Navigation ECU Power Source Circuit: Wiring Diagram

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Navigation ECU Power Source Circuit - Wiring Diagram

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT NAVIGATION ECU

Disconnect the navigation ECU connector N3.

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

Resistance

ECU CONNECTOR TERMINAL RESISTANCE SPECIFICATION

Tester connection	Condition	Specified condition
GND1 - Body ground	Always	Below 1 Ω

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

Voltage

ECU CONNECTOR TERMINAL VOLTAGE SPECIFICATION

Tester connection	Condition	Specified condition
+B - GND1	Always	10 to 14 V
ACC - GND1	Ignition SW ACC	10 to 14 V

Fig 2: Identifying Navigation ECU Connector N3

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

OK: RETURN TO THE ORIGINAL INSPECTION FLOW BECAUSE THE CHECK RESULT IS NORMAL