Smart Key won't work : code B2775

Hi all !

My key fob can't open/close the car when pressing the buttons on the fob, it won't open when touching the handle (nor the trunk) and I can't start the car other than putting the key in the slot.

I can close/open all the doors with the button of the drivers door.

My 12V battery is new and ok. Fob's battery are new (on both keys).

When I use Techstream, I have the code B2775 "Interior Verification Abnormal (To Theft Deterrent ECU)". I read it was an immobiliser problem...

Any one had this code once ?

thanks !

 

Last time both keys worked was 3 month ago. It happens with both fobs.
I can lock/unlock doors with the button inside the driver's door. The black button in the handle outside the driver's door won't work.

I was reading this but don't know how to proceed to "reregister the ECU communication ID code" (see attached file)

Maybe the wiring between the two ECUs is damaged or an ECU may have failed.
The only times it worked again (all Smart Key functions I mean) is when the car stays at full sun and inside the vehicule it's very hot ! Once the car is cooled (e.g : when I put the AC), if I stop the car and try to start again, the problem comes again !

 

Where is located or how to access to this harness ? Is there an image or diagram please ?

 

Fixed ! With... a hair dryer and some contact cleaner .
Well, fixed is a big word...
The problem comes from the Smart Key ECU.
It worked 30mn then again failed. I cleaned again and heated more and now it's been working for 3 hours. Air is fresh outside.
I'll see tomorrow if it's still working.
I had lots of error codes and red triangle after mounting back everything but cleaned most of them with Techstream. The only code wich I can't clear is an AC linked code (B1421) but I don't care much.

 

thanks for your help, BTW You told me the transponder KEY ECU is where the fob slot is but referring to this image, it seems to be located behind the AC system.

 

yes, it's a very difficult place to access. Actually, I think to access this piece, you have to take out all the AC...

Today the smart key system is still working well !

 

Ok, the B1421 is gone ! But the problem is back with the Smart Key. Now, I'm looking for a part to buy it and swap it. Where can I find that ? In France it's almost impossible...

 

Hi all !

The problem with the smart key is too much intermittent so I decided to replace this part.

So, here I am with a 2nd hand smart key ECU and part numbers are perfectly matching. I found one in Sweden for 60€, if anyone in Europe is searching for parts, this site is very good and serious : http://en.bildelsbasen.se/

Anyone knows if I just have to swap the smart key ECU or do I have to reset the 2nd ECU once it will be installed ? I've read that if you change the TRANSPONDER you have to match ID's with the hybrid vehicle control ECU but what about the smart key ECU ?

 

I have the big PDF manual and troubleshooting for the Prius 2, following the registration procedure (I think it's this one) it says that I have 4 modes : New registration mode, Add mode, Communication mode, Erasure mode.

Knowing that the replacement part is an already USED smart key ECU, wich mode do I have to follow ?