Inspection Procedure

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT NAVIGATION ECU

Disconnect the navigation ECU connector.

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
p2-15 (GND1) - Body ground	Always	Below 1 Ω

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

Standard Voltage

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
p2-1 (+B) - p2-15 (GND1)	Always	11 to 14 V
P2-13 (ACC) - p2-15 (GND1)	Engine switch on (ACC)	11 to 14 V

Fig 1: Identifying Terminals Of Navigation ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 2

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

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

Disconnect the navigation ECU connector and multi-display connector

Fig 2: Identifying Terminals Of Navigation ECU Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

Standard Resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
p2-15 (GND1) - p1-6 (GND2)	Always	Below 1 Ω
p2-13 (ACC) - p1-7 (ACC2)	Always	Below 1 Ω
p2-1 (+B) - p1-8 (+B)	Always	Below 1 Ω
p2-15 (GND1) - Body ground	Always	10 kΩ or higher
p2-13 (ACC) - Body ground	Always	10 kΩ or higher
p2-1 (+B) - Body ground	Always	10 kΩ or higher

Fig 3: Identifying Terminals Of Multi-Display Connector

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MULTI-DISPLAY (See REMOVAL )