NO.2 DISPLAY SCREEN CHANGES TO BLACK.[CAR-NAVIGATION SYSTEM]

id0903e8801800

2
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
•  Open or short circuit in wiring harness between LCD unit and car-navigation unit
•  Poor connection of car-navigation unit connector, terminal damage
•  Poor connection of LCD unit connector, terminal damage
•  Car-navigation unit malfunction
•  LCD unit malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Turn the ignition switch to the ON position.
•  Does the display screen change from blank to NAVI mode when pressing the joystick of the car-navigation control switch?
Yes
The system is normal.
Note
•  If the “VOICE” button is pressed for approx. 2 s or more, the “DISP OFF” menu appears on the bottom-left side of screen. If “DISP OFF” mode is selected, the LCD unit will not display anything. “DISP OFF” mode is cancelled when the ignition switch is turned to the LOCK position or the joystick of the car-navigation control switch is pressed.
No
Go to the next step.
2
•  Turn the ignition switch to the LOCK position.
•  Remove the car-navigation unit.
•  Inspect the car-navigation unit connector (24-pin).
•  Is the car-navigation unit connector connected securely?
Yes
Go to the next step.
No
Securely connect the car-navigation unit connector (24-pin).
3
•  Disconnect the car-navigation unit connector.
•  Inspect both car-navigation unit connector and wiring harness-side connector for poor connection (such as damaged/pulled-out pins, corrosion).
•  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.
4
•  Inspect the voltage between the car-navigation unit wiring harness-side connector (16-pin) terminals B (B+) and A (GND).
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the suspect wiring harness and repair or replace the wiring harness as necessary.
5
•  Turn the ignition switch to the ACC position.
•  Inspect the voltage between the car-navigation unit wiring harness-side connector (16-pin) terminals D (ACC) and A (GND).
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the suspect wiring harness and repair or replace the wiring harness as necessary.
6
•  Turn the ignition switch to the LOCK position.
•  Remove the LCD unit.
•  Inspect the LCD unit connector (24-pin).
•  Is the LCD unit connector connected securely?
Yes
Go to the next step.
No
Securely connect the LCD unit connector (24-pin).
7
•  Disconnect the LCD unit connector (24-pin).
•  Inspect both LCD unit connector and wiring harness-side connector for poor connection (such as damaged/pulled-out pins, corrosion).
•  Are all the pins normal?
Yes
Go to the next step.
No
If the LCD unit connector is wrong:
•  Replace the LCD unit.
If the wiring harness-side connector is wrong:
•  Repair or replace the pins and/or the connector.
8
•  Inspect the following wiring harnesses between the LCD unit and car-navigation unit.
―  Terminal A (24-pin, B)—terminal T (24-pin, B)
―  Terminal B (24-pin, G)—terminal V (24-pin, G)
―  Terminal C (24-pin, SYNC)—terminal R (24-pin, SYNC)
―  Terminal D (24-pin, R)—terminal X (24-pin, R)
―  Terminal E (24-pin, VGND1)—terminal U (24-pin, VGND1)
•  Is there open or short circuit?
Yes
Go to the next step.
No
Repair or replace the suspect wiring harness.
9
•  Inspect the following wiring harnesses between the LCD unit and car-navigation unit.
―  Terminal I (24-pin, SI01)—terminal N (24-pin, SI01)
―  Terminal K (24-pin, SI02)—terminal P (24-pin, SI02)
•  Is there open or short circuit?
Yes
Replace the LCD unit, then go to the next step.
No
Repair or replace the suspect wiring harness.
10
•  Does system work properly?
Yes
Troubleshooting is completed.
No
Replace the car-navigation unit.