PARKING ASSIST UNIT INSPECTION

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1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

2. Remove the glove compartment. (See GLOVE COMPARTMENT REMOVAL/INSTALLATION.)

3. Remove the parking assist unit. (See PARKING ASSIST UNIT REMOVAL/INSTALLATION.)

4. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION.)

5. 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.

Terminal Voltage Table (Reference)

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Terminal	Signal name	Connected to	Test condition		Voltage (V)	Inspection item
A	Rear ultrasonic sensor	Rear ultrasonic sensor (LH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Rear ultrasonic sensor (LH) • Related wiring harness
B	Rear ultrasonic sensor GND	Rear ultrasonic sensor (LH)	Under any condition		1.0 or less	• Rear ultrasonic sensor (LH) • Related wiring harness
C	Rear ultrasonic sensor	Rear ultrasonic sensor (RH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Rear ultrasonic sensor (RH) • Related wiring harness
D	Rear ultrasonic sensor GND	Rear ultrasonic sensor (RH)	Under any condition		1.0 or less	• Rear ultrasonic sensor (RH) • Related wiring harness
E	Rear ultrasonic sensor	Rear corner ultrasonic sensor (LH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Rear corner ultrasonic sensor (LH) • Related wiring harness
F	Rear corner ultrasonic sensor GND	Rear corner ultrasonic sensor	Under any condition		1.0 or less	• Rear corner ultrasonic sensor • Related wiring harness
G	Rear ultrasonic sensor	Rear corner ultrasonic sensor (RH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Rear corner ultrasonic sensor (RH) • Related wiring harness
H	—	—	—		—	—
I^*1	Front ultrasonic sensor	Front corner ultrasonic sensor (LH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Front corner ultrasonic sensor (LH) • Related wiring harness
J^*1	Front ultrasonic sensor GND	L.H.D.R.H.D. • Front ultrasonic sensor (LH), (RH) • Front corner ultrasonic sensor (LH), (RH) • Front corner ultrasonic sensor (LH)	Under any condition		1.0 or less	L.H.D.R.H.D. • Front ultrasonic sensor (LH), (RH) • Front corner ultrasonic sensor (LH), (RH) • Related wiring harness • Front corner ultrasonic sensor (LH) • Related wiring harness
K^*1	Front ultrasonic sensor	Front ultrasonic sensor (LH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Front ultrasonic sensor (LH) • Related wiring harness
L^*2	Front ultrasonic sensor GND	Front ultrasonic sensor (LH)	Under any condition		1.0 or less	• Front ultrasonic sensor (LH) • Related wiring harness
M^*1	Front ultrasonic sensor	Front ultrasonic sensor (RH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Front ultrasonic sensor (RH) • Related wiring harness
N^*2	Front ultrasonic sensor GND	Front ultrasonic sensor (RH)	Under any condition		1.0 or less	• Front ultrasonic sensor (RH) • Related wiring harness
O^*1	Front corner ultrasonic sensor	Front corner ultrasonic sensor (RH)	Wave pattern (See Inspection Using an Oscilloscope (reference).)			• Front corner ultrasonic sensor (RH) • Related wiring harness
P^*2	Front corner ultrasonic sensor GND	Front corner ultrasonic sensor (RH)	Under any condition		1.0 or less	• Front corner ultrasonic sensor (RH) • Related wiring harness
Q	GND	Body ground	Under any condition		1.0 or less	• Body ground • Related wiring harness
R	—	—	—		—	—
S	—	—	—		—	—
T	—	—	—		—	—
U	Power supply (IG1)^*3	Ignition relay (IG1_STAB)	Ignition switched ON (engine off or on)		B+	• Ignition relay (IG1_STAB) • Related wiring harness
	Power supply (IG1)^*3	Ignition relay (IG1_STAB)	Ignition switched off or ACC		1.0 or less	• Ignition relay (IG1_STAB) • Related wiring harness
	Power supply (IG1)^*4	IG1 relay	Ignition switched ON (engine off or on)		B+	• C/U IG1 15A fuse • IG1 relay • Related wiring harness
	Power supply (IG1)^*4	IG1 relay	Ignition switched off or ACC		1.0 or less
V	Parking sensor switch	Cluster switch	Ignition switched ON (engine off or on)	Parking sensor switch ON	B+	• Cluster switch • Related wiring harnesses
V	Parking sensor switch	Cluster switch	Ignition switched ON (engine off or on)	Parking sensor switch OFF	1.0 or less	• Cluster switch • Related wiring harnesses
W	Rear parking sensor buzzer	Rear parking sensor buzzer	Ignition switched ON (engine off or on)		B+	• Rear parking sensor buzzer • Related wiring harness
W	Rear parking sensor buzzer	Rear parking sensor buzzer	Ignition switched off or ACC		1.0 or less	• Rear parking sensor buzzer • Related wiring harness
X	Rear parking sensor buzzer GND	Rear parking sensor buzzer	Ignition switched ON (engine off or on)	Buzzer sounding	1.0 or less	• Rear parking sensor buzzer • Related wiring harness
X	Rear parking sensor buzzer GND	Rear parking sensor buzzer	Ignition switched ON (engine off or on)	Buzzer stopped	B+	• Rear parking sensor buzzer • Related wiring harness
Y	Front parking sensor buzzer	Front parking sensor buzzer	Ignition switched ON (engine off or on)		B+	• Front parking sensor buzzer • Related wiring harness
Y	Front parking sensor buzzer	Front parking sensor buzzer	Ignition switched off or ACC		1.0 or less	• Front parking sensor buzzer • Related wiring harness
Z	Front parking sensor buzzer GND	Front parking sensor buzzer	Ignition switched ON (engine off or on)	Buzzer sounding	1.0 or less	• Front parking sensor buzzer • Related wiring harness
Z	Front parking sensor buzzer GND	Front parking sensor buzzer	Ignition switched ON (engine off or on)	Buzzer stopped	B+	• Front parking sensor buzzer • Related wiring harness
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.

*1 :With front ultrasonic sensor

*2 :With front ultrasonic sensor (R.H.D.)

*3 :With i-stop system

*4 :Without i-stop system

Inspection Using an Oscilloscope (reference)

L.H.D.

—: Does not operate

Oscilloscope setting:			Terminal
Ignition	Shift lever position	Vehicle speed	Front corner ultrasonic sensor (LH)	Front ultrasonic sensor (LH)	Front ultrasonic sensor (RH)	Front corner ultrasonic sensor (RH)	Rear corner ultrasonic sensor (LH)	Rear ultrasonic sensor (LH)	Rear ultrasonic sensor (RH)	Rear corner ultrasonic sensor (RH)
ON (engine off or on)	Except R position	0—15 km/h {0—9.3 mph} or less	I—J	K—J	M—J	O—J	—	—	—	—
ON (engine off or on)	R position	0—15 km/h {0—9.3 mph} or less	I—J	—	—	O—J	E—F	A—B	C—D	G—F

R.H.D.

—: Does not operate

Oscilloscope setting:			Terminal
Ignition	Shift lever position	Vehicle speed	Front corner ultrasonic sensor (LH)	Front ultrasonic sensor (LH)	Front ultrasonic sensor (RH)	Front corner ultrasonic sensor (RH)	Rear corner ultrasonic sensor (LH)	Rear ultrasonic sensor (LH)	Rear ultrasonic sensor (RH)	Rear corner ultrasonic sensor (RH)
ON (engine off or on)	Except R position	0—15 km/h {0—9.3 mph} or less	I—J	K—L	M—N	P—O	—	—	—	—
ON (engine off or on)	R position	0—15 km/h {0—9.3 mph} or less	I—J	—	—	P—O	E—F	A—B	C—D	G—F

• Oscilloscope setting:

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

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