Toyota Sienna Service Manual: 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)

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)

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

Standard resistance

3 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

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