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

id0903h4844200

3

Addressee’s voice volume too low, or noise interrupts call
Possible DTC
26:Er81, 26:Er86
Possible cause
•  Malfunction in the audio system
―  Open or short circuit in the wiring harness between the HF/TEL unit and the speaker through the audio unit/car-navigation unit and the audio amplifier (with Bose®)
―   Open or short circuit in the wiring harness between the HF/TEL unit and the speaker through the audio unit/car-navigation unit (without Bose®)
―  steering switch (+) and/or related circuit malfunction
―  Poor connection in the connector
•  HF/TEL unit malfunction
•  Problem in the cellular phone
―  Vehicle is in a place where signal transmission is weak
―  Bluetooth does not operate


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
•  Is the audio system sound output normal?
Yes
Go to the next step.
No
Perform the audio system troubleshooting procedure.
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
•  Perform the hands-free telephone (HF/TEL) system on-board diagnostic.
•  Is 26:Er81 displayed?
Yes
Inspect and repair the audio system CAN communication.
No
Go to the next step.
4*
•  Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections.
―  Between HF/TEL unit terminal G and audio unit/car-navigation unit (16-pin) terminal B
―  Between HF/TEL unit terminal H and audio unit/car-navigation unit (16-pin) terminal J
―  Between HF/TEL unit terminal L and shield wire
•  Are the harnesses and connector connections normal?
Yes
Go to the next step.
No
Repair or replace malfunctioning parts.
5
•  Make a call with the cellular phone without using HF/TEL system.
•  Does the same symptom appear?
Yes
Cellular phone related problem.
No
Go to the next step.
6
•  Call the hands-free cell phone using another cellular phone.
•  Does the same symptom appear?
Yes
Replace the HF/TEL unit.
(See HANDS-FREE TELEPHONE (HF/TEL) UNIT REMOVAL/INSTALLATION.)
No
The cellular phone Bluetooth system is malfunctioning.