Clearance Sonar System No. 1 Clearance Warning Buzzer Circuit

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST BY INTELLIGENT TESTER

CHECK WIRE HARNESS (NO. 1 CLEARANCE WARNING BUZZER - CLEARANCE WARNING ECU)

CHECK NO. 1 CLEARANCE WARNING BUZZER (TERMINAL VOLTAGE)

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Connect the intelligent tester to the DLC3.
   

2. Turn the engine switch on (IG).
   

3. Turn the intelligent tester main switch ON.
   

4. Turn the clearance sonar main switch ON.
   

5. Select the Active Test, use the intelligent tester to generate a control command, and then check that the buzzer operates.
   
   

   Clearance warning ECU:

   Item	Vehicle Condition / Test Details	Diagnostic Note
   Front Buzzer	Front buzzer (Clearance warning buzzer) / STOP or OPERATE	-

   OK:

   No. 1 clearance warning buzzer sounds.
   

1. Disconnect the A40 ECU connector.
   

2. Disconnect the L32 buzzer connector.
   

3. Measure the resistance of the wire harness side connectors.
   

   Standard resistance:

   Tester Connection	Condition	Specified Condition
   A40-9 (CBZ) - L32-2	Always	Below 1 Ω
   A40-9 (CBZ) - Body ground	Always	1 MΩ or higher

1. Disconnect the L32 buzzer connector.
   

2. Measure the voltage of the wire harness side connector.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   L32-1 - Body ground	Engine switch on (IG)	10 to 14 V