Inspection Procedure

WARNING: This page is about a different car, the 2005 Lexus RX 330. 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.

Fig 1: Disconnecting Navigation ECU Connector N3

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Standard:

NAVIGATION ECU CONNECTOR TERMINALS 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:

NAVIGATION ECU CONNECTOR TERMINALS VOLTAGE

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

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE or DIAGNOSTIC TROUBLE CODE CHART )