Toyota Parking Assist-Sensor System Clearance Sonar Main Switch Circuit

Body Electrical. Camry. Acv40 Gsv40
Park Assist Monitoring. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (ECU IG NO. 2)

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE SONAR MAIN SWITCH)

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE SONAR MAIN SWITCH)

INSPECT CLEARANCE SONAR MAIN SWITCH

TOYOTA PARKING ASSIST-SENSOR SYSTEM - Clearance Sonar Main Switch Circuit


DESCRIPTION

When the clearance sonar main switch is turned on, an on signal is sent to the clearance warning ECU.
The Toyota parking assist-sensor system starts operating when the on signal is input to the clearance warning ECU S17-19 (CBZ) terminal (power source terminal).
If the clearance warning ECU S17-19 (CBZ) terminal is receiving the on signal but the S17-4 (+B) terminal (corner sensor detection range adjusting terminal) does not receive the signal, the Toyota parking assist-sensor system will operate but the detection range of the corner sensors will become narrower.
When the corner sensor detection range becomes narrower, the detection range will not change in the front (approximately 500 mm (19.69 in.)), but will change to approximately 500 mm (19.69 in.) or less around the corner sensors.
When the back sensor detection range switching connector is connected, the clearance warning ECU S17-22 (L8) terminal (back sensor detection range switching terminal) will receive an on signal. As a result, the short detection range will be 500 +/- 50 mm (19.69 +/- 1.97 in.).
When the back sensor detection range switching connector is disconnected, the clearance warning ECU S17-22 (L8) terminal (back sensor detection range switching terminal) will not receive an on signal. As a result, the short detection range for the back sensors will be 700 +/- 70 mm (27.56 +/- 2.76 in.).
In addition, when the back sensor detection range switching connector circuit has an open or short circuit, the clearance warning ECU S17-22 (L8) terminal (back sensor detection range switching terminal) will not receive an on signal. As a result, the short detection range for the back sensors will be 700 +/- 70 mm (27.56 +/- 2.76 in.).

WIRING DIAGRAM


Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Clearance Sonar Main Switch Circuit


INSPECTION PROCEDURE

NOTICE:
  1. When inspecting the vehicle side wire harness for the clearance sonar main switch and clearance warning ECU, proper inspection cannot be done if the back sensor detection range switching connector is disconnected.
  2. Be sure to inspect the vehicle side wire harness for the clearance sonar main switch and clearance warning ECU with the back sensor detection range switching connector connected.
1.INSPECT FUSE (ECU IG NO. 2)

  1. Remove the ECU IG NO. 2 fuse from the main body ECU (instrument panel junction block).

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    ECU IG NO. 2 fuse
    		Always
    		Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE SONAR MAIN SWITCH)


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Clearance Sonar Main Switch Circuit

  1. Disconnect the S17 connector from the clearance warning ECU.

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    S17-4 (+B) - S17-9 (E)
    		Ignition switch ON, Clearance sonar main switch ON
    		11 to 14 V
    S17-19 (CBZ) - S17-9 (E)
    		Ignition switch ON, Clearance sonar main switch ON
    		11 to 14 V
    S17-21 (L8) - S17-9 (E)
    		Ignition switch ON, Clearance sonar main switch ON, Back sensor detection range switching connector connected
    		11 to 14 V


NG
Go to step 3
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (CAMRY_ACV40 X394000005X02PD.html)

3.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - CLEARANCE SONAR MAIN SWITCH)


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Clearance Sonar Main Switch Circuit

  1. Disconnect the S17 connector from the clearance warning ECU.

  1. Disconnect the E66 connector from the clearance sonar main switch.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    S17-4 (+B) - E66-1
    		Always
    		Below 1 Ω
    S17-19 (CBZ) - E66-1
    		Always
    		Below 1 Ω
    S17-21 (L8) - E66-1
    		Back sensor detection range switching connector connected
    		Below 1 Ω
    S17-4 (+B) - Body ground
    		Always
    		10 kΩ or higher
    S17-9 (E) - Body ground
    		Always
    		Below 1 Ω
    S17-19 (CBZ) - Body ground
    		Always
    		10 kΩ or higher
    S17-21 (L8) - Body ground
    		Back sensor detection range switching connector connected
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT CLEARANCE SONAR MAIN SWITCH


    Camry. Acv40 Gsv40.Park Assist Monitoring.Toyota Parking Assist-Sensor System.Toyota Parking Assist-Sensor System Clearance Sonar Main Switch Circuit

  1. Remove the clearance sonar main switch (CAMRY_ACV40 RM000003GR8000X.html).

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E66-1 - E66-3
    		Clearance sonar main switch OFF
    		10 kΩ or higher
    E66-1 - E66-3
    		Clearance sonar main switch ON
    		Below 1 Ω


NG
REPLACE CLEARANCE SONAR MAIN SWITCH (CAMRY_ACV40 RM000003GR8000X.html)
OK

REPAIR OR REPLACE HARNESS OR CONNECTOR