Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM10000000269FW
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 - 11/2022]
Title: DOOR LOCK: KEY REMINDER WARNING SYSTEM: Key Reminder Buzzer does not Sound; 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]

Key Reminder Buzzer does not Sound

DESCRIPTION

The key reminder warning buzzer sounds when the driver door is opened while the ignition switch is off or ACC. The key reminder warning buzzer is activated when the main body ECU (multiplex network body ECU) sends an unlock warning switch signal and driver door courtesy light switch signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

for TMMMS Made

for TMC Made

CAUTION / NOTICE / HINT

NOTICE:

The key reminder warning system uses the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the key reminder warning system after confirming that the communication systems are functioning properly.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; DOOR LOCK: KEY REMINDER WARNING SYSTEM: HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

for TMMMS Made

A

for TMC Made

B

B

GO TO STEP 8

A

2.

PERFORM ACTIVE TEST USING GTS (BUZZER OPERATION)

(a) Connect the GTS to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the GTS on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

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

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Buzzer Operation (800Hz, Vol L, W/ Damping)

Combination meter buzzer

  • Frequency: 800Hz
  • Volume: Large
  • Fading tone

ON

-

Body Electrical > Combination Meter > Active Test

Tester Display

Buzzer Operation (800Hz, Vol L, W/ Damping)

OK:

Combination meter buzzer sounds

NG

REPLACE COMBINATION METER ASSEMBLY

OK

3.

READ VALUE USING GTS (FL DOOR COURTESY SW)

(a) Enter the following menus: Body Electrical / Main Body / Data List.

(b) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FL Door Courtesy SW

Front door courtesy light switch assembly (for LH) signal

OFF or ON

OFF: Front door LH closed

ON: Front door LH open

-

Body Electrical > Main Body > Data List

Tester Display

FR Door Courtesy SW

OK:

The GTS indicates ON or OFF according to the driver door conditions shown in the table.

NG

GO TO LIGHTING SYSTEM

except TMMMS Made: Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; LIGHTING (INT): LIGHTING SYSTEM (except TMMMS Made): HOW TO PROCEED WITH TROUBLESHOOTING

for TMMMS Made: Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; LIGHTING (INT): LIGHTING SYSTEM (for TMMMS Made): HOW TO PROCEED WITH TROUBLESHOOTING

OK

4.

READ VALUE USING GTS (KEY UNLOCK WARNING SW)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Key Unlock Warning SW

Unlock warning switch signal

OFF or ON

OFF: No key in ignition key cylinder

ON: Key in ignition key cylinder

-

Body Electrical > Main Body > Data List

Tester Display

Key Unlock Warning SW

OK:

The GTS indicates ON or OFF according to whether the key is in the ignition key cylinder.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

5.

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

(a) Remove the unlock warning switch assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; DOOR LOCK: UNLOCK WARNING SWITCH: REMOVAL

(b) Inspect the unlock warning switch assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; DOOR LOCK: UNLOCK WARNING SWITCH: INSPECTION

NG

REPLACE UNLOCK WARNING SWITCH ASSEMBLY

OK

6.

CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4E instrument panel junction block assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-41 - I13-1 (UN+)

Always

Below 1 Ω

I13-2 (UN-) - Body ground

Always

Below 1 Ω

I13-1 (UN+) or 4E-41 - Other terminals and body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

(a) Remove the instrument panel junction block assembly.

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

(b) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

4E-41 - MB-3 (KSW)

Always

Below 1 Ω

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

8.

PERFORM ACTIVE TEST USING GTS (BUZZER OPERATION)

(a) Connect the GTS to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the GTS on.

(d) Enter the following menus: Body Electrical / Combination Meter / Active Test.

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

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Buzzer Operation (800Hz, Vol L, W/ Damping)

Combination meter buzzer

  • Frequency: 800Hz
  • Volume: Large
  • Fading tone

ON

-

Body Electrical > Combination Meter > Active Test

Tester Display

Buzzer Operation (800Hz, Vol L, W/ Damping)

OK:

Combination meter buzzer sounds

NG

REPLACE COMBINATION METER ASSEMBLY

OK

9.

READ VALUE USING GTS (FL DOOR COURTESY SWITCH STATUS)

(a) Enter the following menus: Body Electrical / Main Body / Data List.

(b) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

FL Door Courtesy Switch Status

Front door courtesy light switch assembly (for LH) signal

Close or Open

Close: Front door LH closed

Open: Front door LH open

-

Body Electrical > Main Body > Data List

Tester Display

FL Door Courtesy Switch Status

OK:

The GTS indicates ON or OFF according to the driver door conditions shown in the table.

NG

GO TO LIGHTING SYSTEM

except TMMMS Made: Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; LIGHTING (INT): LIGHTING SYSTEM (except TMMMS Made): HOW TO PROCEED WITH TROUBLESHOOTING

for TMMMS Made: Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; LIGHTING (INT): LIGHTING SYSTEM (for TMMMS Made): HOW TO PROCEED WITH TROUBLESHOOTING

OK

10.

READ VALUE USING GTS (KEY UNLOCK WARNING SWITCH)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Main Body > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Key Unlock Warning Switch

Unlock warning switch signal

OFF or ON

OFF: No key in ignition key cylinder

ON: Key in ignition key cylinder

-

Body Electrical > Main Body > Data List

Tester Display

Key Unlock Warning Switch

OK:

The GTS indicates ON or OFF according to whether the key is in the ignition key cylinder.

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

11.

INSPECT UNLOCK WARNING SWITCH ASSEMBLY

(a) Remove the unlock warning switch assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; DOOR LOCK: UNLOCK WARNING SWITCH: REMOVAL

(b) Inspect the unlock warning switch assembly.

Click here 2020 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 -        ]; DOOR LOCK: UNLOCK WARNING SWITCH: INSPECTION

NG

REPLACE UNLOCK WARNING SWITCH ASSEMBLY

OK

12.

CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) AND BODY GROUND)

(a) Disconnect the I85 main body ECU (multiplex network body ECU) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

I85-16 - I13-1 (UN+)

Always

Below 1 Ω

I13-2 (UN-) - Body ground

Always

Below 1 Ω

I13-1 (UN+) or I85-16 - Other terminals and body ground

Always

10 kΩ or higher

OK

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR