Audio Unit Power Switch Will Not Turn On (No Information Display and No Sound) (With Navigation)

Symptom Troubleshooting: Audio unit power switch will not turn on (No information display and no sound)

Audio unit power switch will not turn on (No information display and no sound) (with navigation)

NOTE:

- Check the vehicle battery condition first.

- Check the connectors for poor connections or loose terminals.

1. Turn the ignition switch to ON (II).

2. Push the power switch ON to see if the navigation unit turns ON.

Does the navigation unit display operate properly, and does the audio sound normal?
YES - Intermittent failure, the system is OK at this time.

NO - Go to step 3.


3. Turn the ignition switch to LOCK (0).

4. Check the No. 23 (10 A) fuse in the under-hood fuse/relay box and the No. 35 (7.5 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?
YES - Go to step 5.

NO - Replace the fuse(s), and recheck.


5. Remove the navigation unit. Service and Repair Check that the navigation unit is properly connected.
NOTE:

- Eject all the discs before removing the navigation unit to prevent damaging the CD player's load mechanism.

- Remove the PC card before removing the navigation unit.

Is it connected properly?
YES - Go to step 6.

NO - Reconnect the connector, and recheck the function.


6. Disconnect navigation unit connector A (24P).

7. Turn the ignition switch to ON (II).

8. Measure the voltage between body ground and navigation unit connector A (24P) terminals No. 14 and No. 24 individually.

Is there battery voltage on both terminals?
YES - Go to step 9.

NO - Repair open in the wire(s) between the No. 23 (10 A) fuse in the under-hood fuse/relay box and the No. 35 (7.5 A) fuse in the under-dash fuse/relay box and the navigation.






9. Turn the ignition switch to LOCK (0).

10. Reconnect navigation unit connector A (24P).

11. Turn the ignition switch to ON (II).

12. Measure the voltage between navigation unit connector A (24P) terminal No. 12 and body ground.

Is there less than 0.1 V on both terminals?
YES - Replace the navigation unit. Service and Repair

NO - Repair open in the wire between navigation unit connector A (24P) terminal No 12 and body ground (G505).. Dashboard Wire Harness (View From Front Passenger's Side) Connector And Harness Locations