Toyota RAV4 manuals

Toyota Sienna Service Manual: Clearance Warning ECU Power Source Circuit

DESCRIPTION

This circuit provides power to the clearance warning ECU.

WIRING DIAGRAM

WIRING DIAGRAM

INSPECTION PROCEDURE

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

CHECK HARNESS AND CONNECTOR

  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

2 CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BODY GROUND)

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BODY GROUND)

  1. Measure the resistance according to the value(s) in the table below.

Standard resistance

Standard resistance

3 INSPECT CLEARANCE WARNING ECU

INSPECT CLEARANCE WARNING ECU

  1. Disconnect the clearance warning ECU connector.
  2.  Turn the ignition switch ON.
  3.  Turn the clearance sonar main switch ON.
  4.  Measure the voltage between terminals +B and E of the ECU.

Standard voltage: 10 to 14 V

Result

Result

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

4 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

5 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

No. 1 Clearance Warning Buzzer Circuit
DESCRIPTION The clearance warning ECU receives the ultrasonic sensor signal to sound the front warning buzzer. WIRING DIAGRAM INSPECTION PROCEDURE 1 INSPECT FRONT BUZZER Remove the c ...

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 WAR ...

Other materials:

Installation
HINT:  Use the same procedures for the RH side and LH side.  The procedures listed below are for the LH side. 1. INSTALL CURTAIN SHIELD AIRBAG ASSEMBLY LH  Install the curtain shield airbag assembly LH with the 13 bolts in the order shown in the illustration. Tor ...

Terminals of ECU
1. FOLD SEAT CONTROL ECU LH Disconnect the fold seat control ECU connectors. Measure the voltage and resistance of the wire harness side connectors. If the result is not as specified, there may be a malfunction on the wire harness side.  Reconnect the fold seat control E ...

Removal
HINT: Use the same procedures for the RH side and LH side.  The procedures listed below are for the LH side. 1. PRECAUTION CAUTION: Be sure to read "PRECAUTION" thoroughly before servicing. 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait for 90 seconds ...

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