Inspection Procedure

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

INSPECT NAVIGATION ECU

Disconnect the navigation ECU connector N3.

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

Standard resistance

NAVIGATION ECU RESISTANCE

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

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

Standard voltage

NAVIGATION ECU VOLTAGE

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

Fig 1: Identifying Navigation ECU Connector Terminals

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR

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