NO.1 CAR-NAVIGATION SYSTEM DOES NOT START OPERATION [CAR-NAVIGATION SYSTEM]

id0903e8834000

1 | Even if the NAVI mode is selected, the car-navigation system screen does not display.
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Possible DTC | —
POSSIBLE CAUSE | • 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

Diagnostic Procedure

Step | Inspection | Action
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1 | VERIFY MALFUNCTION SYMPTOM • Turn the ignition switch to the ON position. • Turn the audio unit power supply on and select the NAVI mode. • Does the car-navigation system launch and the map screen display? | Yes | Go to Step 6.
No | Go to the next step.
2 | DETERMINE IF MALFUNCTION CAUSE IS SWITCH • Operate switches other than the NAVI switch. • Do the modes other than the NAVI mode switch normally? | Yes | Go to the next step.
No | Inspect the switch referring to the switch inspection procedure of the diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [AUDIO].)
3 | INSPECT CAR-NAVIGATION UNIT POWER SUPPLY • Turn the ignition switch to the ACC position. • Measure the voltage at the following terminals: ― Terminal 1H (+B) ― Terminal 1G (ACC) • Is the voltage value the battery voltage? | Yes | Go to the next step.
No | • 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.
4 | INSPECT CAR-NAVIGATION UNIT GROUND • Turn the ignition switch to the OFF position. • 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? | Yes | Go to the next step.
No | If there is a common connector:If there is no common connector: Inspect and repair the ground point for looseness, disengagement, or lifting. Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and ground. • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. • Repair or replace the wiring harness which has an open circuit.
5 | INSPECT CAR-NAVIGATION UNIT COMMUNICATION • Turn the ignition switch to the ON position. • Disconnect the audio unit connector. • Inspect for malfunction between the following wiring harnesses. ― Audio unit terminal 5A and car-navigation unit terminal 2A ― Audio unit terminal 5B and car-navigation unit terminal 2B ― Audio unit terminal 5C and car-navigation unit terminal 2C ― Audio unit terminal 5D and car-navigation unit terminal 2D • Is any malfunction verified? | Yes | If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between audio unit and car-navigation unit. • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. • Repair or replace the wiring harness which has an open circuit.
No | Go to the next step.
6 | DETERMINE IF MALFUNCTION CAUSE IS car-navigation UNIT • Turn the ignition switch to the ON position. • Launch the audio unit diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [AUDIO].) • Select diagnostic assist code 16 external device connection information clearing. • Turn the ignition switch to the OFF position. • Turn the ignition switch to the ON position. • Launch the audio unit diagnostic assist function. (See DIAGNOSTIC ASSIST FUNCTION [AUDIO].) • Select diagnostic assist code 15 vehicle NAVI signal verification. • Is NAVI (USB) NG displayed? | Yes | Replace the car-navigation unit. (See CAR-NAVIGATION UNIT REMOVAL/INSTALLATION.)
No | Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)