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 Battery Test.
- Check the connectors for poor connections or loose terminals.

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

2. Turn the headlight switch to the parking or headlight on position.

3. Check the front climate control unit display.

Does the climate control illumination change with dimmer?

YES -

Go to step 4.

NO -

Go to climate control unit troubleshooting Testing and Inspection.�

4. Check the No. 7 (10 A) fuse and the No. 32 (10 A) fuse in the under-dash fuse/relay box.

Are the fuses OK?

YES -

Go to step 5.

NO -

Replace the fuse(s), and recheck.�

5. Remove the audio unit Audio Unit Removal/Installation. Check that the audio unit and climate control unit connectors are properly connected.

Are they connected properly?

YES -

Go to step 6.

NO -

Repair poor connections and reconnect the connector, and recheck.�

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

7. Disconnect audio unit connector C (24P) and climate control unit connector B (14P).

8. Check for continuity between audio unit connector C (24P) terminal No. 24 and climate control unit connector B (14P) terminal No. 8.





Is there continuity?

YES -

Go to step 9.

NO -

Repair an open in the wire between the audio unit and the climate control unit.�

9. Check for continuity between audio unit connector C (24P) terminal No. 24 and body ground.





Is there continuity?

YES -

Repair a short to body ground in the wire between the audio unit and the climate control unit.�

NO -

Go to step 10.

10. Measure the voltage between climate control unit connector A (40P) terminal No. 1 and body ground.





Is there battery voltage?

YES -

Go to step 11.

NO -

Repair an open in the wire between the No. 7 (10 A) fuse in the under-dash fuse/relay box and the climate control unit.�

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

12. Measure the voltage between climate control unit connector A (40P) terminal No. 25 and body ground.





Is there battery voltage?

YES -

Go to step 13.

NO -

Repair an open in the wire between the No. 32 (10 A) fuse in the under-dash fuse/relay box and the climate control unit.�

13. Measure the voltage between climate control unit connector A (40P) terminal No. 37 and body ground.





Is there less than 0.2 V?

YES -

Substitute a known-good climate control unit Climate Control Unit Removal/Installation, and recheck. If the symptom/indication goes away, replace the original climate control unit Climate Control 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 -

Repair an open or high resistance in the wire between climate control unit connector A (40P) terminal No. 37 and body ground (G506).�