Toyota RAV4 manuals

Toyota Sienna Service Manual: No. 1 Clearance Warning Buzzer Circuit

DESCRIPTION

The clearance warning ECU receives the ultrasonic sensor signal to sound the front warning buzzer.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

1 INSPECT FRONT BUZZER

INSPECT FRONT BUZZER

  1. Remove the clearance warning ECU with front buzzer.
  2.  Apply the battery voltage to the terminals 1 and 2 of the buzzer, and check that the buzzer sounds.

HINT: The clearance warning buzzer is separately excited, and will not sound unless an alternating voltage is applied.

OK: Operating noise (clicking sounds) can be heard.

2 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - FRONT BUZZER)

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - FRONT BUZZER)

  1. Disconnect the clearance warning ECU connector and front buzzer connector.
  2.  Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

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