Toyota Parking Assist-Sensor System - Clearance Warning Buzzer Circuit
DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
PERFORM ACTIVE TEST USING INTELLIGENT TESTER (NO. 1 CLEARANCE WARNING BUZZER)
CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - NO. 1 CLEARANCE WARNING BUZZER)
CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER)
TOYOTA PARKING ASSIST-SENSOR SYSTEM - Clearance Warning Buzzer Circuit
DESCRIPTION
The No. 1 clearance warning buzzer sounds to alert the driver and the buzzed frequency changes depending on the distance to an obstacle.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (NO. 1 CLEARANCE WARNING BUZZER) |
Select the Active Test, use the intelligent tester to generate a control command, and then check that the buzzer operates ().
Clearance Sonar| Tester Display | Test Part | Control Range | Diagnostic Note |
| Front Buzzer |
No. 1 clearance warning buzzer | Operate or Stop | - |
- OK:
- No. 1 clearance warning buzzer sounds.
Result| Result | Proceed to |
| OK | A |
| NG (w/ Side Monitor System) | B |
| NG (w/o Side Monitor System) | C |
| A | |
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| PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE ()
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| 2.CHECK HARNESS AND CONNECTOR (PARKING ASSIST ECU - NO. 1 CLEARANCE WARNING BUZZER) |
Disconnect the F75 parking assist ECU connector.
Disconnect the E10 No. 1 clearance warning buzzer connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F75-7 (BBZ) - E10-1 (Z+) | Always | Below 1 Ω |
| F75-6 (EF) - E10-2 (Z-) | Always | Below 1 Ω |
| F75-7 (BBZ) - Body ground | Always | 10 kΩ or higher |
| F75-6 (EF) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE NO. 1 CLEARANCE WARNING BUZZER ()
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| 3.CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - NO. 1 CLEARANCE WARNING BUZZER) |
Disconnect the F12 clearance warning ECU connector.
Disconnect the E10 No. 1 clearance warning buzzer connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| F12-10 (BBZ) - E10-1 (Z+) | Always | Below 1 Ω |
| F12-11 (EF) - E10-2 (Z-) | Always | Below 1 Ω |
| F12-10 (BBZ) - Body ground | Always | 10 kΩ or higher |
| F12-11 (EF) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| REPLACE NO. 1 CLEARANCE WARNING BUZZER ()
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