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Audio-HVAC Display Module Illumination Troubleshooting

WARNING: This page is about a different car, the 2008 Acura TSX, 2007 Acura TSX, 2006 Acura TSX, 2005 Acura TSX, and 2004 Acura TSX. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Check the vehicle battery condition first.
  1. Turn the ignition switch ON (II).
  2. Turn the combination light switch ON.
  3. Turn the illumination control dial on the gauge control module back and forth between full dim and full bright.

    Does the problem with the illumination affect only the audio-HVAC display panel? 

    YES  - Go to step 4.

    NO  - Go to B-CAN Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

  4. Turn the illumination control dial on the gauge control module back and forth between full dim and full bright while watching the audio-HVAC display panel buttons, button LEDs, LCD displays and lower panel ambient light.
  5. Proceed with the diagnostic procedure for the appropriate symptom(s).
    SYMPTOM CHART

    Symptom Diagnostic Procedure
    • Buttons stay bright and do not adjust with dimmer
    • LEDs dim with dimmer off of full bright position
    • LCD display is full bright and does not adjust with dimmer
    • Lower panel ambient light may or may not dim with dimmer
    		 Go to step  6.
    • Buttons do not light up
    • LEDs do not dim
    • LCD display is full bright and does not adjust with dimmer
    • Lower panel ambient light may or may not dim with dimmer
    		 Go to step  12.
    • Lower panel ambient light does not light up
    • Buttons dim with dimmer
    • LEDs dim with dimmer off of full bright position
    • LCD display dims with dimmer
    		 Go to step  18.
    • Symptom other than those listed above
    		 Replace the audio-HVAC display module.
  6. Turn the ignition switch to LOCK (0).
  7. Remove the audio-HVAC display module (see AUDIO-HVAC DISPLAY MODULE REMOVAL/INSTALLATION  ) and check for loose wires terminals or poor connections at audio unit connector A (20P).

    Are all the wire terminals tight, and is audio unit connector A (20P) connected properly? 

    YES  - Go to step 8.

    NO  - Repair the loose wire terminal, or properly connect audio unit connector A (20P) and recheck the symptom.

  8. Turn the ignition switch ON (II).
  9. Turn the combination light switch ON.
  10. Turn the illumination control dial on the gauge control module to the full bright position.
  11. Measure the voltage between the No. 19 and No. 20 terminals of audio unit connector A (20P).

    Is there less than 0.1 V? 

    YES  - Check connections at audio unit connector A (20P). If connections are OK substitute a known-good audio unit and recheck the symptom. If the symptom/indication goes away, replace the original audio unit.

    NO  - Repair open in the RED wire between the MICU and the audio-HVAC display module.

  12. Turn the ignition switch to LOCK (0).
  13. Remove the audio-HVAC display module (see AUDIO-HVAC DISPLAY MODULE REMOVAL/INSTALLATION  ) and check for loose wire terminals or poor connections at audio unit connector A (20P).

    Are all the wire terminals tight, and is audio unit connector A (20P) connected properly? 

    YES  - Go to step 14.

    NO  - Repair the loose wire terminal, or properly connect audio unit connector A (20P) and recheck the symptom.

  14. Turn the ignition switch ON (II).
  15. Turn the combination light switch ON.
  16. Turn the illumination control dial on the gauge control module to the full bright position.
  17. Measure the voltage between the No. 9 and No. 19 terminals of the audio unit connector A (20P).

    Is there battery voltage? 

    YES  - Check connections at the audio unit connector A (20P). If connections are OK substitute a known-good audio unit and recheck the symptom. If the symptom/indication goes away, replace the original audio unit.

    NO  - Repair open in the RED/BLK wire between the under-hood fuse/relay box and the audio-HVAC display panel.

  18. Turn the ignition switch to LOCK (0).
  19. Remove the audio-HVAC display module (see AUDIO-HVAC DISPLAY MODULE REMOVAL/INSTALLATION  ) and check for loose wire terminals or poor connections at audio-HVAC display panel connector B (16P).

    Are all the wire terminals tight, and is audio-HVAC display panel connector B (16P) connector connected properly? 

    YES  - Go to step 20.

    NO  - Repair the loose wire terminal, or properly connect audio-HVAC display panel connector B (16P) and recheck the symptom.

  20. Turn the ignition switch ON (II).
  21. Turn the combination light switch ON.
  22. Turn the illumination control dial on the gauge control module to the full bright position.
  23. Measure the voltage between the No. 12 and No. 6 terminals of audio-HVAC display panel connector B (16P).

    Is there less than 0.1 V? 

    YES  - Go to step 24.

    NO  - Repair open in the RED wire between the MICU and the audio-HVAC display panel.

  24. Measure the voltage between the No. 8 and No. 6 terminals of the audio-HVAC display panel connector B (16P).

    Is there battery voltage? 

    YES  - Check connections at audio-HVAC display panel connector B (16P). If connections are OK substitute a known-good audio-HVAC display panel and recheck the symptom. If the symptom/ indication goes away, replace the original audio-HVAC display panel.

    NO  - Repair open in the RED/BLK wire between the under-hood fuse/relay box and the audio-HVAC display panel.

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