Toyota Yaris: Smart Key System (for Start Function) / Security Indicator Light Does not Blink

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Security Indicator Light Does not Blink

DESCRIPTION

The certification ECU (smart key ECU assembly) blinks the security indicator light (combination meter assembly) when the immobiliser is set (engine switch off).
The certification ECU (smart key ECU assembly) receives the security indicator light signal from the main body ECU (multiplex network body ECU) via CAN communication when the theft deterrent system is in the arming preparation state or alarm sounding state. Then, the certification ECU (smart key ECU assembly) blinks the security indicator light (combination meter assembly).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
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Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to the Registration.
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Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.
After completing repairs, confirm that the problem does not recur.
After repair, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".
When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

PROCEDURE

1.	CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes Powertrain > Engine > Trouble Codes

OK:

DTCs are not output.

GO TO DIAGNOSTIC TROUBLE CODE CHART

2.	PERFORM ACTIVE TEST USING GTS (IMMOBILISER INDICATOR)

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Smart Key > Active Test

Tester Display	Measurement Item	Control Range	Diagnostic Note
Immobiliser Indicator	Security indicator light	OFF/ON	-

Body Electrical > Smart Key > Active Test

Tester Display
Immobiliser Indicator

OK:

The security indicator light (combination meter assembly) operates normally.

GO TO STEP 4

3.	CHECK SECURITY INDICATOR LIGHT (COMBINATION METER ASSEMBLY) OPERATION

(a) When the immobiliser is set, check that the security indicator light (combination meter assembly) blinks.*1

OK:

The security indicator light (combination meter assembly) blinks normally.

(b) When the theft deterrent system is in the arming preparation state, check that the security indicator light (combination meter assembly) illuminates.*2

OK:

The security indicator light (combination meter assembly) illuminates normally.

Result	Proceed to
1 is NG (2 is OK)	A
2 is NG (1 is OK)	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

4.	CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - SECURITY INDICATOR LIGHT (COMBINATION METER ASSEMBLY))

(a) Disconnect the H46 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the H7 combination meter assembly connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
H46-25 (IND) - H7-7 (LP)	Always	Below 1 Ω
H46-25 (IND) or H7-7 (LP) - Other terminals and body ground	Always	10 kΩ or higher

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the H46 certification ECU (smart key ECU assembly) connector.

(b) Reconnect the H7 combination meter assembly connector.

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

Measurement Condition:

Tester Connection	Switch Condition	Specified Condition
H46-25 (IND) - Body ground	Ignition switch off → ON	Pulse generation → Below 2 V

REPLACE SECURITY INDICATOR LIGHT (COMBINATION METER ASSEMBLY)

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

Steering Lock does not Lock

DESCRIPTION The steering lock ECU (steering lock actuator or upper bracket assembly) activates the steering lock motor and moves the lock bar into the steering column to lock the steering...

Immobiliser System does not Operate Properly

DESCRIPTION The immobiliser function compares the ID code that is registered in the certification ECU (smart key ECU assembly) with the ID code of the transponder chip that is embedded in the electrical key transmitter sub-assembly...

Other information:

Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Diagnosis System

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Toyota Yaris XP210 (2020-2025) Reapir and Service Manual: Components

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