Toyota Zelas / Scion TC all key lost programming Guide

Unlike many Toyota car new models with smart system integrate the immo box into the steering lock, Toyota Zelas 2011 model haven’t, the immo box is under the Dash, not in the steering lock. So the steps will be like we wrote about the Previa: How To Reprogramming Toyota Previa When All Key Lost?


Step 1: Reset immo box. Disassemble immo box NO. 89784-21010 which placed in a groove of the back of evaporator under the dash, open box and find the EEPROM chip 93C46 on the board, read the chip by key programmer like Yanhua key mater, VVDI prog etc. Save the data and backup. Modify the data like this: replace the bytes of red underline with 0, this area is the quantities of keys, reset is to make it to learn keys, zero means no key, need to learn new key. The bytes with blue underline is the data synchronizes with engine, retain. Other bytes all replace with F.


Step 2: Reset smart box. Disassemble smart box No. 89990-21010 located near A-pillar behind glove compartment. Open the box and find the EEPROM chip 93C86 on electronic board. Read the chip with key programmer. Save data and backup. Modify the data like this: retain bytes of blue underline, other bytes all replace with F.




Step 3: add the key. Assemble immo box and smart box back to car. Connect universal key programmer with car OBD, Push START Button of car, run the key programmer and select smart system, follow the steps to make the logo of key fob held close to START button, comes with “beep beep”, that is match successfully. Then start the car, no need to do synchronization process.


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