Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT REAR SIDE MARKER LIGHT ASSEMBLY

Remove the rear side marker light.

Apply battery voltage to the rear side marker light connector and check that the rear side marker illuminates.

Fig 1: Identifying Rear Side Marker Light Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

MEASUREMENT CONDITION AND SPECIFIED CONDITION

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1	Rear side marker light illuminates

NG: REPLACE REAR SIDE MARKER LIGHT ASSEMBLY

OK: Go to Next step

CHECK WIRE HARNESS (ECU - BATTERY)

Disconnect the 6L junction block connector.

Fig 2: Identifying 6L Junction Block Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the voltage of the wire harness side connector.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
6L-1 (TAIL2) - Body ground	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to Next step

CHECK WIRE HARNESS (LIGHT - ECU AND BODY GROUND)

Disconnect the R8*1 or R9*2 light connector.
HINT:

*1: LH

*2: RH
Disconnect the L23 ECU connector.

Measure the resistance of the wire harness side connectors.

Fig 3: Identifying Rear Side Marker Light And Luggage Room Junction Block ECU Connector Terminals

Standard resistance:

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
R8-2 - L23-2 (TIL2)	Below 1 Ω
R8-1 - Body ground	Below 1 Ω
R8-2 - Body ground	10 kΩ or higher

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
R9-2 - L23-1 (TIL2)	Below 1 Ω
R9-1 - Body ground	Below 1 Ω
R9-2 - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

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