Navigation ECU Communication Stop Mode: Procedure
- CHECK FOR OPEN IN CAN BUS WIRE (NAVIGATION ECU BRANCH WIRE)
- Turn the engine switch off.
- Disconnect the display and navigation module display (navigation ECU) connector.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TEXT IN ILLUSTRATION*1 Front view of wire harness connector
(to Navigation ECU) - Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition J50-21 (CANH) - J50-22 (CANL) Engine switch off 54 to 69 Ω
NG → REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (NAVIGATION ECU BRANCH WIRE)
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
Tester Connection Condition Specified Condition J50-10 (GND1) - Body ground Always Below 1 Ω TEXT IN ILLUSTRATION*1 Front view of wire harness connector
(to Navigation ECU) - Measure the voltage according to the value(s) in the table below.
Standard Voltage
Tester Connection Condition Specified Condition J50-1 (+B1) - Body ground Always 11 to 14 V J50-2 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V J50-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)
OK → See step 3
- Measure the resistance according to the value(s) in the table below.
- REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY (NAVIGATION ECU). Refer to REMOVAL