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 12 Volt Battery Test.
- 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 or does not work properly 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.

Can you duplicate the symptom?

YES -

Go to step 3.

NO -

Operation is normal.

3. Turn the combination light switch off.

4. Operate the SELECT/RESET knob to adjust the dashlight brightness.

Does the SELECT/RESET knob function normally?

YES -

Operation is normal.

NO -

- Except DX model: Go to step 5.
- DX model: Go to step 10.

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

6. Remove the audio unit.

7. Disconnect and check audio unit connector A (24P) for a loose or 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 (24P), and recheck the symptom; does it still appear?

YES -

Go to step 8.

NO -

Operation is normal.

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

9. Measure the voltage between audio unit connector A (24P) terminals No. 1 and No. 13. Operate the SELECT/RESET knob to adjust the dashlights brightness to see if the voltage changes.





Does the voltage change?

YES -

Substitute a known-good center panel, and recheck. If the symptom/indication goes away, replace the original center panel Audio Unit Removal / Installation. If the symptom is still present, substitute a known-good audio unit Audio Unit Removal / Installation, and recheck. If the symptom/indication goes away, replace the original audio unit Audio Unit Removal / Installation.

NO -

Check for an open in the wires between the audio unit, the under-dash fuse/relay box, and the gauge control module. If the wires are OK, substitute a known-good gauge control module Service and Repair, and recheck. If the symptom/indication goes away, replace the original gauge control module Service and Repair.

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

11. Remove the audio unit.

12. Disconnect and check audio unit connector A (17P) for a loose or 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 13.

NO -

Operation is normal.

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

14. Measure the voltage between audio unit connector A (17P) terminals No. 1 and No. 10. Operate the SELECT/RESET knob to adjust the dashlights brightness to see if the voltage changes.





Does the voltage change?

YES -

Substitute a known-good audio unit, and recheck. If the symptom/indication goes away, replace the original audio unit.

NO -

Check for an open in the wires between the audio unit, the under-dash fuse/relay box, and the gauge control module Service and Repair, and recheck. If the symptom/indication goes away, replace the original gauge control module Service and Repair.