No.2 CALLER'S VOICE VOLUME TOO LOW, OR NOISE INTERRUPTS CALL [Bluetooth SYSTEM (HANDS-FREE TELEPHONE (HF/TEL) SYSTEM)]SM2446160
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

Using the M-MDS

U0498:68

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

Audio unit

26:Er81

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 audio unit/car-navigation unit (without integrated multi information display)
― 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

• 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 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 U0498:68/26:Er81/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 E (L.H.D.)/F (R.H.D.) 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 audio unit/car-navigation unit (without integrated multi information display) (24-pin) terminal 1N and steering switch terminal G
• 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.)