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.

CHECK PERSONAL LIGHT (OPERATION)
HINT.

The personal lights and shift illumination share the same power source circuit Therefore, if none of them come on, inspect the power source circuit first.
1. Push the switches for the personal lights.
2. Check that the personal lights come on
  OK: Personal lights come on.
NG: Go to step 5

OK: Go to next step

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 No 3 / Active Test

Check the operation.

Body No. 3 (Main Body ECU LH)

DIAGNOSTIC NOTE

Tester Display	Test Part	Control Range	Diagnostic Note
Shift Light Operation	Shift illumination	ON/OFF	-

OK: The shift illumination comes on.

NG: Go to step 3

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

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD JUNCTION BLOCK)

Disconnect the Q1 main body ECU LH connector.

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
Q1-3 (RCTY) - Body ground	Always	11 to 14 V

Fig 1: Identifying Q1 Main Body ECU LH Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 4

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

CHECK HARNESS AND CONNECTOR (MAIN BODY ECU LH - OVERHEAD JUNCTION BLOCK)

Disconnect the Q1 main body ECU LH connector
Disconnect the R5 overhead junction block connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
Q1-3 (RCTY) - R5-14 (SHFT)	Always	Below 1 Ω
Q1-3 (RCTY) - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Harness And Connector (Main Body ECU LH - Overhead Junction Block)

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE OVERHEAD JUNCTION BLOCK (See PERSONAL LIGHT )

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

Disconnect the R5 overhead junction block connector

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
R5-1 (+B1) - Body ground	Always	11 to 14 V

Fig 3: Identifying R5 Overhead Junction Block Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE OVERHEAD JUNCTION BLOCK (See PERSONAL LIGHT )