NO DETECTION SOUND/LOW VOLUME [PARKING SENSOR]

id0903z4829500

Note

•  If there is any vehicle malfunction complaint lodged by a customer, perform FOREWORD [PARKING SENSOR] malfunction diagnosis according to the troubleshooting procedure. (See FOREWORD [PARKING SENSOR].)

Description	The volume of the detection sound from the buzzer decreases/the detection sound does not activate.
Possible Causes	•  Volume adjustment of buzzer is at minimum •  Buzzer circuit malfunction ―  Open or short circuit in wiring harness between parking sensor control module terminal R and parking sensor buzzer terminal B ―  Open circuit in wiring harness between parking sensor control module terminal T and parking sensor buzzer terminal A •  Parking sensor buzzer malfunction •  Parking sensor control module malfunction

Diagnostic Procedure

Step	Inspection		Action
1	ADJUST BUZZER VOLUME •  Adjust the buzzer volume. (See BEEP SOUND ADJUSTMENT.) •  Was the malfunction corrected?	Yes	Inspection completed (buzzer volume adjustment malfunction).
		No	Go to the next step.
2	INSPECT WIRING HARNESS BETWEEN PARKING SENSOR CONTROL MODULE AND PARKING SENSOR BUZZER FOR OPEN CIRCUIT •  Switch the ignition off. •  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.) •  Disconnect the connectors of the parking sensor buzzer and parking sensor control module. •  Inspect for continuity between the following wiring harnesses: ―  Parking sensor control module terminal R and parking sensor buzzer terminal B ―  Parking sensor control module terminal T and parking sensor buzzer terminal A •  Is there continuity?	Yes	Go to the next step.
		No	•  Refer to the wiring diagram and verify whether or not there is a mid-connector between the following wiring harnesses: ―  Parking sensor control module terminal R and parking sensor buzzer terminal B ―  Parking sensor control module terminal T and parking sensor buzzer terminal A If there is a mid-connector ―  Determine the malfunctioning part by inspecting the mid-connector and the terminal for corrosion, damage, or pin disconnection, and the mid-wiring harness for a open circuit. ―  Repair or replace the wiring harness which has a malfunction. If there is no mid-connector ―  Repair or replace the wiring harness which has a malfunction.
3	INSPECT WIRING HARNESS BETWEEN PARKING SENSOR CONTROL MODULE AND PARKING SENSOR BUZZER FOR SHORT TO GROUND •  Inspect for continuity between the following wiring harnesses: ―  Parking sensor control module terminal R and parking sensor buzzer terminal B •  Is there continuity?	Yes	•  Refer to the wiring diagram and verify whether or not there is a mid-connector between the following wiring harnesses: ―  Parking sensor control module terminal R and parking sensor buzzer terminal B ―  Parking sensor control module terminal T and parking sensor buzzer terminal A If there is a mid-connector ―  Determine the malfunctioning part by inspecting the mid-connector and the terminal for corrosion, damage, or pin disconnection, and the mid-wiring harness for a short to ground. ―  Repair or replace the wiring harness which has a malfunction. If there is no mid-connector ―  Repair or replace the wiring harness which has a malfunction.
		No	Go to the next step.
4	DETERMINE IF MALFUNCTION CAUSE IS PARKING SENSOR BUZZER OR PARKING SENSOR CONTROL MODULE •  Inspect the parking sensor buzzer. (See PARKING SENSOR BUZZER INSPECTION.) •  Is the parking sensor buzzer normal?	Yes	Replace the parking sensor control module. (See PARKING SENSOR CONTROL MODULE REMOVAL/INSTALLATION.)
		No	Replace the parking sensor buzzer. (See PARKING SENSOR BUZZER REMOVAL/INSTALLATION.)