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

id0903e2818500

6

Volume increases/decreases while driving the vehicle

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.

6	Volume increases/decreases while driving the vehicle
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.
1	• Does the audio volume change only while in radio mode?	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.
2		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.
3	• Does the audio volume change when changing the mode?	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.
4	• Do the steering switches operate?	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.
5		No	Without Bose^®: • Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) (See AUDIO UNIT DISASSEMBLY/ASSEMBLY.) 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	With CD changer • Go to the next step. With CD player • Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) (See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)
6		No	The system is normal. Explains the ALC (Without Bose^®)/AudioPilot^®2 function (with Bose^®) to the customer.
7	• Verify that all of the audio unit reset conditions for the customer's audio unit are met. (See AUDIO UNIT RESET PROCEDURE [ENTIRE AUDIO SYSTEM].) • Are all of the audio unit reset conditions for the customer's audio unit met?	Yes	Perform the audio unit reset. (See AUDIO UNIT RESET PROCEDURE [ENTIRE AUDIO SYSTEM].)
7		No	Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION.) (See AUDIO UNIT DISASSEMBLY/ASSEMBLY.)

6	Volume increases/decreases while driving the vehicle
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.