I have a 10 year old Lexus RX400 which was working perfectly yesterday however today I can't unlock it. I've tried all 3 keys and none of them will work. The red light on the key flashes when I press unlock so the battery can't be dead (and to die on all 3 on the same day would be very coincidental!). I can open the car door manually but then the immobiliser kicks in and the car will not start. Any help?

  • I take it the car battery isn’t dead? If the immobilizer is kicking in try turning the key in the passenger door 3 times if it doesn’t have a passenger keyhole do it in the drivers door.
    – Ben
    Aug 31, 2018 at 19:40

1 Answer 1


Your Receiver door control which receives signal from your remote keys is not functionning. Below is the location of the receiver: enter image description here

I would do the following:

  1. Disconnect and reconnect to check the if keys are working
  2. Reprogram the keys to see if they are working again (https://www.youtube.com/watch?v=SmCN-YDkqwo&vl=en)
  3. Replace the unit if this is not the case
  • 1
    1 - disconnect and reconnect what? The receiver, the vehicle battery? the remote?
    – Solar Mike
    Aug 31, 2018 at 14:04
  • The door receiver control
    – Yasirmx
    Sep 18, 2018 at 18:57

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .