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

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.

1. Turn the ignition switch to ON (II).
2. Turn the combination light switch ON and LOCK (0) 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 OFF.
4. Operated the illumination control dial.

Is it normal?

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 the CD player's load mechanism.

Reconnect audio unit connector A (20P) 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.
8. Turn the ignition switch to ON (II).
9. Measure the voltage between audio unit connector A (17P) No. 1 and No. 10 terminals. Operate the dash brightness controller buttons 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. 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.

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