No. 1 Clearance Warning Buzzer Circuit [11/2023 - ]: Procedure
WARNING: This page is about a different car, the 2025 Toyota Highlander and 2024 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
- PERFORM ACTIVE TEST USING GTS (FRONT BUZZER)
- Enter the following menus: Body Electrical / Clearance Warning / Active Test.
- Check that the buzzer operates by performing the Active Test.
Body Electrical > Clearance Warning > Active Test
Tester Display Measurement Item Control Range Diagnostic Note Front Buzzer No. 1 clearance warning buzzer OFF or ON Confirm that the vehicle is stopped and the ignition switch is ON Body Electrical > Clearance Warning > Active Test
Tester Display Front Buzzer OK
The No. 1 clearance warning buzzer sounds.
Result
Proceed to OK NG
Result:
OK
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [11/2023 - ]
Result:
NG
See step 2
- CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER)
- Disconnect the H46 clearance warning ECU assembly connector.
- Disconnect the H47 No. 1 clearance warning buzzer connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition H46-9 (CBZ) - H47-1 (Z+) Always Below 1 Ω H46-8 (EF) - H47-2 (Z-) Always Below 1 Ω H46-9 (CBZ) or H47-1 (Z+) - Body ground Always 10 kΩ or higher H46-8 (EF) or H47-2 (Z-) - Body ground Always 10 kΩ or higher Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
Result:
OK
See step 3
- REPLACE NO. 1 CLEARANCE WARNING BUZZER
- Replace the No. 1 clearance warning buzzer with a new or known good one.
Refer to REMOVAL [10/2022 - ]
Result
Proceed to NEXT
Result:
NEXT
See step 4
- Replace the No. 1 clearance warning buzzer with a new or known good one.
- PERFORM ACTIVE TEST USING GTS (FRONT BUZZER)
- Enter the following menus: Body Electrical / Clearance Warning / Active Test.
- Check that the buzzer operates by performing the Active Test.
Body Electrical > Clearance Warning > Active Test
Tester Display Measurement Item Control Range Diagnostic Note Front Buzzer No. 1 clearance warning buzzer OFF or ON Confirm that the vehicle is stopped and the ignition switch is ON Body Electrical > Clearance Warning > Active Test
Tester Display Front Buzzer OK
The No. 1 clearance warning buzzer sounds.
Result
Proceed to OK NG
Result:
OK
END (NO. 1 CLEARANCE WARNING BUZZER WAS DEFECTIVE)
Result:
NG
REPLACE CLEARANCE WARNING ECU ASSEMBLY. Refer to REMOVAL [11/2023 - ]