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.

CHECK WIRE HARNESS (INSTRUMENT CLUSTER FINISH PANEL CENTER - NAVIGATION ECU)

Disconnect the M6 panel connector.
Disconnect the N3 ECU connector.

Fig 1: Identifying N3 ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
M6-9 (IVO+) - N3-12 (VOI+)	Below 1 Ω
M6-10 (IVO-) - N3-13 (VOI-)	Below 1 Ω
M6-9 (IVO+) - Body ground	10 kΩ or higher
M6-10 (IVO-) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT INSTRUMENT CLUSTER FINISH PANEL CENTER (MULTI-DISPLAY)

Remove the instrument cluster finish panel center.

Fig 2: Identifying Instrument Cluster Finish Panel Center Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the panel.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
M6-9 (IVO+) - B-21 (IVO+)	Below 1 Ω
M6-10 (IVO-) - B-22 (IVO-)	Below 1 Ω
M6-8 (SLD) - B-20 (SLD)	Below 1 Ω
M6-9 (IVO+) - Body ground	10 kΩ or higher
M6-10 (IVO) - Body ground	10 kΩ or higher
M6-8 (SLD) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE INSTRUMENT CLUSTER FINISH PANEL SUB-ASSEMBLY CENTER

OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE OR DIAGNOSTIC TROUBLE CODE CHART