NO.6 CAR-NAVIGATION CONTROL SWITCH IS INOPERATIVE.[CAR-NAVIGATION SYSTEM]

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6
Car-navigation control switch is inoperative.
POSSIBLE CAUSE
•  Car-navigation control switch malfunction
•  Open or short circuit in the wiring harness (remote control signal)
•  Poor connection of the car-navigation control switch connector, terminal damage
•  Poor connection of the LCD unit connector, terminal damage
•   LCD 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
•  Are the switches only partly inoperative?
Yes
Replace the car-navigation control switch. (See CAR-NAVIGATION CONTROL SWITCH REMOVAL/INSTALLATION.)
No
Go to the next step.
2
•  Turn the ignition switch to the LOCK position.
•  Remove the car-navigation control switch.
•  Inspect the connection of the car-navigation control switch connector (6-pin).
•  Is the connector securely connected?
Yes
Go to the next step.
No
Securely connect the car-navigation control switch connector (6-pin).
3
•  Turn the ignition switch to the LOCK position.
•  Disconnect the car-navigation control switch connector (6-pin).
•  Inspect both the car-navigation control switch 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 control switch side connector is wrong:
•  Replace the car-navigation control switch. (See CAR-NAVIGATION CONTROL SWITCH REMOVAL/INSTALLATION.)
If the wiring harness-side connector is wrong:
•  Repair or replace the pins and/or the connector.
4
•  Remove the LCD unit. (See LCD UNIT REMOVAL/INSTALLATION.)
•  Inspect the LCD unit connector (6-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 (6-pin).
•  Inspect both the LCD unit and wiring harness-side connector for poor connection (such as damaged/pulled-out pins, corrosion).
•  Are all the pins normal?
Yes
Connect the LCD unit connector, then go to the next step.
No
If the LCD unit side connector is wrong:
•  Replace 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
•  Turn the ignition switch to the LOCK position.
•  Disconnect the LCD unit connector (6-pin).
•  Disconnect the car-navigation control switch connector (16-pin).
•  Inspect for continuity between car-navigation control switch wiring harness-side connector terminal E and the LCD unit wiring harness-side connector terminal E.
•  Is there continuity?
Yes
Inspect for short circuit in the wiring harness.
If there is a short circuit, repair or replace the suspect wiring harness.
If wiring harness is okay, go to the next step.
No
Repair or replace the suspect wiring harness.
7
•  Connect the LCD unit connector (6-pin).
•  Turn the ignition switch to ON.
•  Inspect the voltage between the car-navigation control switch wiring harness-side connector terminal A (POWER) and B (P.GND).
•  Is the voltage B+?
Yes
Replace the car-navigation control switch.
No
Go to the next step.
8
•  Turn the ignition switch to the LOCK position.
•  Disconnect the LCD unit connector (6-pin).
•  Turn the ignition switch to ON.
•  Inspect the voltage between the car-navigation control switch harness-side connector (16-pin) terminal A (power) and body GND.
•  Is the voltage B+?
Yes
Inspect the car-navigation control switch wiring harness (power supply).
Repair or replace if necessary.
No
Replace the LCD unit.