NO.1 CAR-NAVIGATION SYSTEM DOES NOT START OPERATION. (DISPLAY CHANGES TO BACK.) [CAR-NAVIGATION SYSTEM]

id0903e8910100

1

Car-navigation system does not start operation. (Display screen changes to black.)
POSSIBLE CAUSE
•  Open or short circuit in car-navigation unit (power supply (B+)) wiring harness
•  Open or short circuit in car-navigation unit (power supply (ACC)) wiring harness
•  Open or short circuit in car-navigation unit (GND) wiring harness
•  Melt or damaged power supply (B+, ACC) related fuse.
•  Car-navigation unit malfunction
•  Poor connection of car-navigation unit connector, terminal damage

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Switch the ignition to ACC.
•  Does the car-navigation system start and display map on screen?
Yes
Go to Step 6.
No
Go to the next step.
2
•  Switch the ignition to off.
•  Inspect following fuses.
―  RADIO
―  ROOM
•  Are fuses normal?
Yes
Go to the next step.
No
If the fuse is melted, inspect the wiring harness for short to ground. Repair or replace the wiring harness, then replace the fuse.
Replace with the appropriate standard fuse.
3
•  Inspect the connection of the car-navigation unit connectors (24-pin).
•  Are the car-navigation unit connectors connected securely?
Yes
Go to the next step.
No
Securely connect the car-navigation unit.
4
•  Disconnect the car-navigation unit connectors (24-pin).
•  Map screen is displayed.
•  Are all the pins normal?
Yes
Go to the next step.
No
If the car-navigation unit connector is wrong:
•  Replace the car-navigation unit.
If the wiring harness-side connector is wrong:
•  Repair or replace the pins and/or the connector.
5
•  Switch the ignition to ACC.
•  Measure the following car-navigation unit connector (24-pin) terminals.
―  Terminal B (+B): B+
―  Terminal R (ACC): B+
―  Terminal W (GND): below 1.0V
•  Are voltages normally?
Yes
Go to the next step.
No
Repair or replace malfunctioning wiring harness.
6
•  Switch the ignition to ON.
•  Does the car-navigation system start and display map on screen?
Yes
The system is normal.
No
Replace the car-navigation unit.
(See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.)