Clearance Sonar System Clearance Warning Ecu Power Source Circuit

Body Electrical. Lexus Is250, Is220D. Gse20 Ale20
Park Assist Monitoring. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT FUSE (LH-IG)

INSPECT CLEARANCE WARNING ECU (IG TERMINAL VOLTAGE)

CHECK WIRE HARNESS (CLEARANCE WARNING ECU - BODY GROUND)

CLEARANCE SONAR SYSTEM - Clearance Warning ECU Power Source Circuit


DESCRIPTION

This circuit provides power to operate the clearance warning ECU.

WIRING DIAGRAM


Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System.Clearance Sonar System Clearance Warning Ecu Power Source Circuit


INSPECTION PROCEDURE

1.INSPECT FUSE (LH-IG)

  1. Remove the LH-IG fuse from the cowl side junction block LH.

  1. Measure the resistance of the LH-IG fuse.

    Standard resistance:
    Below 1 Ω


NG
REPLACE LH-IG FUSE
OK


2.INSPECT CLEARANCE WARNING ECU (IG TERMINAL VOLTAGE)
Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System.Clearance Sonar System Clearance Warning Ecu Power Source Circuit

  1. Disconnect the Q37 ECU connector.

  1. Measure the voltage of the wire harness side connector.

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    IG (Q37-8) - Body ground
    		Engine switch ON (IG)
    		10 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (CLEARANCE WARNING ECU - BATTERY)
OK


3.CHECK WIRE HARNESS (CLEARANCE WARNING ECU - BODY GROUND)
Lexus Is250, Is220D. Gse20 Ale20.Park Assist Monitoring.Clearance Sonar System.Clearance Sonar System Clearance Warning Ecu Power Source Circuit

  1. Disconnect the Q37 ECU connector.

  1. Measure the resistance of the wire harness side connector.

    Standard resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E (Q37-27) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE