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
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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 ― Audio control switch and/or related circuit malfunction ― Poor connection in the connector • HF/TEL unit does not receive the vehicle speed signal ― CAN communication error • 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
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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 audio control switch? | Yes | Go to the next step.
No | Inspect and repair the audio control switch and related wiring harness.
3 | • Perform the audio 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 (24-pin) terminal G and audio unit (16-pin) terminal 2B ― Between HF/TEL unit (24-pin) terminal H and audio unit (16-pin) terminal 2J ― Between HF/TEL unit (24-pin) 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.