Inspection Procedure

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT NAVIGATION ECU

Disconnect the navigation ECU connector p2.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
GND - Body ground	Always	Below 1 Ω

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

Standard voltage

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
BU+B - GND	Always	10 to 14 V
ACC - GND	Engine switch on (ACC)	10 to 14 V

Fig 1: Identifying Navigation ECU Connector P2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: Go to step 2

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

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

Disconnect the navigation ECU connector p2 and multi-display connector p1.

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION CHART

Tester Connection	Condition	Specified Condition
GND - GND	Always	Below 1 Ω
ACC - ACC	Always	Below 1 Ω
BU+B - BU+B	Always	Below 1 Ω
GND - Body ground	Always	10 kΩ or higher
ACC - Body ground	Always	10 kΩ or higher
BU+B - Body ground	Always	10 kΩ or higher

Fig 2: Identifying Navigation ECU Connector P2 And Multi-Display Connector P1

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: REPLACE MULTI-DISPLAY