No. 2 Clearance Warning Buzzer Circuit

DESCRIPTION

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

WIRING DIAGRAM

INSPECTION PROCEDURE

1 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER AMPLIFIER)

1. 1
   Disconnect the connectors from the clearance warning ECU C9 and air conditioner amplifier connector A10 or A11.
2. 2
   Measure the resistance according to the value(s) in the table below.

Standard resistance

2 INSPECT REAR BUZZER

1. 1
   Remove the integration control & panel assembly with the connectors still connected.
2. 2
   Using a service wire, ground the terminal Z- of the integration control & panel assembly connector.
3. 3
   Turn the ignition switch ON.
4. 4
   Check that the rear 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.

Result

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

3 INSPECT PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY

1. Check that the malfunction disappears when a known good printed wire integration board sub-assembly is installed.

OK: Malfunction disappears.

REPLACE PRINTED WIRE INTEGRATION BOARD SUB-ASSEMBLY

4 INSPECT INTEGRATION PANEL SUB-ASSEMBLY

1. Check that the malfunction disappears when a known good integration panel sub-assembly is installed.

OK: Malfunction disappears

REPLACE INTEGRATION PANEL SUB-ASSEMBLY