CAR-NAVIGATION SYSTEM DOES NOT START OPERATION [CAR-NAVIGATION SYSTEM]
id0903e8100000
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Possible DTC |
Even if the NAVI mode is selected, the car-navigation system screen does not display. |
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POSSIBLE CAUSE
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• NAVI switch malfunction
• Power supply fuse (+B, ACC) burnt out
• Open or short circuit in power supply (+B, ACC, GND) wiring harness
• Open or short circuit in power supply (+B, ACC, GND) wiring harness
• Open or short circuit in wiring harness between audio unit and car-navigation unit communication system
• Car-navigation unit malfunction
• Audio unit malfunction
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Diagnostic Procedure
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Step |
Inspection |
Action |
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1
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VERIFY MALFUNCTION SYMPTOM
• Switch the ignition ON (engine off or on).
• Turn the audio unit power supply on and select the NAVI mode.
• Does the car-navigation system launch and the map screen display?
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Yes
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Go to Step 6.
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No
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Go to the next step.
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2
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DETERMINE IF MALFUNCTION CAUSE IS SWITCH
• Operate switches other than the NAVI switch.
• Do the modes other than the NAVI mode switch normally?
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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 switch referring to the switch inspection procedure of the diagnostic assist function.
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3
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INSPECT CAR-NAVIGATION UNIT POWER SUPPLY
• Switch the ignition to ACC.
• Measure the voltage at the following terminals:
• Is the voltage value the battery voltage?
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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 AUDIO1 15 A or AUDIO2 7.5 A fuse.
If the fuse is burned out:
• Inspect for a short to ground in the wiring harness between the AUDIO1 15A fuse and car- navigation unit terminal 1H, or the AUDIO2 7.5 A fuse and car-navigation unit terminal 1G, and perform repairs.
If the fuse is not damaged or burned out:
• Inspect for an open circuit in the wiring harness between the battery and car-navigation unit terminal 1H or 1G.
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4
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INSPECT CAR-NAVIGATION UNIT GROUND
• Switch the ignition off (LOCK).
• Disconnect the audio unit connector.
• Verify the continuity between ground and the following terminal connectors 1A, 1B, 1C, and 1D on the wiring harness side.
• Is there continuity?
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Yes
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Go to the next step.
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No
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Inspect and repair the ground point for looseness, disengagement, or lifting. Inspect and repair the wiring harness for an open circuit.
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5
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INSPECT CAR-NAVIGATION UNIT COMMUNICATION
• Switch the ignition off (LOCK).
• Disconnect the audio unit connector.
• Inspect for malfunction between the following wiring harnesses.
• Is any malfunction verified?
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Yes
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Inspect and repair the wiring harness.
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No
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Go to the next step.
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6
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DETERMINE IF MALFUNCTION CAUSE IS car-navigation UNIT
• Switch the ignition ON (engine off or on).
• Launch the audio unit diagnostic assist function.
• Select diagnostic assist code 16 external device connection information clearing.
• Switch the ignition off (LOCK).
• Switch the ignition ON (engine off or on).
• Launch the audio unit diagnostic assist function.
• Select diagnostic assist code 15 vehicle NAVI signal verification.
• Is NAVI (USB) NG displayed?
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Yes
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Replace the car-navigation unit.
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No
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Replace the audio unit.
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