Posted 14 September 2017 - 07:33 PM
Try a ACU diagnostics test.
With the radio turned on and switched to either AM or FM, press and hold preset buttons 3 and 6. The radio will enter the speaker walk around test. (Be prepared for a loud tone coming from one of the speakers. If you wait a few seconds, it will stop and it will switch to the next speaker).
At any time in tbe speaker test, and before it finishes, enter the diagnostics mode. If you do NOT have nsvigstion, press
Preset button 1: the on-demand Self-Test. This button runs the on-demand self-test.
Pressing the MENU DOWN button allows scrolling of any DTCs found during the test while in this menu.
Preset button 2 = Display Continuous DTCs. This button enables viewing of any continuous DTCs that have been logged.
Pressing the MENU UP button allows scrolling of any DTCs while in this menu.
While continuous DTCs are being displayed, pressing the EJECT button will clear all present DTCs.
Preset button 3 = Signal Strength Test. This button displays the signal strength.
Preset button 4 = Software Version Display. This button displays the audio unit software version.
Pressing the MENU UP button allows scrolling of all audio subsystem software versions while in this menu.
Preset button 5 = Display Test. This test illuminates all the display segments for 5 seconds, then turns all segments off.
Preset button 6 = Configuration Status. This button enables audio unit configuration status.
Pressing the MENU button displays the ACM part number while in this menu.
To exit the self-diagnostic mode, turn the audio unit off or turn the key OFF.
If the concern remains and the fault is not detected, GO to Symptom Chart - Audio System to continue diagnostics.
If you DO have navigation, press the end test button on the screen and select the test from the available menu.
Ruming this test may reveal if any defect codes have been triggered and stored in the ACU (radio).