DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE USING INTELLIGENT TESTER (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY)
INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY
CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - PARKING ASSIST ECU AND BATTERY)
CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - CLEARANCE WARNING ECU ASSEMBLY AND BATTERY)
TOYOTA PARKING ASSIST-SENSOR SYSTEM - Clearance Sonar Main Switch Circuit
DESCRIPTION
When the back sonar or clearance sonar switch assembly turns on, the ON signal is input into the parking assist ECU*1 or clearance warning ECU assembly*2.
*1: w/ Side Monitor System
*2: w/o Side Monitor System
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE USING INTELLIGENT TESTER (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY) |
Check the Data List for proper functioning of the back sonar or clearance sonar main switch assembly ().
Clearance Sonar| Tester Display | Measurement Item/Range | Normal Condition | Diagnostic Note |
| Main Switch | Back sonar or clearance sonar switch assembly / ON or OFF | OFF: Back sonar or clearance sonar switch assembly off
ON: Back sonar or clearance sonar switch assembly on | - |
- OK:
- The intelligent tester display changes according to operation of back sonar or clearance sonar switch assembly.
| OK | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 2.INSPECT BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY |
Remove the back sonar or clearance sonar switch assembly ().
Inspect the back sonar or clearance sonar switch assembly ().
Result| Result | Proceed to |
| OK (w/ Side Monitor System) | A |
| OK (w/o Side Monitor System) | B |
| NG | C |
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| | REPLACE BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY ()
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| 3.CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - PARKING ASSIST ECU AND BATTERY) |
Disconnect the G15 back sonar or clearance sonar switch assembly connector.
Disconnect the F76 parking assist ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| G15-6 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
| Engine switch off | Below 1 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| G15-9 (ECU) - F76-25 (CSSW) | Always | Below 1 Ω |
| G15-9 (ECU) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE PARKING ASSIST ECU ()
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| 4.CHECK HARNESS AND CONNECTOR (BACK SONAR OR CLEARANCE SONAR SWITCH ASSEMBLY - CLEARANCE WARNING ECU ASSEMBLY AND BATTERY) |
Disconnect the G15 back sonar or clearance sonar switch assembly connector.
Disconnect the F12 clearance warning ECU assembly connector.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Switch Condition | Specified Condition |
| G15-6 (IG) - Body ground | Engine switch on (IG) | 11 to 14 V |
| Engine switch off | Below 1 V |
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| G15-9 (ECU) - F12-12 (CSSW) | Always | Below 1 Ω |
| G15-9 (ECU) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE CLEARANCE WARNING ECU ASSEMBLY ()
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