Inspection and Verification

1. Verify the customer concern by operating the electronic audio system with the engine running and the vehicle in and out of motion.
2. Visually inspect for obvious signs of mechanical and electrical damage.
   VISUAL INSPECTION CHART
   
   

   Mechanical	Electrical
   Audio unit Antenna or antenna cable Audio speakers mounting/speaker cones Audio unit frequency interference suppression bond or audio unit receiver hood bonding strap (part of RH hood hinge)	Battery junction box (BJB) fuse 2 (40A) (TREMOR audio package) Smart junction box (SJB) fuse(s): 6 (10A) 21 (5A) 24 (20A) 12 (15A) (CDX6 audio unit) Connectors Ignition switch Circuitry Audio unit

3. If the fault is not visually evident, proceed to determine the fault by carrying out the speaker walk-around test.

   SPEAKER WALK-AROUND TEST - AM/FM AUDIO UNIT 

   NOTE: The audio unit must be turned on to enter the speaker walk-around test.
   1. To enter the test, press preset buttons 1 and 3 simultaneously and hold approximately 3 seconds and release.
   2. The test stops at each speaker and applies sound to the speaker for 1 to 2 seconds. Each speaker is tested in the following sequence: RH, LH.
   3. To exit the test, turn the ignition switch off or turn the audio unit off.
   4. If the concern remains and the fault is not detected, proceed to the SYMPTOM CHART  to continue diagnostics.

SPEAKER WALK-AROUND TEST - ALL EXCEPT AM/FM AUDIO UNIT 

1. To enter the test, press preset buttons 3 and 6 simultaneously and hold approximately 3 seconds, then release.
2. The test stops at each speaker and applies sound to the speaker for 1 to 2 seconds. Each speaker is tested and shown on the display in the following sequence: RF, LF, LR, RR.
3. To exit the test, turn the ignition switch off, turn the audio unit off, or press preset button 1 for diagnostics. Also, the TREMOR audio unit will automatically exit the speaker walk-around test when it is complete.
   NOTE: Always document, clear, and carry out the self-test again.
4. The TREMOR Audio Unit, Dual Media and CDX6 Self-Diagnostic Mode has 5 manual tests available:
   • Preset button 1 = ENTER DIAGNOSTICS. This test enters diagnostics from the speaker walkaround test. The on-demand self-test of the audio subsystem is performed. This tests for problems with RAM, ROM or EEPROM.
   • Preset button 2 = CONTINUOUS DTCS. This test enters diagnostics from the speaker walkaround test. View any diagnostic trouble codes (DTC) currently set.
   • Preset button 3 = SIGNAL STRENGTH TEST. This test shows the average signal strength of the currently tuned frequency over a 5-second interval.
   • Preset button 4 = Software configuration level. This test queries each audio unit system controller for its software configuration level.
   • Preset button 5 = DISPLAY TEST. This test lights all the Dual Media display segments for 5 seconds and then turns all segments off.
5. To exit the TREMOR Audio Unit, Dual Media or CDX6 Self-Diagnostic Mode, turn the ignition switch off or turn the audio unit off. Also, on the TREMOR audio unit pressing preset buttons 3 and 6 simultaneously will re-enter the speaker walk-around test and automatically exit Self-Diagnostic Mode when the test is complete.
6. If the concern remains and the fault is not detected, proceed to the SYMPTOM CHART  to continue diagnostics.