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

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.

- Check the connectors for poor connections or loose terminals.

- If the vehicle is equipped with navigation, refer to the Display day/night mode does not work. Symptom Troubleshooting

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.

Is it duplicated?
YES - Go to step 3.

NO - Operation is normal.


3. Turn the combination light switch to OFF.

4. Rotate the illumination control dial.

Does the illumination dim and brighten normally as you rotate the dial?
YES - Operation is normal.

NO - Go to step 5.


5. Disconnect, and check audio unit connector A (17P) for loose or a poor connection.
NOTE: Eject all the discs before removing the audio unit to prevent damaging the CD player's load mechanism.

Reconnect audio unit connector A (17P) and recheck the symptom; does it still appear?
YES - Go to step 6.

NO - Operation is normal.


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

7. Remove the audio unit. Audio Unit Removal/Installation (Without Navigation, With Audio)

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

9. Measure the voltage between audio unit connector A (17P) terminals No. 1 and No. 10. Rotate the dash brightness controller buttons to see if the voltage changes.

Does the voltage change?
YES - Substitute a known-good audio unit Audio Unit Removal/Installation (Without Navigation, With Audio), and recheck. If the symptom/indication goes away, replace the original audio unit. If symptom is still present, substitute a known-good center panel display, and recheck. If the symptom/indication goes away, replace the original center panel display. Audio Unit Removal/Installation (Without Navigation, With Audio)

NO - Repair open in the wire between the under-dash fuse/relay box and the gauge control module.