Display Does Not Dim or Brighten With Dimmer

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 Component Tests and General Diagnostics.
* Check the connectors for poor connections or loose terminals.
* The climate control unit 32P (black) connector and the HFL control unit 32P (grey) connector are the same shape. Make sure the correct connector is connected to the applicable unit.

1. 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 check:

-1. Turn the combination lighting switch off.

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

-3. Disconnect the following connector.






-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 rotating the dashlights brightness controller knob several times.










Does the voltage change?
-YES- Replace the center display unit Service and Repair.
-NO- Replace the gauge control module Service and Repair.