Mazda RX-8 Workshop Manual page 3444

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2011 - RX-8 - Body and Accessories
No.2 CALLER'S VOICE VOLUME TOO LOW, OR NOISE INTERRUPTS CALL [HANDS-FREE
TELEPHONE (HF/TEL) SYSTEM]
2 Caller's voice volume too low, or noise interrupts call
Possible DTC 26:Er81
Device code 26/error code 81
Possible
cause
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.
Malfunction in the microphone related parts
Open or short circuit in the wiring harness between the microphone and the
HF/TEL unit
Microphone malfunction
Poor connection in the connector
Malfunction in the mute switch (without car-navigation system)
Mute switch malfunction
Open or short circuit in the wiring harness between the mute switch and the
audio unit
Poor connection in the connector
Malfunction in the voice switch (with car-navigation system)
Voice switch malfunction
Open or short circuit in the wiring harness between the voice switch and the
audio unit
Poor connection in the connector
HF/TEL unit does not receive the vehicle speed signal
CAN communication error
Malfunction in the audio system
Audio steering switch (+) and/or related circuit malfunction