Reading and Clearing Diagnostic Trouble Codes

AUDIO UNIT SELF-DIAGNOSTIC MODE

NOTE: The audio unit self-diagnostic mode can only be entered while in the speaker walk-around test.

1. The audio unit self-diagnostic mode has 5 tests available:
- Preset button 1 = Audio internal/external SELF-TEST. If SELF FAIL is displayed, press the TUNE > button to scroll view the DTCs stored. Refer to the Audio Unit DTC Chart. If the system is OK, SELF PASS is displayed. Diagnostic Trouble Code Tests and Associated Procedures
- Preset button 2 = View/clear continuous DTCs. NO DTCS is displayed if no DTCs are retrieved. If DTCS FOUND is displayed, press the TUNE > button to view the DTCs retrieved. Refer to the Audio Unit DTC Chart. To clear all DTCs, press the EJECT button. DTCS CLEAR is displayed. Diagnostic Trouble Code Tests and Associated Procedures
- Preset button 3 = SIGNAL TEST. This test measures the average strength at the current tuner setting.
- Preset button 4 = Software configuration level. This test queries each radio system controller for its software configuration level. SOFT LEVELS is displayed upon completion of the query. Press the TUNE > button to scroll view the software configuration version level.

Configurations and Software Levels:

- Preset button 5 = DISPLAY TEST. This test lights all the audio unit display segments for 5 seconds and then turns all segments off. When the test is complete, DISPLAY TEST is displayed on the bezel.

2. To enter these tests, press the preset button desired while in the speaker walk-around test. This aborts the speaker walk-around test and starts the selected test.
3. To exit the audio unit self-diagnostic mode, turn the ignition switch or audio unit off.
4. If the concern remains and the fault is not detected, GO to Symptom Chart. Symptom Related Diagnostic Procedures