No.3 ADDRESSEE'S VOICE VOLUME TOO LOW, OR NOISE INTERRUPTS CALL [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)]

id0903h5844200

3	Addressee’s voice volume too low, or noise interrupts call
Possible DTC	Using the M-MDS	—
	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 •  The volume of the Hands-free telephone system is set at a low level or zero •  Bluetooth unit does not receive the vehicle speed signal ―  CAN communication error •  Malfunction in the audio system ―  Poor connection in the connector ―  Open or short circuit in the wiring harness between the Bluetooth unit and the speaker through the audio amplifier (with Bose® system) ―   Open or short circuit in the wiring harness between the Bluetooth unit and the speaker through the audio unit (without Bose®) ―  Steering switch (+) and/or related circuit malfunction •  Bluetooth unit malfunction

Diagnostic procedure

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.
		No	Explain to the customer that the customer’s cellular phone is not a Hands-free telephone system-enabled model.
2	•  Verify the volume setting of the Hands-free telephone system. •  Is the volume set at a low level or zero?	Yes	•  Verify if the malfunction symptom is eliminated after the volume is set to a higher level. •  If the malfunction is not resolved, go to the next step. •  If the malfunction is resolved, explain to the customer that the malfunction occurred due to an inappropriate volume setting.
		No	Go to the next step.
3	•  Is the audio system sound output normal?	Yes	Go to the next step.
		No	Perform the audio system troubleshooting procedure.
4	•  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.
5	•  Perform the Bluetooth system (hands-free telephone (HF/TEL) system) DTC inspection. •   Is 26:Er81 displayed?	Yes	Inspect and repair the audio system CAN communication.
		No	Go to the next step.
6*	•  Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections. ―  Between Bluetooth unit (28-pin) terminal 1I and audio unit (24-pin) terminal 2C ―  Between Bluetooth unit (28-pin) terminal 1J and audio unit (24-pin) terminal 2D ―  Between Bluetooth unit (28-pin) terminal 1M and audio unit (24-pin) terminal 2A ―  Between Bluetooth unit (28-pin) terminal 1N and audio unit (24-pin) terminal 2B •  Are the harnesses and connector connections normal?	Yes	Go to the next step.
		No	If there is a common connector:If there is no common connector: Refer to the wiring diagram and verify whether or not there is a common connector between buletooth unit and audio unit. •  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open or short circuit. •  Repair or replace the malfunctioning part. •  Repair or replace the wiring harness which has an open or short circuit.
7	•  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.
8	•  Call the hands-free cell phone using another cellular phone. •  Does the same symptom appear?	Yes	Replace the Bluetooth unit. (See Bluetooth UNIT REMOVAL/INSTALLATION.)
		No	The cellular phone Bluetooth system is malfunctioning.