Hi All,

Recently my 2010 350X will lock with the key fob, however when I try to unlock, it emits three beeps and the indicator lights flash three times, but it will not unlock.

I have to manually open the driver's side with the key then unlock each door manually.

When the ignition is on, the unlock bottom on drivers side will not do anything.

The car does lock with the fob. The tailgate also opens as well, but none of the other doors will.

I have recently got a new car battery, and changed the key fob batteries. Anyone have any other ideas of what to test?

When you are inside the car and lock it with the remote, can you unlock it from the inside where it unlocks all the doors? do all the doors clunk as they unlock?

Does the central locking control on the drivers door unlock and lock, or only lock?

It sounds like the solid state relays on the ECU are 'sticking'.

Hi @Curiousgeorge

that sounds like a really annoying problem to have! It's a bit of a head-scratcher when one part works and the other doesn't.

Chris.ac makes a good point about the driver's door control.

If that's only locking and not unlocking from the inside, it might point to something a bit more complex like the ECU, as they mentioned.

Worth checking that first to see if it behaves differently. Fingers crossed you get it sorted soon!

Cheers Tango

Three beeps and three flashes on these usually means the car thinks a door is still open or it is seeing a fault in the unlock circuit, so it refuses the command. The fact it will lock from the fob but not unlock from the fob or the drivers switch (with ignition on) is a good clue that the unlock side of the system is what is failing rather than the key. A couple of quick checks that narrow it down fast

When you unlock manually with the key, do any of the other doors try to unlock on their own, or is everything completely dead and you have to do them one by one

Does the dash show any door ajar warning when all doors are shut, including the tailgate.

If you press unlock on the drivers switch with the ignition on, can you hear any faint click from the dash area or door, or absolutely nothing Common causes on 20 series Alphard Vellfire Door lock actuator failure can stop that door responding, but it would not normally stop the drivers switch unlocking all doors. Still worth checking if one door is reporting ajar, as the car can behave oddly if it thinks a door is open. Body ECU or its unlock driver is failing. People often describe it as the relays sticking, but it is effectively the unlock output stage not driving the actuators properly. That matches lock working but unlock not from anywhere. Practical next step if you have access to Techstream or a decent scan tool Check the Body ECU for DTCs and live data for each door courtesy switch.

If one door is showing open when it is shut, fix that first. If all door status looks correct and there are codes relating to door lock motor or unlock circuit, that points more to wiring or the Body ECU output. Also worth a basic electrical check Confirm the drivers door switch connector is seated and the wiring in the hinge area is not cracked. A broken unlock wire in the door jamb can kill the switch function, but it would not usually stop the fob unlock too, which is why I am leaning ECU output or a system wide inhibit from a door ajar signal. If you can answer the three questions above, especially whether any door ajar is showing and whether there is any sound when pressing unlock on the switch, it will help the group pin it down quickly.

Hope it works out!