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)

NOTE: Check the vehicle battery condition first.

1. Turn the ignition switch to ON (II).
2. Push the power switch ON to see if the audio unit turns ON.

Does the audio unit operate properly and 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. 8 (10 A) fuse in the under-hood fuse/relay box and the No. 26 (7.5 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?

YES - Go to step 5.

NO - Replace the fuse, and recheck.

5. Remove the audio unit. Check that the audio unit is properly connected.

NOTE: Eject the CD before removing the audio unit to prevent damaging the CD player's load mechanism.

Is it connected properly?

YES - Go to step 6.

NO - Reconnect the connector, and recheck the function.

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






Is there battery voltage?

YES - Go to step 9.

NO - Repair open in the wire(s) between the No. 8 (10 A) fuse in the under-hood fuse/relay box and No. 26 (7.5 A) in the under-dash fuse/relay box and the audio unit.

9. Turn the ignition switch to LOCK (0).
10. Reconnect audio unit connector A (17P).
11. Measure the voltage between audio unit connector A (17P) No. 9 terminal and body ground.






Is there less than 0.1 V?

YES - Replace the audio unit.

NO - Repair open in the wire between audio unit connector A (17P) No. 9 terminal and body ground (G401).