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

WARNING: This page is about a different car, the 2011 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.

CHECK OPEN IN CAN BUS WIRE (NAVIGATION ECU BRANCH LINE)

Turn the ignition switch off.
Disconnect the navigation receiver assembly connector.

Fig 1: Identifying Navigation Receiver Assembly Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

Disconnect the navigation receiver assembly connectors.

Fig 2: Identifying Navigation Receiver Assembly Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

REPLACE NAVIGATION RECEIVER ASSEMBLY (NAVIGATION ECU). Refer to REMOVAL