Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus RX 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK HARNESS AND CONNECTOR (BODY ECU - MULTI-DISPLAY)

Disconnect the body ECU connector B5 and multi-display connector M5.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester connection	Condition	Specified condition
DR - ACAN	Always	Below 1 Ω
DR - Body ground	Always	10 kΩ or higher

Fig 1: Identifying Body ECU & Multi-Display Connector Terminals

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: Go to Next Step

INSPECT BODY ECU (OUTPUT SIGNAL)

Reconnect the body ECU connector.
Turn the ignition switch to the ON position.
Turn the light control switch to the TAIL or HEAD position.

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION REFERENCE TABLE

Tester connection	Condition	Specified condition
DR - Body ground	Automatic light control sensor is covered.	Above 9 V

Fig 2: Identifying Body ECU Connector Terminals

NG: GO TO LIGHTING SYSTEM

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