Toyota Yaris: Smart Key System (for Entry Function) / System Diagram

How To Proceed With Troubleshooting

CAUTION / NOTICE / HINT HINT: Replace parts related to the wireless door lock and smart key system according to the inspection procedure. If the wireless door lock and smart key system does not operate, first check the customize item and make sure that the wireless door lock and smart key system is not turned off...

Operation Check

OPERATION CHECK CHECK CUSTOMIZE PARAMETERS NOTICE: The operation check below is based on the non-customized initial condition of the vehicle. Click here CHECK THE ENTRY UNLOCK FUNCTION (a) Check the entry unlock function (driver door, front passenger door)...

Other information:

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: Supply Voltage Circuit Circuit Voltage Out of Range (C123A1C)

DESCRIPTION When a malfunction has occurred in the power source circuit, the AWD ECU assembly stores DTC C123A1C. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory C123A1C Supply Voltage Circuit Circuit Voltage Out of Range At a vehicle speed of 3 km/h (2 mph) or more, the IG1 terminal voltage is less than 9...

Toyota Yaris XP210 (2020-2026) Reapir and Service Manual: All Door Entry Lock/Unlock Functions and Wireless Functions do not Operate

DESCRIPTION If the entry lock and wireless door lock operations cannot be performed, the smart door control receiver assembly may be malfunctioning, or there may be wave interference or problems in the communication which is used for the entry and wireless function between the smart door control receiver assembly and certification ECU (smart key ECU assembly)...