PARKING SENSOR BUZZER DOES NOT ACTIVATE/BUZZER SOUND IS SMALL [PARKING SENSOR SYSTEM]

id0903n7200400

Note

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

Description	PARKING SENSOR BUZZER DOES NOT ACTIVATE/BUZZER SOUND IS SMALL
	• The parking sensor buzzer is not activated even if the parking sensor switch is turned on. (Parking sensor indicator illumination is normal) • The volume of the parking sensor buzzer is small.
Possible Causes	• The volume setting of the buzzer is at minimum or close to minimum. • Front parking sensor buzzer connector or terminal malfunction • Rear parking sensor buzzer connector or terminal malfunction • Parking assist unit connector or terminal malfunction • Short to ground in wiring harness between the following terminals: ? Front parking sensor buzzer terminal B—Parking assist unit terminal Y ? Front parking sensor buzzer terminal A—Parking assist unit terminal Z ? Rear parking sensor buzzer terminal B—Parking assist unit terminal W ? Rear parking sensor buzzer terminal A—Parking assist unit terminal X • Short to power supply in wiring harness between the following terminals: ? Front parking sensor buzzer terminal B—Parking assist unit terminal Y ? Front parking sensor buzzer terminal A—Parking assist unit terminal Z ? Rear parking sensor buzzer terminal B—Parking assist unit terminal W ? Rear parking sensor buzzer terminal A—Parking assist unit terminal X • Open circuit in wiring harness between the following terminals: ? Front parking sensor buzzer terminal B—Parking assist unit terminal Y ? Front parking sensor buzzer terminal A—Parking assist unit terminal Z ? Rear parking sensor buzzer terminal B—Parking assist unit terminal W ? Rear parking sensor buzzer terminal A—Parking assist unit terminal X • Front parking sensor buzzer malfunction • Rear parking sensor buzzer malfunction • Parking assist unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ALL SYSTEM DTCs • Switch the ignition off. • Switch the ignition ON (engine off or on) and wait for 10 s or more. • Perform a CMDTC self-test using the M-MDS. (See DTC INSPECTION [PARKING ASSIST UNIT]).) • Are any DTCs displayed?	Yes	Repair or replace the malfunctioning part according to the applicable DTC troubleshooting. (See DTC TABLE [PARKING ASSIST UNIT].)
1		No	Go to the next step.
2	ADJUST PARKING SENSOR BUZZER VOLUME • Adjust the parking sensor buzzer volume. (See BEEP SOUND ADJUSTMENT.) • Was the malfunction corrected?	Yes	System is normal. (Explain to the customer that the volume setting of the buzzer was not appropriate.)
2		No	Go to the next step.
3	INSPECT FRONT PARKING SENSOR BUZZER CONNECTOR CONDITION • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Disconnect the front parking sensor buzzer connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
3		No	Repair or replace the connector.
4	INSPECT REAR PARKING SENSOR BUZZER CONNECTOR CONDITION • Disconnect the rear parking sensor buzzer connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
4		No	Repair or replace the connector.
5	INSPECT PARKING ASSIST UNIT CONNECTOR CONDITION • Disconnect the parking assist unit connector. • Inspect the connector engagement and connection condition and inspect the terminals for damage, deformation, corrosion, or disconnection. • Is the connector normal?	Yes	Go to the next step.
5		No	Repair or replace the connector.
6	INSPECT PARKING SENSOR BUZZER CIRCUIT FOR SHORT TO GROUND • Verify that the following connectors are disconnected. ? Front parking sensor buzzer ? Rear parking sensor buzzer ? Parking assist unit • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ? Front parking sensor buzzer terminal B ? Front parking sensor buzzer terminal A ? Rear parking sensor buzzer terminal B ? Rear parking sensor buzzer terminal A • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Front parking sensor buzzer terminal B—Parking assist unit terminal Y • Front parking sensor buzzer terminal A—Parking assist unit terminal Z • Rear parking sensor buzzer terminal B—Parking assist unit terminal W • Rear parking sensor buzzer terminal A—Parking assist unit terminal X If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground.
6		No	Go to the next step.
7	INSPECT PARKING SENSOR BUZZER CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the following connectors are disconnected. ? Front parking sensor buzzer ? Rear parking sensor buzzer ? Parking assist unit • Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Switch the ignition ON (engine off or on). • Measure the voltage at the following terminals (wiring harness-side): ? Front parking sensor buzzer terminal B ? Front parking sensor buzzer terminal A ? Rear parking sensor buzzer terminal B ? Rear parking sensor buzzer terminal A • Is the voltage 0 V?	Yes	Go to the next step.
7		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Front parking sensor buzzer terminal B—Parking assist unit terminal Y • Front parking sensor buzzer terminal A—Parking assist unit terminal Z • Rear parking sensor buzzer terminal B—Parking assist unit terminal W • Rear parking sensor buzzer terminal A—Parking assist unit terminal X If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply.
8	INSPECT PARKING SENSOR BUZZER CIRCUIT FOR OPEN CIRCUIT • Switch the ignition off. • Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) • Verify that the following connectors are disconnected. ? Front parking sensor buzzer ? Rear parking sensor buzzer ? Parking assist unit • Inspect for continuity between the following terminals (wiring harness-side): ? Front parking sensor buzzer terminal B—Parking assist unit terminal Y ? Front parking sensor buzzer terminal A—Parking assist unit terminal Z ? Rear parking sensor buzzer terminal B—Parking assist unit terminal W ? Rear parking sensor buzzer terminal A—Parking assist unit terminal X • Is there continuity?	Yes	Go to the next step.
8		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • Front parking sensor buzzer terminal B—Parking assist unit terminal Y • Front parking sensor buzzer terminal A—Parking assist unit terminal Z • Rear parking sensor buzzer terminal B—Parking assist unit terminal W • Rear parking sensor buzzer terminal A—Parking assist unit terminal X If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit.
9	INSPECT FRONT PARKING SENSOR BUZZER • Inspect the front parking sensor buzzer. (See FRONT PARKING SENSOR BUZZER INSPECTION.) • Is the front parking sensor buzzer normal?	Yes	Go to the next step.
9		No	Replace the front parking sensor buzzer. (See FRONT PARKING SENSOR BUZZER REMOVAL/INSTALLATION.)
10	INSPECT REAR PARKING SENSOR BUZZER • Inspect the rear parking sensor buzzer. (See REAR PARKING SENSOR BUZZER INSPECTION.) • Is the rear parking sensor buzzer normal?	Yes	Replace the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
10		No	Replace the rear parking sensor buzzer. (See REAR PARKING SENSOR BUZZER REMOVAL/INSTALLATION.)