Display Does Not Dim Or Brighten With Dimmer (Without Multi-Information Display)

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

Display does not dim or brighten with dimmer

NOTE:
* Check the vehicle battery condition first Battery Test.
* Check the connectors for poor connections or loose terminals.

1. Problem verification:

Problem verification
-1. Turn the ignition switch to ON (II).

-2. Turn the combination lighting switch to the parking light position.

-3. Rotate the dashlights brightness controller knob several times.

Does the audio display brightness change?
-YES- Intermittent failure, the system is OK at this time.
-NO- The failure is duplicated, go to step 2.

2. Gauge control module (tach) check:

Gauge control module (tach) check
-1. Turn the combination light switch off.

-2. Turn the ignition switch to LOCK (0).

-3. Disconnect the following connector.
NOTE: Eject all the discs before disconnecting the audio unit to prevent damaging the CD player's load mechanism.





-4. Turn the ignition switch to ON (II).

-5. Turn the combination lighting switch to the parking light position.

-6. Measure the voltage between test points 1 and 2 while pressing the dashlights brightness controller button several times.









Does the voltage change?
-YES- Replace the audio unit Audio Unit Removal and Installation.
-NO- Replace the gauge control module (tach) Gauge Control Module (Tach) Removal and Installation.