Security indicator does not work properly

WARNING: This page is about a different car, the 2009 Acura MDX, 2008 Acura MDX, and 2007 Acura MDX. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

The system will not operate without the 4-digit : security (anti-theft) code.
Before, troubleshooting, confirm that a 4-digit security (anti-theft) code is recorded.

Turn off the audio system.
Is the security indicator (LED) light on (blink)?

YES - Go to Step 2.

NO - Substitute a known-good audio unit and. recheck. If the symptom/indication goes away, replace the original audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). If the, symptom is still present, substitute a known-good audio panel and recheck. If the symptom/ indication goes away, replace the original audio panel (see AUDIO UNIT REMOVAL/INSTALLATION ).
Turn on the audio system.
Is the security indicator (LED) light out?

YES - The audio unit is OK at this time. Check for loose or poor connections at audio unit and audio panel.

NO - Substitute a known-good audio unit and recheck. If the symptom/indication goes away, replace the original audio unit (see AUDIO UNIT REMOVAL/INSTALLATION ). If the symptom is still present, substitute a known-good audio panel and recheck. If the symptom/ indication goes away, replace the original audio panel (see AUDIO UNIT REMOVAL/INSTALLATION ).