Toyota Yaris: Smart Key System (for Entry Function) / Problem Symptoms Table

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Entry Function) / Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

HINT:

If a problem occurs in certain locations or at certain times of day, check for the possibility of wave interference.
When the electrical key transmitter sub-assembly is brought near a smart door control receiver assembly (RF band), door outside handle assembly (LF band), indoor electrical key antenna (LF band) or any of the electrical key antennas (LF band), the possibility of wave interference decreases. By doing this, whether wave interference is causing the problem can be checked.
Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.
Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Smart Key System (for Entry Function)

Symptom	Suspected Area	Link
Key vehicle inside lock-in prevention function does not operate	Affected by wave interference
	Harness or connector
	No. 1 indoor electrical key antenna assembly (front floor)
	No. 2 indoor electrical key antenna assembly (rear floor)
	Certification ECU (smart key ECU assembly)
	Transmitter battery
	Power distribution box assembly
	Engine switch
All door entry lock/unlock functions and wireless functions do not operate	Lighting system
	Power door lock control system
	Affected by wave interference
	Code registration
	Transmitter battery
	Harness or connector
	Electrical key transmitter sub-assembly
	Smart door control receiver assembly
	Main body ECU (Multiplex network body ECU)
	Certification ECU (smart key ECU assembly)
All door entry lock/unlock functions do not operate, but wireless functions operate	Check customize setting (Auto entry cancel setting)
	Affected by wave interference
	Electrical key transmitter sub-assembly
	Certification ECU (smart key ECU assembly)
Driver side door entry unlock function does not operate	Power door lock control system
	Harness or connector
	Front door outside handle assembly LH
	Lighting system
	Certification ECU (smart key ECU assembly)
Front passenger side door entry unlock function does not operate	Power door lock control system
	Harness or connector
	Front door outside handle assembly RH
	Lighting system
	Certification ECU (smart key ECU assembly)
Driver side door entry lock and unlock functions do not operate	Power door lock control system
	Affected by wave interference
	Harness or connector
	Front door outside handle assembly LH
	Certification ECU (smart key ECU assembly)
Front passenger side door entry lock and unlock functions do not operate	Power door lock control system
	Affected by wave interference
	Harness or connector
	Front door outside handle assembly RH
	Certification ECU (smart key ECU assembly)
Driver side door entry lock function does not operate	Power door lock control system
	Harness or connector
	Front door outside handle assembly LH
	Certification ECU (smart key ECU assembly)
Front passenger side door entry lock function does not operate	Power door lock control system
	Harness or connector
	Front door outside handle assembly RH
	Certification ECU (smart key ECU assembly)
Entry interior alarm does not sound	Meter/gauge System
Entry interior alarm does not sound	CAN communication System
Back door entry unlock function does not operate	Power door lock control system
	Harness or connector
	Back door opener switch assembly
	Certification ECU (smart key ECU assembly)
Back door entry lock and unlock function does not operate	Power door lock control system
	Affected by wave interference
	Harness or connector
	Back door opener switch assembly
	Electrical key antenna (outside luggage compartment)
	Certification ECU (smart key ECU assembly)
Back door entry lock function does not operate	Power door lock control system
	Harness or connector
	Back door opener switch assembly
	Certification ECU (smart key ECU assembly)
Entry exterior alarm do not sound	Lighting system
	Harness or connector
	Certification ECU (smart key ECU assembly)

Customize Parameters

CUSTOMIZE PARAMETERS CUSTOMIZE SMART KEY SYSTEM (for Entry Function) HINT: The following items can be customized. NOTICE: When the customer requests a change in a function, first make sure that the function can be customized...

Terminals Of Ecu

TERMINALS OF ECU CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (a) Disconnect the H46 certification ECU (smart key ECU assembly) connector. (b) Measure the voltage and resistance according to the value(s) in the table below...

Other information:

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