Power Switch Will Not Turn ON (No Information Display and No Sound)

Power Switch Will Not Turn ON (No Information Display And No Sound)

NOTE:
- Always check the connectors for poor connections or loose terminals.
- Check the vehicle battery condition first.

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

Does the audio unit display operate properly, and the audio unit 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, and recheck.

5. Remove the audio unit. Check that the audio unit connectors are properly connected.

Is it connected properly?

YES - Go to step 6.

NO - Repair poor connections and reconnect the connector, and recheck the function.

6. Disconnect audio unit connector A (17P).

NOTE: Eject all the CDs before disconnecting the audio unit and CD changer to prevent damaging the CD player's load mechanism.

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






Is there battery voltage?

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, the No. 35 (7.5 A) fuse in the under-dash fuse/relay box and the audio unit.

9. Reconnect audio unit connector A (17P).
10. Measure the voltage between audio unit connector A (17P) No. 9 terminal and body ground.






Is there less than 0.1 V?

YES
- With ELS audio system: Replace the audio unit.
- With premium audio system: Go to step 10.

NO - Repair open in the wire between the audio unit connector A (17P) No. 9 terminal and body ground (G504).

11. Disconnect audio switch panel connector A (20P).
12. Turn the ignition switch to ON (II).
13. Measure the voltage between the audio switch panel connector A (20P) No. 11 terminal and body ground.






Is there about 5V?

YES - Go to step 13.

NO - Repair open in the wire between the audio switch panel and body ground.

14. Measure the voltage between audio switch panel connector A (20P) No. 1 terminal and body ground.






Is there less then 0.5 V?

YES - Substitute a known-good audio switch panel, then reconnect all connectors and recheck. If the symptom/indication goes away, replace the original audio switch panel. If symptom/indication is still present, replace the audio unit.

NO - Repair open in the wire between audio switch panel connector A (20P) No. 1 terminal and audio unit connector C (28P) No. 7 terminal or check for a short to power. If there is no short to power, substitute a known-good audio unit and retest. If the symptom goes away, replace the original audio unit.