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
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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

• 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
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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.