Initial Inspection and Diagnostic Overview
Self-diagnostic FunctionStarting the self-diagnostic function (with Navigation)
1. Turn the ignition switch to ACC (I) or ON (II).
2. Turn the audio unit off.
3. While holding down the upper part of both the "CH/DISK" and "SEEK/SKIP" bars simultaneously, press the VOL/PWR knob.
4. "DIAG" will appear on the audio-HVAC subdisplay unit to indicate you have entered the self-diagnostic mode.
5. By pressing a button while "DIAG" is displayed, the input will trigger a mode that is assigned to that switch.
AM/FM button
Entire LCD lighting mode: Turns on the entire LCD to show the presence or absence of an LCD failure.
CD/AUX (HXM) button
Entire LCD light-out mode: Turns off the entire LCD to show the presence or absence of an LCD failure.
SEEK SKIP bar (>>)
Display IS-BUS communication verification status: Displays the verification of the communication between the climate control unit and Navigation-display (toggles between "NVD" and "AC" every 5 seconds).
SEEK SKIP bar (<<)
Display 12C-BUS communication verification status: Displays the verification of the communication among the display, the EEPROM, and the tuner (toggles between "DSP", "EEP" and "TNR" every 5 seconds).
SCAN button
Active noise control (ANC) system mode: Pressing the SCAN button toggles the active control function between ON and OFF. After each toggle to OFF, in order to repeat the test, turn the ignition switch to OFF (0), then repeat step 1 then 4.
6. The self-diagnostic function will end when the audio unit is turned off, or the ignition switch is turned off.
How to check the active noise control system in this check mode
- With the engine stopped and while in DIAG mode, turn the ANC ON to OFF by pressing the SCAN button, a low-frequency hum (50 Hz) should sound for about a minute.
- If the hum does not sound, check for an open in the wire between the active noise control unit and the audio unit.
- If the hum does not sound for minute, check for an open in the wire between the active noise control unit and the microphones.
- Start the engine while the hum is sounding, the hum should stop. If the hum does not stop, check for an open in the wire (NEP line) between the active noise control unit and the PCM.
Starting the self-diagnostic function (without Navigation)
1. Turn the ignition switch to ACC (I) or ON (II).
2. Turn the audio unit ON.
3. While holding down both the "Preset 1" and "Preset 6" buttons simultaneously, press the AUDIO PWR knob.
4. "DIAG" will appear on the audio unit display to indicate you have entered the self-diagnostic mode.
5. By pressing a button while "DIAG" is displayed, the input will trigger a mode that is assigned to that button.
Preset 1 button
Active noise control (ANC) system check mode: Pressing the preset 1 button toggles the active control function between ON and OFF. After each toggle to OFF, in order to repeat the test, turn the ignition switch to OFF (O), then repeat step 1 then 4.
Preset 3 button
Entire LCD lighting mode: Turns on the entire LCD to show the presence or absence of an LCD failure.
Preset 4 button
Entire LCD lights-out mode: Turns off the entire LCD to show the presence or absence of an LCD failure.
6. The self-diagnostic function will end when the audio unit is turned off, or the ignition switch is turned off.
How to check the active noise control system in this check mode
- With the engine stopped and while in DIAG mode, turn the ANC ON to OFF by pressing the No. 1 button, a low-frequency hum (50 Hz) should sound for about a minute.
- If the hum does not sound, check for an open in the wire between the active noise control unit and the audio unit.
- If the hum does not sound for minute, check for an open in the wire between the active noise control unit and the microphone.
- Start the engine while the hum is sounding, the hum should stop. If the hum does not stop, check for an open in the wire (NEP line) between the active noise control unit and the PCM.