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 (BACK-UP LIGHT)

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

Luggage room junction block ECU

ACTIVE TEST DETAIL - LUGGAGE ROOM JUNCTION BLOCK ECU

Item	Test Details	Diagnostic Note
BACK-UP	Back-up light ON / OFF	-

OK: Back-up light illuminates.

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

NG: Go to Next step

INSPECT BACK-UP LIGHT ASSEMBLY

Fig 1: Identifying Back-Up Light Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Remove the back-up light.

Apply battery voltage to the back-up light connector and check that the back-up light illuminates.

MEASUREMENT CONDITION AND SPECIFIED CONDITION

Measurement Condition	Specified Condition
Battery positive (+) → Terminal 2 Battery negative (-) → Terminal 1	Back-up light illuminates

NG: REPLACE BACK-UP 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
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 (BCK1) - 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 B8*1 or B9*2 light connector.
HINT:

*1: LH

*2: RH
Disconnect the L22 ECU connector.

Measure the resistance of the wire harness side connectors.

Standard resistance:

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
B8-2 - L22-13 (BCK1)	Below 1 Ω
B8-1 - Body ground	Below 1 Ω
B8-2 - Body ground	10 kΩ or higher

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
B9-2 - L22-13 (BCK1)	Below 1 Ω
B9-1 - Body ground	Below 1 Ω
B9-2 - Body ground	10 kΩ or higher

Fig 3: Identifying Back-Up 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