Clearance Sonar System - Clearance Warning Ecu Power Source Circuit

Lexus IS250 IS220d GSE20 ALE20 - PARK ASSIST / MONITORING

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

Clearance Sonar System - Clearance Warning Ecu Power Source Circuit. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

INSPECTION PROCEDURE

1.INSPECT FUSE (LH-IG)

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

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)
Clearance Sonar System - Clearance Warning Ecu Power Source Circuit. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the Q37 ECU connector.

Measure the voltage of the wire harness side connector.

  • Standard voltage:
  • Tester ConnectionConditionSpecified Condition
    IG (Q37-8) - Body groundEngine 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)
Clearance Sonar System - Clearance Warning Ecu Power Source Circuit. PARK ASSIST / MONITORING. Lexus IS250 IS220d GSE20 ALE20

Disconnect the Q37 ECU connector.

Measure the resistance of the wire harness side connector.

  • Standard resistance:
  • Tester ConnectionConditionSpecified Condition
    E (Q37-27) - Body groundAlwaysBelow 1 Ω
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE