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

Toyota Yaris XP210 (2020-2022) 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.

NG

GO TO DIAGNOSTIC TROUBLE CODE CHART

OK

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.

NG

GO TO STEP 4

OK

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

A

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

B

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.

(c) Measure the resistance according to the value(s) in the table below.

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

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.

(c) Using an oscilloscope, check the waveform.

*a

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

OK

REPLACE SECURITY INDICATOR LIGHT (COMBINATION METER ASSEMBLY)

NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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