Display Does Not Dim Or Brighten With Dimmer (Without Navigation)

Audio System Symptom Troubleshooting - Display does not dim or brighten with dimmer

Display does not dim or brighten with dimmer (without navigation)

NOTE:

- Check the vehicle battery condition first Testing and Inspection.
- Check the connectors for poor connections or loose terminals.

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

2. Turn the combination light switch ON and OFF to see if the symptom can be duplicated.

Can you duplicate the symptom?

YES -

Go to step 3.

NO -

Operation is normal.�

3. Turn the combination light switch OFF.

4. Operate the dashlights brightness control knob.

Does the illumination control dial function normally?

YES -

Operation is normal.�

NO -

Go to step 5.

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

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

6. Disconnect and check audio unit connector A (20P) for loose or a poor connection.

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

Reconnect audio unit connector A (20P) and recheck the symptom; does it still appear?

YES -

Go to step 7.

NO -

Operation is normal.�

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

8. Measure the voltage between audio unit connector A (20P) terminals No. 9 and No. 19. Operate the dashlights brightness control knob to see if the voltage changes.





Does the voltage change?

YES -

Substitute a known-good audio unit Audio Unit Removal/Installation (Without Navigation), and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal/Installation (Without Navigation).�

NO -

Repair an open in the wire between the under-dash fuse/relay box and the gauge control module.�