Toyota Corolla 4C Chip 2004 lost key using EEPROM

How to: Toyota Corolla old model pre-2004 lost key programming using UPA USB EEPROM programmer and TM100. This car has 4C chip and can be made programming 93C56 EEPROM in Car ECU / ECM.

Step 1: Read EEPROM

Disassemble ECU under the dashboard

Open ECU box, locate EEPROM IC 93C56

Desolder IC chip and solder it to UPA EEPROM 93CXX adapter using a hot gun

Connect 93CXX adapter and UPA with laptop

Open UPA USB v1.3 programmer software

In EEPROM, select 93C56x16->Read->Save with any name

Step 2: Write Key 

In TM100 transponder key programmer, select Key Maker->Toyota->Corolla->ECU->-2004 (93C560(4C))

Press Open Dump File, open saved EEPROM file read by UPA

Select key position (from any of the 4 positions) to add new key
Press Write Key

Save the new file created with any name (here we have used Key 1)

Open Last saved file again to add another key at any pisition you like
Press Write Key

Save new file again with some other name (here Key 2)

Open last saved file to verify newly added keys

Step 3: Write data back

Go back to UPA software

Open last saved file in TM100

Select 93C56x16 and press Program to write new file to EEPROM

Solder EEPROM chip back to ECU
Reinstall ECU to vehicle
Test the new keys and start car.

Done.

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http://blog.obdii365.com/2018/12/28/program-toyota-corolla-2004-4c-lost-key-with-upa-tm100/