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Hello Lexus community! Hoping I could get some help or feedback with a recent problem I am having!
Problem: All my key fobs stopped working when I jump started my car a few weeks. By stopped working, I mean that the battery is ok which I tested multiple fobs to confirm but the button functions (Lock, unlock, etc) do not work don't work on any of them. Additionally the keyless entry systems do not work either. Starting the car has no issues if the keys are present however.
Solutioning so far:
I decided to start troubleshooting by checking if I blew a fuse somewhere. I replaced all the micro blade fuses with these Carax LED fuses as 1. an upgrade to help support future electrical troubleshooting and 2. leave me some spare fuses which I didn’t have any of. Unfortunately none of the fuses I replaced (2 boxes under the hood and the 1 box under the dash) had a single blown fuse lol. We can rule this out.
Anyone have any suggestions for next steps before I give the dealer a call to check if my keys just need to be reprogrammed?
Additional notes: Lexus Enform does not support lock/unlock anymore either after this happened...doh!
I actually had the opposite. My key fob locked/unlocked the doors and opened the trunk, but wouldn't start the car. Press the sos button or bring it in.
I actually had the opposite. My key fob locked/unlocked the doors and opened the trunk, but wouldn't start the car. Press the sos button or bring it in.
That sounds like some problem with the immobilizer or chip in the key but yea it seems to be quite similar. Did you end up going to the dealer?
Are you a member of the "Lexus Enform" app.? If you are then maybe you can ask by using the SOS button to talk to a Rep.
Yep I am an Enform user and the app was not working to use the lock and unlock features as well. I ended up having the car looked at by my local dealership and the tech working on my spent 3 hours of diag (I think this was fraudulent but I can't prove it so who cares) . In that time they mentioned looking at the fuses but ultimately stating that the root cause was continuity from the battery to the MPX-B No.1 Fuse. They said they removed and dissambled junction box and 'noticed' loose connection in fusible link between 30amp DC cut fuse to 10 amp MPX-B no.1 fuse which they re-secured. I had some interesting codes which came up while this problem occurred. (C1625, C1432, C1784 but there was no issues with the steering sensors or engine compartments)
At any rate, they good willed me a new screen for scuff peeling issue that happens in our RC's and I justified the insane dealer rates with that hah!
Additionally I added a new start up screen/screen power off image and made a DIY for those interested. Link can be found here:
Key Fobs Stopped Working
