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 (CLEARANCE LIGHT)

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

Front light ECU (Front controller)

ACTIVE TEST DETAIL - FRONT LIGHT ECU (FRONT CONTROLLER)

Item	Test Details	Diagnostic Note
CLEARANCE LIGHT	Clearance light ON / OFF	-

OK: Clearance light illuminates.

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

NG: Go to Next step

INSPECT CLEARANCE LIGHT ASSEMBLY

Remove the clearance light.

Apply battery to the clearance light connector and check that the clearance light illuminates.

Fig 1: Identifying Clearance 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	Clearance light illuminates.

NG: REPLACE CLEARANCE LIGHT ASSEMBLY

OK: Go to Next step

INSPECT RELAY ASSEMBLY (Marking: CRA)

Remove the CRA relay from the engine room No. 2 relay block.

Fig 2: Identifying CRA Relay Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the relay.

Standard resistance

RESISTANCE SPECIFICATION

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (when battery voltage is applied to terminals 1 and 2)

NG: REPLACE RELAY

OK: Go to Next step

CHECK WIRE HARNESS (ECU - BODY GROUND)
1. Remove the front light ECU from the engine room No. 2 relay block.
  
  Fig 3: Identifying Front Light ECU Connector Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Using a service wire, connect the front light ECU terminal 15 (TAIL-RLY) of the engine room No. 2 relay block on the wire harness side and body ground.
3. Check that the clearance light illuminates.
  OK: Clearance light illuminates.
NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

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