PARKING ASSIST UNIT INSPECTION

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1.  Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

2.  Remove the following parts:

1.  Front scuff plate (RH) (See FRONT SCUFF PLATE REMOVAL/INSTALLATION.)

2.  Front side trim (RH) (See FRONT SIDE TRIM REMOVAL/INSTALLATION.)

3.  Bonnet release lever (See BONNET RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION.)

4.  Fuel-filler lid opener lever (See FUEL-FILLER LID OPENER AND LEVER REMOVAL/INSTALLATION.)

5.  Driver-side lower panel (See DRIVER-SIDE LOWER PANEL REMOVAL/INSTALLATION.)

3.  Connect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION.)

4.  Verify that the voltages of each of the terminals are as indicated in the terminal voltage table (reference).

•  If the voltage is not as specified in the terminal voltage table (reference), inspect the parts under Inspection item(s) and related wiring harnesses.

―  If the system does not operate normally even though the inspection items are normal, replace the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)

Terminal Voltage Table (Reference)

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Terminal	Signal name	Connected to	Test condition		Voltage (V)	Inspection item
A	Ultrasonic sensor	Rear ultrasonic sensor (LH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			Rear ultrasonic sensor (LH)
B	Ultrasonic sensor GND	Rear ultrasonic sensor (LH)	Under any condition		1.0 or less	Rear ultrasonic sensor (LH)
C	Ultrasonic sensor	Rear ultrasonic sensor (RH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			Rear ultrasonic sensor (RH)
D	Ultrasonic sensor GND	Rear ultrasonic sensor (RH)	Under any condition		1.0 or less	Rear ultrasonic sensor (RH)
E	Ultrasonic sensor	Rear corner ultrasonic sensor (LH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			Rear corner ultrasonic sensor (LH)
F	Ultrasonic sensor GND	Rear corner ultrasonic sensor (LH), (RH)	Under any condition		1.0 or less	Rear corner ultrasonic sensor (LH), (RH)
G	Ultrasonic sensor	Rear corner ultrasonic sensor (RH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			Rear corner ultrasonic sensor (RH)
H	—	—	—		—	—
I	—	—	—		—	—
J	—	—	—		—	—
K	—	—	—		—	—
L	—	—	—		—	—
M	—	—	—		—	—
N	—	—	—		—	—
O	—	—	—		—	—
P	—	—	—		—	—
Q	GND	Body ground	Under any condition		1.0 or less	Body ground
R	—	—	—		—	—
S	Parking sensor indicator	Parking sensor switch	Ignition switched ON (engine off or on)	Parking sensor switch ON (indicator on)	1.0 or less	Parking sensor switch
				Parking sensor switch OFF (indicator off)	B+
T	—	—	—		—	—
U	IG1*1	Ignition relay (IG1_STAB)	Ignition switched ON (engine off or on)		B+	•  Ignition relay (IG1_STAB) •  METER2 7.5A fuse
			Ignition switched off or ACC		1.0 or less
	IG1*2	IG1 relay	Ignition switched ON (engine off or on)		B+	•  C/U IG1 15A fuse •  IG1 relay
			Ignition switched off or ACC		1.0 or less
V	Parking sensor switch	Parking sensor switch	Ignition switched ON (engine off or on)	Parking sensor switch ON (indicator on)	1.0 or less	Parking sensor switch
				Parking sensor switch OFF (indicator off)	B+
W	—	—	—		—	—
X	—	—	—		—	—
Y	Parking sensor buzzer	Parking sensor buzzer	Ignition switched ON (engine off or on)		B+	Parking sensor buzzer
			Ignition switched off or ACC		1.0 or less
Z	Parking sensor buzzer GND	Parking sensor buzzer	Ignition switched ON (engine off or on) and parking sensor switch ON	Buzzer sounding	1.0 or less	Parking sensor buzzer
				Buzzer stopped	B+
AA	CAN_H	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.
AB	CAN_L	CAN system related module	Terminal used for communication therefore determination based on terminal voltage is not possible.

Inspection Using an Oscilloscope (reference)

Oscilloscope setting:			Terminal
Ignition	Shift lever position	Vehicle speed	Corner ultrasonic sensor (LH)	Ultrasonic sensor (LH)	Ultrasonic sensor (RH)	Corner ultrasonic sensor (RH)
ON (engine off or on)	R position	0—15 km/h {0—9.3 mph} or less	E—F	A—B	C—D	G—F

―   2 V/DIV (Y), 20 ms/DIV (X), DC range

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