Smart Key not detected

I have a 2016 Prius c (smart key with

push button start). When I got the water damaged car the auxiliary battery was low(2.5 V). Charged it to 12 V. Hooked up auxiliary battery cables to 12 v auxiliary battery and dash lit up.


When I first pressed push to start button dash said goodbye and shutdown. When I then pressed push to start button the dash would not power back up.


However when I then disconnected the auxiliary battery cable again and reconnected the auxiliary battery cable the dash lit up. When I then pressed push to start again the dash said goodbye again and shut down. With auxiliary battery connected again for the second time and push to start pressed the dash would not power back up.


The third time I disconnected the auxiliary battery cables and connected to the auxiliary battery the dash did not light up. The Red immobilized light was not working properly - only saw a lock for split second and then went away.


I Installed a used smart key ECU and now immobilizer light shows the red lock and appears to be blinking properly. I also installed a used body Ecu and used hybrid ECU. The inside locks and lights appear to be now working properly.


The Denso smart key fob never was able to remotely unlock the car. The mechanical key that was stored in the smart key housing works properly in the door locks.


I am trying to get the car in auxiliary mode so I can read code with my innova 3160 or get a tech stream system.


When I press push to start I get a beep and the dash says key not detected. Is there any recommendations so that the key not detected issue can get resolved and I can then get the car in auxiliary mode.

 

Today I had a lock smith in San Diego try to get rid of the key not detected error and he got Security Algorithm Error as shown in the attached. He thinks the computers need to be reseeded. Is there any member in San Diego that has equipment to help with reseeding or another method to resolve the key not detected issue if I pay for assistance.

 

On older Toyota’s using a paper clip between pin 4 and 13 on obd 2 pins could be used to reset ECU. Since a Prius C has more than 15 ECUs including a smart key ECU and vehicle ID box am I correct to assume that this procedure (shorting pins 4 and 13) would not help any in trying to get me closer to resolving my key not detected issue.

 

Requesting help/recommendations from the Prius chat community.
I tried getting the smart key system back yesterday and was unsuccessful. I tried a smart code reset with tech stream 13.00.022 and a mongoose pro mfc passthrougjh and was unsuccesful (Win 10/64 computer).I tried web octopus token to get the
Pass code. 3 passcodes tried -1 token used. Not sure if passcodes were bad or another Ecu such as Id box (immobilizer Ecu) or the eBay certification Ecu that I tried resettingi is bad. Any help with recommendations will be greatly appreciated. After I entered the passcode I got now resetting in red on techstream, caution keep drivers door open. Time remaining 16 min. I then immediately got smartcode reset has failed with yellow triangle. Do you want to try again? Any recommendations on what to try will be greatly appreciated.

 

Do any Prius chat members no how to check the id box ( immobilizer ecu) without removing from a Prius C or another Prius model? Has anyone ever removed one?

 

Avi, from Hybrid Fix and 3 Prong Paul from Boulder Hybrids are absolute geniuses. They helped when 3 separate dealers had no good recommendations to try. Between recommendations from 3 Prong Paul and brilliant recommendations from Avi from Hybrid Fix ncluding the certification ecu 93C EEPROM change the Prius C now goes in accessory mode. Prius C shifter will not move and car will not go in drive yet. I will work this also as the car now goes in accessory mode and since it got water damaged it may need to be swapped out also. I plan on using techstream this weekend and next week to gather more info on the car and swap ECUs around including trying to put some of the original ECUs back in (Body control and Hybrid Vehicle Control - Avi recommendation).

 

Replaced the water damaged air bag Ecu (center console location - 89170-52L80 on Saturday. Trouble codes P3107, U0124 and U0151 were successfully cleared after swapping out/techstream reset the water damaged air bag Ecu with the Ebay air bag ECU. Making progress but still have a long way to go with the attempt to get the Prius C running. Codes that are now remaining are U029A, C1259, C1310, 4 air conditioning codes B1441, B1442, B1443, 14B2 and drivers door motor B2311. My focus next will be on trouble codes U029, C1259 and C1310. Will contact Avi from Hybrid Fix and 3 Prong Paul from Boulder Hybrids and go over the new data and possible recommendations.

 

Codes mentioned above from techstream provided in the attached.