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

Power switch will not turn ON (No information display and no sound)

1. With the ignition switch ON (II), push the power switch ON to see if audio unit turns ON.

Does the audio unit display operate properly, and does the audio unit sound normal?

YES - Intermittent failure, the system is OK at this time.

NO - Go to step 2.

2. Turn the ignition switch OFF.
3. Check the No. 22 (15 A) fuse and No. 9 (10 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 audio unit. Check that the audio unit is properly connected.

Is it connected properly?

YES - Go to step 5.

NO - Reconnect the connector, and recheck the function.

5. Disconnect the audio unit 20P connector.
6. Turn the ignition switch ON (II).




7. Measure the voltage between the No. 2 and No. 10 terminals of the audio unit 20P connector and body ground.

Is there battery voltage?

YES - Go to step 8.

NO - Repair any open in the wire(s) between the No. 22 (15 A) fuse and No. 9 (10 A) in the under-dash fuse/relay box and the audio unit.

8. Reconnect the audio unit 20P connector.
9. Turn the ignition switch ON (II).




10. Check for voltage between audio unit 20P connector No. 20 terminal and body ground while pressing and releasing the audio unit power switch several times.

Is there less than 0.1 V?

YES - Replace the audio unit.

NO - Repair open in the wire between the audio unit connector A (20P) No. 20 terminal and body ground (G502).