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
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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 • 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

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* | • 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 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.
5* | • Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections. ― Between microphone terminal A and audio unit terminal 2L (without car navigation system)/Bluetooth unit terminal 1A (with car navigation system) ― Between microphone terminal B and audio unit terminal 2N (without car navigation system)/Bluetooth unit terminal 1B (with car navigation system) ― Between microphone terminal C and audio unit terminal 2R ― Between microphone terminal D and audio unit terminal 2P ― Between microphone terminal E and audio unit terminal 2T • 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 microphone and audio unit/buletooth 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.
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.
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 clock spring terminal F and audio unit terminal 1H ― Between clock spring terminal H and audio unit terminal 1P • 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 clock spring 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.
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.)