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.

PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3
Turn the engine switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Body / Active Test.

Check the operation

Body (Main Body ECU RH)

DIAGNOSTIC NOTE

Tester Display	Test Part	Control Range	Diagnostic Note
Step Light Operation	Footwell lights	ON/OFF	-

OK: Footwell lights come on.

HINT.

The footwell lights RH and LH share the same power source. If either of the lights does not come on, there may be a problem in the part of the circuit that relates to that light. Therefore, inspect that part of the circuit.

NG: Go to step 2

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

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU RH - BATTERY)

Disconnect the J75 main body ECU RH connector

Measure the voltage according to the value(s) in the table

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
J75-15 (FSPT) - Body ground	Always	11 to 14 V

Fig 1: Identifying J75 Main Body ECU RH Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MAIN BODY ECU RH (COWL SIDE JUNCTION BLOCK RH)