesn't do anything on my RX400h.
Shame because it would have been useful.

When I collected my new RX400 the doors locked at about 5-10 mph, but you had to unlock them when you came to rest. A quick (10minutes) at the dealer & I had the doors set to lock as before, but unlock when I put the shift to park- so I can let passengers out safely, the car's in park & then drive off & the doors lock again. It's a piece of mind thing, when she who mst be agreed with drives on her own at night for example. Incidentally the dealer also adjusted the interior light delay (time on after you switch off the motor) - there are anumber of little custom settings you can have changed, which is nice to know if not always wanted - the handbook covers most of the options if you are looking for a little "light reading" come bedtime!