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PARK ASSIST / MONITORING TOYOTA PARKING ASSIST-SENSOR SYSTEM Back Sonar Sensor Circuit
DESCRIPTION
This circuit includes the sensor power supply, sensor ground, and sensor signal wires between the rear clearance warning
ECU assembly and No. 1 ultrasonic sensors. The No. 1 ultrasonic sensors are digital sensors.
WIRING DIAGRAM
1 2 1 24
BI BO BI BOR
3 4 3 6
SI SO SI SOR
5 6 5 22
EI EO EI E2
T2 T3 T1
No. 1 Ultrasonic Sensor No. 1 Ultrasonic Sensor Rear Clearance Warning
(Rear Sensor LH) (Rear Sensor RH) ECU Assembly
PROCEDURE
1.CHECK REAR CLEARANCE WARNING ECU ASSEMBLY
*a
T1
BOR E2
Component with harness connected
*a
(Rear Clearance Warning ECU Assembly)
a. Measure the resistance according to the value(s) in the table below.
Standard Resistance:
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Tester Specified
Condition
Connection Condition
T1-22 (E2) -
Always Below 1 Ω
Body ground
b. Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Switch Specified
Connection Condition Condition
Ignition switch
T1-24 (BOR) - ON, back sonar
7.2 to 8.8 V
T1-22 (E2) or clearance
sonar switch on
Result:
Proceed to
OK
NG
OK
2.CHECK HARNESS AND CONNECTOR (REAR CLEARANCE WARNING ECU ASSEMBLY- REAR
SENSOR RH)
NG
REPLACE REAR CLEARANCE WARNING ECU ASSEMBLY
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>ULTRASONIC SENSOR>REMOVAL
2.CHECK HARNESS AND CONNECTOR (REAR CLEARANCE WARNING ECU ASSEMBLY- REAR SENSOR RH)
a. Disconnect the T1 rear clearance warning ECU assembly connector.
b. Disconnect the T3 No. 1 ultrasonic sensor (rear sensor RH) connector.
c. Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Specified
Condition
Connection Condition
T1-24 (BOR) -
Always Below 1 Ω
T3-1 (BI)
T1-6 (SOR) -
Always Below 1 Ω
T3-3 (SI)
T1-22 (E2) - T3-
Always Below 1 Ω
5 (EI)
T1-24 (BOR) -
Always 10 kΩ or higher
Body ground
T1-6 (SOR) -
Always 10 kΩ or higher
Body ground
T1-22 (E2) -
Always 10 kΩ or higher
Body ground
Result:
Proceed to
OK
NG
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OK
3.CHECK HARNESS AND CONNECTOR (REAR SENSOR RH - REAR SENSOR LH)
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
3.CHECK HARNESS AND CONNECTOR (REAR SENSOR RH - REAR SENSOR LH)
a. Disconnect the T3 No. 1 ultrasonic sensor (rear sensor RH) connector.
b. Disconnect the T2 No. 1 ultrasonic sensor (rear sensor LH) connector.
c. Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Specified
Condition
Connection Condition
T3-2 (BO) - T2-
Always Below 1 Ω
1 (BI)
T3-4 (SO) - T2-
Always Below 1 Ω
3 (SI)
T3-6 (EO) - T2-5
Always Below 1 Ω
(EI)
T3-2 (BO) -
Always 10 kΩ or higher
Body ground
T3-4 (SO) -
Always 10 kΩ or higher
Body ground
T3-6 (EO) -
Always 10 kΩ or higher
Body ground
Result:
Proceed to
OK
NG
OK
4.INSPECT NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
4.INSPECT NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)
a. Remove the No. 1 ultrasonic sensor (rear sensor RH).
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>ULTRASONIC SENSOR>REMOVAL
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b.
SO
EI BO
EO BI
SI
Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Specified
Condition
Connection Condition
1 (BI) - 5 (EI) Always 10 kΩ or higher
1 (BI) - 2 (BO) Always 10 kΩ or higher
3 (SI) - 4 (SO) Always Below 1 Ω
5 (EI) - 6 (EO) Always Below 1 Ω
Result:
Proceed to
OK
NG
OK
5.CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM
NG
REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>ULTRASONIC SENSOR>REMOVAL
5.CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM
a. Check the operation of the TOYOTA parking assist-sensor system.
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR
SYSTEM>OPERATION CHECK
Result:
Result Proceed to
TOYOTA parking assist-sensor
A
system malfunction
TOYOTA parking assist-sensor
B
system normal operation
6.REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR LH)
END
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6.REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR LH)
a. Replace the No. 1 ultrasonic sensor (rear sensor LH).
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>ULTRASONIC SENSOR>REMOVAL
Result:
Proceed to
NEXT
NEXT
7.CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM
7.CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM
a. Check the operation of the TOYOTA parking assist-sensor system.
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR
SYSTEM>OPERATION CHECK
Result:
Result Proceed to
TOYOTA parking assist-sensor
A
system malfunction
TOYOTA parking assist-sensor
B
system normal operation
8.REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)
END (NO. 1 ULTRASONIC SENSOR [REAR SENSOR LH] IS DEFECTIVE)
8.REPLACE NO. 1 ULTRASONIC SENSOR (REAR SENSOR RH)
a. Replace the No. 1 ultrasonic sensor (rear sensor RH).
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>ULTRASONIC SENSOR>REMOVAL
Result:
Proceed to
NEXT
NEXT
9.CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM
9.CHECK TOYOTA PARKING ASSIST-SENSOR SYSTEM
a. Check the operation of the TOYOTA parking assist-sensor system.
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR
SYSTEM>OPERATION CHECK
Result:
Result Proceed to
TOYOTA parking assist-sensor
A
system malfunction
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Result Proceed to
TOYOTA parking assist-sensor
B
system normal operation
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE
Click hereAudio / Visual / Telematics>PARK ASSIST / MONITORING>TOYOTA PARKING ASSIST-SENSOR
SYSTEM>PROBLEM SYMPTOMS TABLE
END (NO. 1 ULTRASONIC SENSOR [REAR SENSOR RH] IS DEFECTIVE)
© 2012 TOYOTA MOTOR CORPORATION. All Rights Reserved.
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