Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

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

RESISTANCE SPECIFICATION

Tester Item	Condition	Specified Condition
LH-IG fuse	Always	Below 1 Ω

NG: REPLACE FUSE (LH-IG)

OK: Go to next step

CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU - BATTERY)

Disconnect the clearance warning ECU connector.

Measure the voltage according to the value (s) on the table below.

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
Q37-8 (IG) - Body ground	Engine switch on (IG)	11 to 14 V

Fig 1: Identifying Q37 Connector Terminals

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to next step

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

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

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

Fig 2: Identifying Q37 Connector Terminal E

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )