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.

Fig 1: Identifying M6 Panel Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Disconnect the N4 ECU connector.

Measure the resistance of the wire harness side connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
M6-19 (VR) - N4-1 (VR)	Below 1 Ω
M6-23 (SYNC) - N4-8 (SYNC)	Below 1 Ω
M6-20 (R) - N4-2 (R)	Below 1 Ω
M6-21 (G) - N4-7 (G)	Below 1 Ω
M6-22 (B) - N4-3 (B)	Below 1 Ω
M6-24 (VG) - N4-6 (VG)	Below 1 Ω
M6-19 (VR) - Body ground	10 kΩ or higher
M6-23 (SYNC) - Body ground	10 kΩ or higher
M6-20 (R) - Body ground	10 kΩ or higher
M6-21 (G) - Body ground	10 kΩ or higher
M6-22 (B) - Body ground	10 kΩ or higher
M6-24 (VG) - 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
M6-19 (VR) - B-23 (VR)	Below 1 Ω
M6-23 (SYNC) - B-27 (SYNC)	Below 1 Ω
M6-20 (R) - B-24 (R)	Below 1 Ω
M6-21 (G) - B-25 (G)	Below 1 Ω
M6-22 (B) - B-26 (B)	Below 1 Ω
M6-24 (VG) - B-28 (VG)	Below 1 Ω

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

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