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

id0903h5844100

2	Caller’s voice volume too low, or noise interrupts call
Possible DTC	Car-navigation unit		Device code 26/error code 81
Possible cause	•  Malfunction in the microphone related parts ―  Open or short circuit in the wiring harness between the microphone and the Bluetooth unit ―  Microphone malfunction ―  Poor connection in the connector •  Malfunction in the Hang-up/Pick-up/Talk switch ―  Hang-up/Pick-up/Talk switch malfunction ―  Open or short circuit in the wiring harness between the Hang-up/Pick-up/Talk switch and the car-navigation unit ―  Poor connection in the connector •  Bluetooth unit does not receive the vehicle speed signal ―  CAN communication error •  Malfunction in the audio system ―  Steering switch (+) and/or related circuit malfunction •  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 malfunction •  Problem in the cellular phone ―  Vehicle is in a place where signal transmission is weak ―  Bluetooth does not operate ―  A cellular phone other than a Hands-free telephone system-enabled models is used.

Diagnostic procedure

STEP	INSPECTION		ACTION
1	•  Verify if the customer’s cellular phone is a Hands-free telephone system-enabled model by referring to following URL. ―  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.
		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.
		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)
		No	Go to the next step.
4	•  Perform the audio system on-board diagnostic. •  Is device code26, error code 81 displayed?	Yes	Inspect and repair the audio system CAN communication.
		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 microphone terminal F and Bluetooth unit terminal E •  Are the harnesses and connector connections normal?	Yes	Go to the next step.
		No	Repair or replace malfunctioning parts.
6	•  Inspect the following switches. (See STEERING SWITCH INSPECTION.) ―  Hang-up switch ―  Pick-up switch ―  Talk switch •  Are the switches normal?	Yes	Go to the next step.
		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 car-navigation unit (24-pin) terminal 1P and steering switch terminal H •  Are the harnesses and connector connections normal?	Yes	Go to the next step.
		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.
		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.
		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.)
		No	Troubleshooting is completed. (The microphone is malfunctioning.)