NO.8 DISPLAY SCREEN DOES NOT CHANGE TO THE NIGHT MODE. (FRONT AND REAR COMBINATION LIGHTS OPERATE NORMALLY.)[CAR-NAVIGATION SYSTEM]

id0903e8802400

8
Display screen does not change to the night mode. (Front and rear combination lights operate normally.)
POSSIBLE CAUSE
•  Improper setting of NAVI map indication
•  Open or short circuit in TNS signal wiring harness (TNS signal related)
•  LCD unit malfunction
•  Poor connection of the LCD unit connector, terminal damage
•  car-navigation unit malfunction
Note
•  The car-navigation control switch is inoperative if the following circuit has malfunction
―  LCD unit connector (24-pin) terminal I (SI01)—car-navigation unit connector (24-pin) terminal N (SI01)
―  LCD unit connector (24-pin) terminal K (SI02)—car-navigation unit connector (24-pin) terminal P (SI02)
•  If the ignition switch is turned to OFF, then ACC position while above circuits are malfunctioning, display screen changes to black

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Turn the ignition switch to the ACC position.
•  Does the display screen change to the night mode when the light switch is turned to the TNS position, and the dimmer cancel switch is turned to OFF?
Yes
The system is normal.
No
Go to the next step.
2
•  Press the “MENU” button.
•  Select “Navigation Set Up”.
•  Select “User Setting”.
•  Inspect “MAP Mode”.
•  Is the “MAP Mode” set to “Auto”?.
Yes
Go to the next step.
No
System is normal.
Set the “MAP Mode” to “Auto”.
3
•  Start the diagnostic function.
•  Turn the light switch to TNS position.
•  Inspect the "TNS" on the diagnosis check screen.
•  Does the "TNS" indicate "ON"?
Yes
Replace the car-navigation unit. (See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.)
No
Go to the next step.
4
•  Turn the ignition switch to the LOCK position.
•  Remove the LCD unit. (See LCD UNIT REMOVAL/INSTALLATION.)
•  Inspect the connection of the LCD unit connector (24-pin).
•  Is the connector securely connected?
Yes
Go to the next step.
No
Securely connect the LCD unit connector.
5
•  Disconnect the LCD unit connector (24-pin).
•  Inspect both the LCD unit and wiring harness-side connector terminal V 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 side connector is wrong
•  Replace the LCD unit. (See LCD UNIT REMOVAL/INSTALLATION.)
If the wiring harness-side connector is wrong
•  Repair or replace the pins and/or the connector.
6
•  Inspect the voltage of the LCD unit wiring harness-side connector (24-pin) terminal V (TNS signal).
•  Is voltage B+ when the light switch is turned to the TNS position?
Yes
Replace the LCD unit, then go to the next step. (See LCD UNIT REMOVAL/INSTALLATION.)
No
Inspect for TNS signal circuit.
Repair or replace if necessary.
7
•  Does system work properly?
Yes
Troubleshooting is completed.
No
Replace the car-navigation unit.