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 - BATTERY AND BODY GROUND)

Disconnect the M5 panel connector.

Fig 1: Identifying M5 Panel Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance and voltage of the wire harness side connector.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
M5-11 (GND1) - Body ground	Below 1 Ω

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
M5-10 (+B1)*Body ground	Always	10 to 14 V
M5-12 (ST1) - Body ground	Ignition switch OFF	OV
M5-12 (ST1) - Body ground	Ignition switch START	10 to 14 V
M5-20 (ACC) - Body ground	Ignition switch OFF	OV
M5-20 (ACC) - Body ground	Ignition switch ACC	10 to 14 V

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

CHECK WIRE HARNESS (NAVIGATION ECU - STEREO COMPONENT AMPLIFIER AND BODY GROUND)

Disconnect the M6 panel connector.
Disconnect the A8 A/C connector.

Fig 2: Identifying A8 A/C Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance of the wire harness connectors.

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Specified Condition
M5-3 (OPEN) - A8-14 (EMOP)	Below 1 Ω
MS-13 (TILT) - A8-4 (EMTI)	Below 1 Ω
M5-4 (RE1) - A10-2 (SW1)	Below 1 Ω
M5-14 (RE2) - A10-7 (SW2)	Below 1 Ω
M5-3 (OPEN) - Body ground	10 kΩ or higher
M5-13 (TILT) - Body ground	10 kΩ or higher
M5-3 (RE1) - Body ground	10 kΩ or higher
M5-13 (RE2) - Body ground	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR

OK: Go to next step

INSPECT INSTRUMENT CLUSTER FINISH PANEL SUB-ASSEMBLY CENTER

Remove the instrument cluster finish panel center.

Fig 3: 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
M5-3 (OPEN) - C-8 (OPEN/CLOSE)	Below 1 Ω
M5-13 (TILT) - C-7 (TILT)	Below 1 Ω
M5-4 (RE1) - C-3 (OPEN)	Below 1 Ω
M5-14 (RE2) - C-2 (CLOSE)	Below 1 Ω
M5-12 (ST1) - C-5 (ST1)	Below 1 Ω
M5-20 (ACC) - C-6 (ACC)	Below 1 Ω
M5-11 (GND1) - C-9 (GND1)	Below 1 Ω
M5-10 (+B1) - C-10 (+B1)	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