No.2 CALLER'S VOICE VOLUME TOO LOW, OR NOISE INTERRUPTS CALL [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)]

2	Caller’s voice volume too low, or noise interrupts call
Possible cause	• Problem in the cellular phone ― A cellular phone other than a Hands-free telephone system-enabled models is used ― Vehicle is in a place where signal transmission is weak ― Bluetooth does not operate • Influence due to vehicle driving conditions ― Noise while driving is loud (engine, tire noise, blower fan noise) ― Windows and/or sunroof are open • Bluetooth unit does not receive the vehicle speed signal ― CAN communication error • Malfunction in the microphone related parts ― Poor connection in the connector ― Open or short circuit in the wiring harness between the microphone and the Bluetooth unit ― Microphone malfunction • Malfunction in the Hang-up/Pick-up/Talk switch ― Poor connection in the connector ― Open or short circuit in the wiring harness between the Hang-up/Pick-up/Talk switch and the Bluetooth unit ― Hang-up/Pick-up/Talk switch malfunction • Malfunction in the audio system ― Steering switch (+) and/or related circuit malfunction • Bluetooth unit malfunction

Caller’s voice volume too low, or noise interrupts call

Possible DTC

Using the M-MDS

U0498:68

Without using M-MDS (On-board diagnostic test mode)

26:Er81

Possible cause

• Problem in the cellular phone

― A cellular phone other than a Hands-free telephone system-enabled models is used

― Vehicle is in a place where signal transmission is weak

― Bluetooth does not operate

• Influence due to vehicle driving conditions

― Noise while driving is loud (engine, tire noise, blower fan noise)

― Windows and/or sunroof are open

• Bluetooth unit does not receive the vehicle speed signal

― CAN communication error

• Malfunction in the microphone related parts

― Poor connection in the connector

― Open or short circuit in the wiring harness between the microphone and the Bluetooth unit

― Microphone malfunction

• Malfunction in the Hang-up/Pick-up/Talk switch

― Poor connection in the connector

― Open or short circuit in the wiring harness between the Hang-up/Pick-up/Talk switch and the Bluetooth unit

― Hang-up/Pick-up/Talk switch malfunction

• Malfunction in the audio system

― Steering switch (+) and/or related circuit malfunction

• Bluetooth unit malfunction

• When performing an asterisked (*) troubleshooting inspection, slightly shake the wiring harness and connectors while performing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If there is a problem, verify that the connectors, terminals and wiring harness are connected correctly and undamaged.

STEP	INSPECTION		ACTION
1	• Verify if the customer’s cellular phone is a Hands-free telephone system-enabled model by referring to http://www.mazdausa.com/MusaWeb/displayPage.action? pageParameter=bluetoothHandsFreeSystem. • Is the customer’s cellular phone a Hands-free telephone system-enabled model?	Yes	Go to the next step.
1		No	Explain to the customer that the customer’s cellular phone is not a Hands-free telephone system-enabled model.
2*	• Can the audio volume be controlled using steering switch?	Yes	Go to the next step.
2*	• Can the audio volume be controlled using steering switch?	No	Inspect and repair the steering switch and related wiring harness.
3	• Does the symptom appear under following conditions? ― Windows and/or sunroof are open ― Noise while driving is loud (engine, tire noise, blower fan noise)	Yes	The system is normal. (Influence due to vehicle driving conditions)
3		No	Go to the next step.
4	• Perform the Bluetooth system (hands-free telephone (HF/TEL) system) DTC inspection. • Is U0498:68/26:Er81 displayed?	Yes	Inspect and repair the audio system CAN communication.
4		No	Go to the next step.
5*	• Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections. ― Between microphone terminal A and Bluetooth unit terminal A ― Between microphone terminal B and Bluetooth unit terminal B ― Between microphone terminal C and Bluetooth unit terminal C ― Between shield wire and Bluetooth unit terminal D ― Between microphone terminal E and Bluetooth unit terminal E • Are the harnesses and connector connections normal?	Yes	Go to the next step.
5*		No	Repair or replace malfunctioning parts.
6	• Inspect the following switches. (See STEERING SWITCH INSPECTION.) ― Hung-up switch ― Pic-up switch ― Talk switch • Are the switches normal?	Yes	Go to the next step.
6		No	Replace the steering switch. (See STEERING SWITCH REMOVAL/INSTALLATION.)
7*	• Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections. ― Between audio unit (24-pin) terminal 1P and steering switch terminal I • Are the harnesses and connector connections normal?	Yes	Go to the next step.
7*		No	Repair or replace malfunctioning parts.
8	• Make a call with the cellular phone without using Bluetooth system. • Does the same symptom appear?	Yes	Cellular phone related problem.
8		No	Go to the next step.
9	• Call the hands-free cell phone using another cellular phone. • Does the same symptom appear?	Yes	Go to the next step.
9		No	The cellular phone Bluetooth system is malfunctioning.
10	• Replace the microphone. (See MICROPHONE REMOVAL/INSTALLATION.) • Does the same symptom appear?	Yes	Replace the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.)
10		No	Troubleshooting is completed. (The microphone is malfunctioning.)