Toyota Yaris: Smart Key System (for Start Function) / System Diagram
SYSTEM DIAGRAM
SMART KEY SYSTEM (for Start Function)
SMART KEY SYSTEM (for Entry Function)
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PARTS LOCATION ILLUSTRATION
*1 ECM *2 NO. 1 ENGINE ROOM RELAY BLOCK ASSEMBLY - ST NO. 1 FUSE - EFI NO. 1 FUSE - IGP RELAY - ST NO. 1 RELAY *3 SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) - - ILLUSTRATION
*1 NO...
CAUTION / NOTICE / HINT HINT:
Replace parts related to the wireless door lock control system and smart key system according to the inspection procedure...
Other information:
After replacing the engine oil, have a repair shop such as your Toyota
dealer perform the initialization (engine oil data resetting) of the
recorded value. If the value recorded by the computer is not initialized,
the wrench indicator light may not turn off or it may turn on earlier than
normal...
DESCRIPTION The AWD ECU assembly receives signals from the ECM, steering sensor and skid control ECU (brake actuator assembly) via CAN communication. DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory U010087 Lost Communication with ECM/PCM "A" Missing Message When the ignition switch is ON, the IG1 terminal voltage is 10 V or more and the vehicle speed is 60 km/h (37 mph) or more, signals cannot be received from the ECM for 1 second or more
CAN communication system
AWD ECU assembly
ECM
Displayed Yes U012687 Lost Communication with Steering Angle Sensor Module Missing Message
When the following continues:
When the IG1 terminal voltage is 10 V or more, communication with the steering sensor is impossible for 1 second or more
When the IG1 terminal voltage is 10 V or more, a condition in which communication with the steering sensor is impossible occurs 1 time or more within a 5-second period, and this occurs 10 times within 60 seconds
CAN communication system
AWD ECU assembly
Steering sensor
Displayed Yes U012987 Lost Communication with Brake System Control Module Missing Message When the IG1 terminal voltage is 10 V or more, communication with the skid control ECU (brake actuator assembly) is impossible for 3 seconds or more
CAN communication system
AWD ECU assembly
Skid control ECU (Brake actuator assembly)
Displayed Yes PROCEDURE 1...
Categories
Before refueling, close all the doors, windows, and the liftgate/trunk
lid, and switch the ignition OFF.
To open the fuel-filler lid, pull
the remote fuel-filler lid release.

To remove the fuel-filler cap, turn it counterclockwise.
Attach the removed cap to the
inner side of the fuel-filler lid.
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