Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.

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

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

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

Standard:

MULTI-DISPLAY CONNECTOR TERMINALS RESISTANCE

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

Fig 1: Disconnecting Multi-Display Connector M5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Disconnecting Multiplex Network Body ECU Connector B5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: Go to next step.

INSPECT MULTIPLEX NETWORK BODY ECU

Reconnect the multiplex network 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:

MULTI-DISPLAY CONNECTOR TERMINALS VOLTAGE

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

Fig 3: Disconnecting Multi-Display Connector M5

NG: GO TO LIGHTING SYSTEM (SEE PROBLEM SYMPTOMS TABLE )
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE