Navigation ECU Communication Stop Mode (FROM 12/2010): Procedure

1. Turn the ignition switch off.
2. Disconnect the navigation receiver assembly connector.
   Fig 1: Identifying Navigation Receiver Assembly Connector

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

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   E54-2 (CANH) - E54-3 (CANL)	Ignition switch off	54 to 69 Ω

NG → REPAIR OR REPLACE NAVIGATION ECU SUB BUS LINE OR CONNECTOR 

OK: Go to next step 

1. Disconnect the navigation receiver assembly connectors.
   Fig 2: Identifying Navigation Receiver Assembly Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   E52-20 (GND) - Body ground	Always	Below 1 Ω

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

   Standard voltage

   Tester Connection	Condition	Specified Condition
   E52-11 (ACC) - Body ground	Ignition switch ACC	11 to 14 V
   E39-2 (IG) - Body ground	Ignition switch ON	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK → See step   3