Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Security Indicator Light Does not Blink

Toyota Corolla Cross (2022-2024) Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function, Hev Model) / Security Indicator Light Does not Blink

DESCRIPTION

  • The certification ECU (smart key ECU assembly) blinks the security indicator light (air conditioning control assembly) when the immobiliser is set (ignition 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 (air conditioning control 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 Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Start Key(CAN). 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.

    Click here

  • Before replacing the certification ECU (smart key ECU assembly) or main body ECU (multiplex network body ECU), refer to Registration.

    Click here

  • 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".

PROCEDURE

1.

CHECK FOR DTC

(a) Check for DTCs.

Body Electrical > Smart Key > Trouble Codes Powertrain > Hybrid Control > 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 (air conditioning control assembly) operates normally.

NG

GO TO STEP 4

OK

3.

CHECK SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY) OPERATION

(a) When the immobiliser is set, check that the security indicator light (air conditioning control assembly) blinks.*1

OK:

The security indicator light (air conditioning control assembly) blinks normally.

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

OK:

The security indicator light (air conditioning control 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 (AIR CONDITIONING CONTROL ASSEMBLY))

(a) Disconnect the I222 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the I37 security indicator light (air conditioning control assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I222-25 (IND) - I37-10 (LP)

Always

Below 1 Ω

I222-25 (IND) or I37-10 (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) Connect the I222 certification ECU (smart key ECU assembly) connector.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

(b) Connect the I37 security indicator light (air conditioning control assembly) connector.

(c) Using an oscilloscope, check the waveform.

Measurement Condition:

Tester Connection

Condition

Specified Condition

I222-25 (IND) - Body ground

Ignition switch off → ON

Pulse generation → Below 2 V
OK

REPLACE SECURITY INDICATOR LIGHT (AIR CONDITIONING CONTROL ASSEMBLY)
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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