Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM1000000028KAE
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [11/2022 -           ]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Power Source Mode does not Change to ON (IG); 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]

Power Source Mode does not Change to ON (IG)

DESCRIPTION

If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.

Related Data List and Active Test Items

Problem Symptom

Data List and Active Test

Power source mode does not change to on (IG) but does change to on (ACC)

Power Source Control

  • Power Supply Condition
  • IGP Relay Circuit (Outside) Monitor
  • IGP Relay Circuit (Inside) Monitor
  • IGR Relay Circuit (Outside) Monitor
  • IGR Relay Circuit (Inside) Monitor

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 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

  • Make sure that no DTCs are output. If any DTCs are output, proceed to Diagnostic Trouble Code Chart.
  • If the smart key system (for Start Function) has been disabled, enable the system before performing troubleshooting.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): CUSTOMIZE PARAMETERS

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • Before replacing the certification ECU (smart key ECU assembly), refer to Registration.

    Click here 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [11/2022 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • After completing repairs, confirm that the problem does not recur.
  • After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation."

HINT:

  • If interior verification is unsuccessful, Vehicle Control History may be stored.
  • If Vehicle Control History has been stored, refer to the Vehicle Control History List to determine the detection conditions and narrow down trouble areas.

Body Electrical > Smart Key > Utility

Tester Display

Vehicle Control History (RoB)

PROCEDURE

1.

CHECK FOR DTC

(a) Using the GTS, check for certification ECU (smart key ECU assembly) DTCs.

Body Electrical > Power Source Control > Trouble Codes

Body Electrical > Smart Key > Trouble Codes

Result

Proceed to

DTCs are not output

A

Smart Key System (for Start Function) DTCs are output

B
B

GO TO DIAGNOSTIC TROUBLE CODE CHART 2023 MY Corolla Corolla Hatchback GR Corolla [11/2022 - 03/2023]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): DIAGNOSTIC TROUBLE CODE CHART 2023 - 2025 MY Corolla Corolla Hatchback GR Corolla [03/2023 -        ]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): DIAGNOSTIC TROUBLE CODE CHART

A

2.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) AND BODY GROUND)

(a) Disconnect the O175 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the 8A and 8D power distribution box assembly connectors.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8D-16 - O175-24 (IGPD)

Always

Below 1 Ω

8D-17 - O175-11 (IGRD)

Always

Below 1 Ω

8A-8 - Body ground

Always

Below 1 Ω

8D-16 or O175-24 (IGPD) - Other terminals and body ground

Always

10 kΩ or higher

8D-17 or O175-11 (IGRD) - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Connect the O175 certification ECU (smart key ECU assembly) connector.

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

O175-11 (IGRD) - Body ground

Ignition switch ACC → Ignition switch ON

1 V or less → 9 V or higher

O175-24 (IGPD) - Body ground

Ignition switch ACC → Ignition switch ON

1 V or less → 9 V or higher
NG

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

OK

4.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - POWER SOURCE)

(a) Disconnect the O175 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the 8A, 8D, 8H and 8K, power distribution box assembly connectors.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

8K-1 - Body ground

Always

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK POWER DISTRIBUTION BOX ASSEMBLY

(a) Remove the power distribution box assembly.

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

(b) Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.

*a

Component without harness connected

(Power Distribution Box Assembly)

-

-

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8D-16 - 8F-11

Always

Below 1 Ω

(d) Connect the auxiliary battery terminal (+) to the 8D-17 terminal.

(e) Connect the auxiliary battery terminal (-) to the 8A-8 terminal.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8K-1 - 8H-33

Auxiliary battery voltage applied between terminals 8D-17 and 8A-8

Below 1 Ω

8K-1 - 8A-34

Auxiliary battery voltage applied between terminals 8D-17 and 8A-8

Below 1 Ω

Result

Proceed to

OK (for M20A-FKS)

A

OK (for G16E-GTS)

B

NG

C
B

GO TO STEP 8

C

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

A

6.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - IGP RELAY)

(a) Remove the IGP-MAIN relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-11 - No. 1 engine room relay block and No. 1 junction block assembly IGP-MAIN relay terminal 2

Always

Below 1 Ω

No. 1 engine room relay block and No. 1 junction block assembly IGP-MAIN relay terminal 1 - Body ground

Always

Below 1 Ω

8F-11 or No. 1 engine room relay block and No. 1 junction block assembly IGP-MAIN relay terminal 2 - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

7.

INSPECT IGP-MAIN RELAY

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

3 - 5

Auxiliary battery voltage applied between terminals 1 and 2

Below 1 Ω

Auxiliary battery voltage not applied between terminals 1 and 2

10 kΩ or higher

*1

IGP-MAIN Relay
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE IGP-MAIN

8.

CHECK HARNESS AND CONNECTOR (POWER DISTRIBUTION BOX ASSEMBLY - NO. 1 INTEGRATION RELAY)

(a) Disconnect the 9A No. 1 integration relay connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

8F-11 - 9A-7

Always

Below 1 Ω

9A-8 - Body ground

Always

Below 1 Ω

8F-11 or 9A-7 - Other terminals and body ground

Always

10 kΩ or higher
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

9.

INSPECT NO. 1 INTEGRATION RELAY

Click here 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; POWER DISTRIBUTION: INTEGRATION RELAY: INSPECTION

OK

REPAIR OR REPLACE HARNESS OR CONNECTOR
NG

REPLACE NO. 1 INTEGRATION RELAY