NO.6 CAR-NAVIGATION CONTROL SWITCH IS INOPERATIVE.

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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 inoperatiove if the following circuit is malfunctioning:
- LCD unit connector (24-pin) I (SI01) -car-navigation unit (24-pin) N (SI01)
- LCD unit connector (24-pin) K (SI02) -car-navigation unit (24-pin) P (SI02)
• When the ignition switch is turned OFF, then ACC position, display screen changes to black.

Diagnostic procedure

STEP

INSPECTION

ACTION

1
• Are the switches only partly inoperative?
Yes
Replace the car-navigation control switch.
No
Go to the next step.
2
• Turn the ignition switch to the LOCK position.
• Remove the car-navigation control switch and 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.
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 car-navigation 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 (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
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 (6-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 the wiring harness is OK, then 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 the ON position.
• Inspect the voltage between the car-navigation control switch wiring harness-side connector terminal B (power) and E (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 the ON position.
• Inspect the voltage between connector (6-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 the wiring harness.
No
Replace LCD unit. (See LCD UNIT REMOVAL/INSTALLATION.)