Toyota RAV4 manuals

Toyota Sienna Service Manual: No. 2 Clearance Warning Buzzer Circuit

DESCRIPTION

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

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

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

Standard resistance

Standard resistance

2 INSPECT REAR BUZZER

 INSPECT REAR BUZZER

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

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

Clearance Warning ECU Power Source Circuit
DESCRIPTION This circuit provides power to the clearance warning ECU. WIRING DIAGRAM INSPECTION PROCEDURE 1 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - AIR CONDITIONER AMPLIFIER) ...

Indicator Circuit
DESCRIPTION The indicator displays the location of the obstacle and the approximate distance between the vehicle and the obstacle either by blinking or turning on. WIRING DIAGRAM INSPECTION ...

Other materials:

Removal
1. PRECAUTION CAUTION: Be sure to read "PRECAUTION" thoroughly before servicing. 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait for 90 seconds after disconnecting the cable to prevent the airbag working. 3. REMOVE INSTRUMENT PANEL FINISH PANEL SUBASSEMBLY LOWER L ...

Front Fog Light Circuit
DESCRIPTION The Multiplex network body ECU controls FOG relay when signal is received from headlight dimmer switch assembly. WIRING DIAGRAM INSPECTION PROCEDURE 1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER Connect the intelligent tester to DLC3. Turn the ignition switch ON and push t ...

Basic inspection
When a malfunction is not confirmed by the DTC check, troubleshooting should be carried out in all circuits considered to be possible causes of the problem. In many cases, by carrying out the basic engine check shown in the following flowchart, the location of the problem can be found quickly a ...

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