Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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1
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• Are the switches only partly inoperative?
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Yes
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Replace the car-navigation control switch. (See CAR-NAVIGATION CONTROL SWITCH REMOVAL/INSTALLATION.)
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No
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Go to the next step.
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2
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• Inspect the connection of the car-navigation control switch connector (6-pin).
• Is the connector securely connected?
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Yes
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Go to the next step.
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No
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Securely connect the car-navigation control switch connector (6-pin).
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3
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• 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?
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Yes
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Go to the next step.
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No
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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.
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4
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• Turn the ignition switch to the LOCK position.
• Remove the LCD unit. (See LCD UNIT REMOVAL/INSTALLATION.)
• Inspect the car-navigation unit connector (24-pin).
• Is the connector securely connected?
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Yes
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Go to the next step.
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No
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Securely connect the LCD unit connector.
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5
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• Disconnect the LCD unit 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?
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Yes
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Go to the next step.
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No
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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.
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6
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• Turn the ignition switch to the ACC position.
• Inspect the voltage between the car-navigation control switch harness-side connector (6-pin) terminal A (power) and B (GND).
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Inspect the vehicle side wiring harness (power supply circuit).
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7
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• 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 connector terminal E and the LCD unit connector terminal E.
• Is there continuity?
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Yes
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Replace the car-navigation control switch. (See CAR-NAVIGATION CONTROL SWITCH REMOVAL/INSTALLATION.)
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No
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Repair or replace the wiring harness.
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