I have a specific problem I can't get my head around. I bought a 2016 Prius V. After replacing the keyfob battery, I discovered these: 1. If I press the start button, nothing happens. It doesn't beep to tell me there is no keyfob, it also doesn't recognise the keyfob. Same thing happens if the keyfob is outside the car. 2. The keyless entry on the driver's door does not work. If I grab the handle, the door does not open, if I touch the lines, the door does not lock. 3. The door opens or locks if I use the buttons on the keyfob. The alarm button also work. 4. I can start the car if I touch the keyfob logo on the start button. However, if I open the door while the engine is running, it doesn't prompt me for the keyfob. 5. When I connected Techstream to the car, it shows a different VIN number. I assume a specific ECU was replaced before purchase? 6. I programmed another keyfob, but it behaves exactly like the other keyfob. Please see the data list attached. Kindly help me out with a solution.
I know nothing about this issue in the Prius (had it occur in the Honda), but I note in your scan page ‘Master Key = Match’ and ‘Sub Key = No Match’ and ‘Number of Registered Key Codes 5’, and wonder whether those plus the ECU mismatch are important hints.
Do you mean B2799? Is that the only code the car has? Did you use a meter to read the voltage of the new battery that you installed into the fob?
You are correct, B2799. That's the only code. I didn't, but I programmed a known working keyfob from another PriusV and it has the same behavior.
Thanks for the reply. I did a search. It appears that the problem is because of the different ECU that was installed into the car. Take a look at this post by @ChapmanF,, https://priuschat.com/index.php?posts/3038930 Look at the freeze frame data for the P2799 code for the INF detail code. That may help narrow down the problem.
Okay, disregard the link that I provided in post #7. This could still be related to the ECU mismatch. Did the key fob work properly before you replaced the battery? I did some searching and found the following information. Code B2779 Toyota Description When an internal malfunction occurs in the Certification ECU (Smart Key ECU Assembly), the Certification ECU (Smart Key ECU Assembly) stores this Diagnostic Trouble Code (DTC). B2779 Toyota Code - Engine Starter Communication Malfunction What are the Possible Causes of the DTC B2779? Faulty Certification ECU (Smart Key ECU Assembly) Certification ECU harness is open or shorted Certification ECU circuit poor electrical connection I would try to determine if the remote start is OEM or aftermarket. If it is an aftermarket kit, I would remove it from the car.
I think it would be installed near the OBD2 port. I have no experience with these systems. Each manufacturer of these kit will be a little different. I did a quick search and found this website for 12volt.Solutions. Scroll down to the video at the bottom of the page. Here is a more detail installation video, . You can do a search for other companies that make these remote start system for more information. Here is a more detailed video from another manufacturer. PRIUS9 – Start-X FYI, I edited post #9 a little.
I have searched thoroughly, but I was unable to locate any installed remote start system. Additionally, pressing the lock button three times does not initiate the vehicle.
