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.

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (STOP LIGHT)

Select the ACTIVE TEST, use the intelligent tester (with CAN VIM) to generate a control command, and then check that the stop light illuminates.

Luggage room junction block ECU

ACTIVE TEST DETAIL - LUGGAGE ROOM JUNCTION BLOCK ECU

Item	Test Details	Diagnostic Note
STOP LIGHT	Stop light ON / OFF	-

OK: stop light illuminates.

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

NG: Go to Next step

INSPECT REAR COMBINATION LIGHT ASSEMBLY (STOP LIGHT)

Fig 1: Identifying Rear Combination Light Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the rear combination light.

Apply battery voltage to the rear combination light connector and check that the stop light illuminates.

MEASUREMENT CONDITION AND SPECIFIED CONDITION

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 3 Battery positive (-) → Terminal 4	Stop light illuminates

NG: REPLACE REAR COMBINATION LIGHT ASSEMBLY

OK: Go to Next step

CHECK WIRE HARNESS (ECU - BATTERY AND BODY GROUND)

Disconnect the 6L junction block connector.

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

Measure the voltage of the wire harness side connectors.

Standard voltage

VOLTAGE SPECIFICATION

Tester Connection	Specified Condition
6L-1 (STOP1) - 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 R6*1 or R7*2 light connector.
HINT:

*1: LH

*2: RH
Disconnect the L23 ECU connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
R6-3 - L23-8 (STP1)	Below 1 Ω
R6-4 - Body ground	Below 1 Ω
R6-3 - Body ground	10 kΩ or higher

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
R7-3 - L23-7 (STP1)	Below 1 Ω
R7-4 - Body ground	Below 1 Ω
R7-3 - Body ground	10 kΩ or higher

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

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

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