TSX L4-2.4L (2005)
Navigation Module: Testing and Inspection
Audio-HVAC Display Module Illumination Troubleshooting
1. Turn the ignition switch to the ON (II) position.
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.
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).
6. Remove the audio-HVAC display module 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 7.
NO - Repair the loose wire terminal, or properly connect audio unit connector A (20P) and recheck the symptom.
7. Turn the illumination control dial on the gauge control module to the full bright position.
8. Measure the voltage between the No. 19 and No. 20 terminals of audio unit connector A (20P).
Is there 1 V or less?
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 is gone, replace the original audio unit.
NO - Repair open in the RED wire between the MICU and the audio-HVAC display module.
9. Remove the audio-HVAC display module 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?
