MALFUNCTION DETECTION SOUND ACTIVATED [PARKING SENSOR]

id0903z4829400

Ultrasonic sensor malfunction detection function

Malfunction detection location	Parking sensor buzzer sound pattern
Corner ultrasonic sensor (LH)
Ultrasonic sensor (LH)
Ultrasonic sensor (RH)
Corner ultrasonic sensor (RH)

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	•  Malfunction detection sound activates after ignition is switched ON and the selector lever (AT)/Shift lever (MT) is in the R position.
Possible Causes	•  Ultrasonic sensor, and corner ultrasonic sensor malfunction ―  Dirt, damage (scratch, deformation), or freezing of sensor ―  Connector connection malfunction ―  Sensor malfunction •  Wiring harness malfunction •  Ultrasonic sensor and corner ultrasonic sensor signal malfunction ―  Open circuit or short to ground in wiring harness between parking assist unit terminal E and corner ultrasonic sensor (LH) terminal B ―  Open circuit or short to ground in wiring harness between parking assist unit terminal G and corner ultrasonic sensor (RH) terminal B ―  Open circuit or short to ground in wiring harness between parking assist unit terminal A and ultrasonic sensor (LH) terminal B ―  Open circuit or short to ground in wiring harness between parking assist unit terminal C and ultrasonic sensor (RH) terminal B •  Ultrasonic sensor and corner ultrasonic sensor ground system malfunction ―  Open circuit in wiring harness between parking assist unit terminal F and corner ultrasonic sensor (LH) terminal A ―  Open circuit in wiring harness between parking assist unit terminal F and corner ultrasonic sensor (RH) terminal A ―  Open circuit in wiring harness between parking assist unit terminal B and ultrasonic sensor (LH) terminal A ―  Open circuit in wiring harness between parking assist unit terminal D and ultrasonic sensor (RH) terminal A •  Parking assist unit malfunction

Diagnostic Procedure

Step	Inspection		Action
1	VERIFY ULTRASONIC SENSOR CONDITION •  Visually inspect the ultrasonic sensor condition. •  Is there any dirt, damage (scratch, deformation), and freezing on the sensor?	Yes	If there is any dirt or ice adhesion: •  Remove any dirt or ice and verify if the malfunction recurs. •  If the malfunction recurs, go to the next step. If there is any damage: •  Replace the sensor. (See ULTRASONIC SENSOR REMOVAL/INSTALLATION.)
		No	Go to the next step.
2	INSPECT CONNECTOR CONNECTION CONDITION •  Verify the connector connection conditions of the parking assist unit, ultrasonic sensor short-cord, and ultrasonic sensor. •  Are the connection conditions normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part.
3	INSPECT WIRING HARNESS BETWEEN PARKING ASSIST UNIT AND ULTRASONIC SENSOR FOR OPEN CIRCUIT •  Switch the ignition off. •  Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Disconnect the connectors of the ultrasonic sensor and parking assist unit. •  Inspect for continuity between the following wiring harnesses: ―  Parking assist unit terminal E and corner ultrasonic sensor (LH) terminal B ―  Parking assist unit terminal G and corner ultrasonic sensor (RH) terminal B ―  Parking assist unit terminal A and ultrasonic sensor (LH) terminal B ―  Parking assist unit terminal C and ultrasonic sensor (RH) terminal B ―  Parking assist unit terminal F and corner ultrasonic sensor (LH) terminal A ―  Parking assist unit terminal F and corner ultrasonic sensor (RH) terminal A ―  Parking assist unit terminal B and ultrasonic sensor (LH) terminal A ―  Parking assist unit terminal D and ultrasonic sensor (RH) 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 parking assist unit and ultrasonic sensor. 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.
4	INSPECT WIRING HARNESS BETWEEN PARKING ASSIST UNIT AND ULTRASONIC SENSOR FOR SHORT TO GROUND •  Inspect for continuity between the following wiring harnesses: ―  Parking assist unit terminal E and ground ―  Parking assist unit terminal G and ground ―  Parking assist unit terminal A and ground ―  Parking assist unit terminal C and ground •  Is there continuity?	Yes	•  Refer to the wiring diagram and verify whether or not there is a mid-connector between the parking assist unit and ultrasonic sensor. 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.
5	DETERMINE IF MALFUNCTION CAUSE IS ULTRASONIC SENSOR OR PARKING ASSIST UNIT •  Reconnect all the disconnected connectors. •  Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.) •  Switch the ignition ON (engine off or on). •  Selector lever (AT)/Shift lever (MT) is in the R position. •  Refer to the parking assist unit inspection and verify the generated pulse for each sensor. (See PARKING ASSIST UNIT INSPECTION.) •  Can the generated pulse be verified?	Yes	Replace the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)
		No	Replace the ultrasonic sensor. (See ULTRASONIC SENSOR REMOVAL/INSTALLATION.)