TSX L4-2.4L (2005)
YES - Go to step 10.
NO - Repair the loose wire terminal, or properly connect audio unit connector A (20P) and recheck the symptom.
10. With the combination light switch still ON, turn the illumination control dial on the gauge control module to the full bright position.
11. 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 is gone, 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.
12. Remove the audio-HVAC display module 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 13.
NO - Repair the loose wire terminal, or properly connect audio-HVAC display panel connector B (16P) and recheck the symptom.
13. Turn the illumination control dial on the gauge control module to the full bright position.
14. Measure the voltage between the No. 12 and No. 6 terminals of audio-HVAC display panel connector B (16P).
Is there 1 V or less?
YES - Go to step 15.
NO - Repair open in the RED wire between the MICU and the audio-HVAC display panel.
15. 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 is gone, 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.
