NO.1 DISPLAY SCREEN DOES NOT OPEN EVEN IF THE IGNITION SWITCH IS TURNED TO THE ACC POSITION.[CAR-NAVIGATION SYSTEM]

id0903e8801700

1
Display screen does not open even if the ignition switch is turned to the ACC position.
POSSIBLE CAUSE
•  Open or short circuit in power supply (B+ or ACC) wiring harness or burnt fuse
•  Open or short circuit in GND wiring harness
•  LCD unit malfunction
•  Poor connection of LCD unit connector, terminal damage
•  Short circuit in car-navigation control switch wiring harness
Caution
•  Forcibly opening/closing, or placing an object on the display screen may cause the display screen to become inoperable.

Diagnostic procedure

STEP

INSPECTION

ACTION
1
•  Turn the ignition switch to the ACC position.
•  Press the OPEN/CLOSE button on the LCD unit.
•  Does the display screen open?
Yes
The system is normal.
Note
•  If the display screen is closed by pressing the OPEN/CLOSE button of the LCD unit with the ignition switch at the ACC position, the display screen will remain closed when the ignition switch is turned to the ACC position again.
No
Go to the next step.
2
•  Turn the ignition switch to the LOCK position.
•  Inspect the following fuses:
―  RADIO 15 A fuse
―  ROOM 15 A fuse
•  Are the fuses damaged?
Yes
Go to the next step.
No
•  Replace with the appropriate standard fuse.
―  If the fuse is melted, inspect the wiring harness for short to ground. Repair or replace the wiring harness, then replace the fuse.
3
•  Remove the car-navigation control switch.
•  Disconnect the car-navigation control switch connector (6-pin).
•  Turn the ignition switch to the ACC position.
•  Inspect the voltage between the car-navigation control switch wiring harness-side connector (6-pin) terminal A (POWER) and B (GND).
•  Is the voltage B+?
Yes
Go to Step 5.
No
Go to the next step.
4
•  Turn the ignition switch to the LOCK position.
•  Inspect the continuity between terminal A (POWER) and B (GND) at the car-navigation control switch wiring harness-side connector.
•  Is there continuity?
Yes
Repair or replace the suspect wiring harness. Replace the LCD unit. (ACC protector circuit inside LCD unit broken.)
No
Go to the next step.
5
•  Remove the LCD unit.
•  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 (24-pin).
6
•  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. (See LCD UNIT REMOVAL/INSTALLATION.)
If the wiring harness-side connector is wrong:
•  Repair or replace the pins and/or the connector.
7
•  Inspect the voltage between LCD unit wiring harness-side connector (24-pin) terminal Q (B+) and P (GND)
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the suspect wiring harness, then repair or replace the wiring harness.
8
•  Turn the ignition switch to the ACC position.
•  Inspect the voltage between LCD unit wiring harness-side connector (24-pin) terminal O (ACC) and P (GND).
•  Is the voltage B+?
Yes
Replace the LCD unit. (See LCD UNIT REMOVAL/INSTALLATION.)
No
Inspect the suspect wiring harness, then repair or replace the wiring harness.