NO.6 VOLUME INCREASES/DECREASES WHILE DRIVING THE VEHICLE [ENTIRE AUDIO SYSTEM]

id0903e2818500

6 | Volume increases/decreases while driving the vehicle
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Possible DTC | —
Possible cause | • Electronic jamming from outside, or inferior condition of broadcasting station radio wave • Sound level difference between audio modes • Mis-operation of steering switches • Audio unit malfunction (without Bose®) • Audio amplifier malfunction (with Bose®) Note • Inspect the ALC function (without Bose®)/AudioPilot®2 function (with Bose®) while driving the vehicle with playing the CD, etc.

Diagnostic procedure

STEP | INSPECTION | ACTION
--- | --- | ---
1 | • Does the audio volume change only while in radio mode? | Yes | Go to the next step.
No | Go to Step 3.
2 | • Can the location where the audio volume change be specified? | Yes | The system is normal. Explain to the customer that the noise is caused by radio wave disturbances or broadcast wave conditions from the outside.
No | Go to Step 5.
3 | • Does the audio volume change when changing the mode? | Yes | The system is normal. Explain to the customer that the volume change is caused by sound level differences between audio modes.
No | Go to the next step.
4 | • Do the steering switches operate? | Yes | The system is normal. Explain to the customer that the volume change is caused by a mis-operation of the steering switches.
No | Go to the next step.
5 | • Does the ALC (Without Bose®)/AudioPilot®2 function (With Bose®) turn on? | Yes | Go to the next step.
No | Without Bose®: • Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) With Bose®: • Replace the audio amplifier. (See AUDIO AMPLIFIER REMOVAL/INSTALLATION.)
6 | • Turn off the ALC (Without Bose®)/AudioPilot®2 function (With Bose®). • Does the sound change while driving the vehicle? | Yes | Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.)
No | The system is normal. Explains the ALC (Without Bose®)/AudioPilot®2 function (with Bose®) to the customer.