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

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

NOTE: Check the vehicle battery condition first.

1. With the ignition switch in ON (II), push the power switch ON to see if 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 2.

2. Turn the ignition switch to LOCK (0).
3. Check the No. 23 (10 A) fuse in the under-hood fuse/relay box and No. 35 (7.5 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?

YES - Go to step 4.

NO - Replace the fuse, and recheck.

4. Remove the navigation unit. Check that the navigation unit is properly connected.

Is it connected properly?

YES - Go to step 5.

NO - Reconnect the connector, and recheck the function.

5. Disconnect navigation unit connector A (17P).

NOTE:
- Eject all the CDs before removing the navigation unit to prevent damaging the CD player's load mechanism.
- Remove the PC card before removing the navigation unit.

6. Turn the ignition switch to ON (II).
7. Measure the voltage between body ground and navigation unit connector A (17P) terminals No. 14 and No. 17 individually.






Is there battery voltage on both terminals?

YES - Go to step 8.

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 audio unit.

8. Reconnect navigation unit connector A (17P).
9. Turn the ignition switch to ON (II).
10. Measure the for voltage between navigation unit connector A (17P) No. 9 terminal and body ground.






Is there less than 0.1 V?

YES - Replace the navigation unit.

NO - Repair open in the wire between navigation unit connector A (17P) No. 9 terminal and body ground (G505).