No.1 HANDS-FREE TELEPHONE SYSTEM DOES NOT RECEIVE/TRANSMIT CALLS, DOES NOT CONNECT [HANDS-FREE TELEPHONE (HF/TEL) SYSTEM]

id0903h4844000

1 | Hands-free telephone system does not receive/transmit calls, does not connect
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Possible DTC | 26:Er81, 26:Er82, 26:Er83, 26:Er84, 26:Er85, 26:Er86
Possible cause | • Malfunction in voice recognition/hands-free switch related parts ― Voice recognition/hands-free switch malfunction ― Poor connection in the connector • Malfunction in microphone related parts ― Microphone malfunction ― Poor connection in the connector • Malfunction in audio system ― Open or short circuit in the wiring harness between the HF/TEL unit and the speaker through the audio unit ― Poor connection in the connector • HF/TEL unit does not respond ― HF/TEL unit malfunction ― Open or short circuit in the wiring harness between the HF/TEL unit and the audio unit ― Open or short circuit in the wiring harness of the HF/TEL unit power supply or ground circuit ― Poor connection in the connector • Problem in cellular phone ― Cellular phone does not set up to HF/TEL system ― Cellular phone does not operate (low battery voltage, power off) ― Cellular phone is outside of the signal transmission area ― 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 | • Inspect the cellular phone condition while the hands free phone does not operate. • Can the following conditions be verified? ― Low battery voltage ― Power is off ― Out of signal transmission area | Yes | Enter a cellular phone signal transmission area and reinspect the HF/TEL system operation.
No | Go to the next step.
2 | • Does the cellular phone set up to the HF/TEL unit? | Yes | Set up the cellular phone to the HF/TEL unit.
No | Go to the next step.
3 | • Is the audio system sound output normal? | Yes | Go to the next step.
No | Perform the audio system troubleshooting procedure.
4 | • Perform the audio system on-board diagnostic. • Are the following DTC displayed? ― 26:Er82 ― 26:Er83 ― 26:Er84 | Yes | Go to the next step.
No | Go to the step 6.
5* | • Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections. ― Between microphone terminal A and HF/TEL unit terminal B ― Between microphone terminal B and HF/TEL unit terminal D ― Between microphone terminal C and HF/TEL unit terminal U ― Between microphone terminal E and HF/TEL unit terminal J • Are the harnesses and connector connections normal? | Yes | Replace the microphone. (See MICROPHONE REMOVAL/INSTALLATION.)
No | Repair or replace malfunctioning parts.
6 | • Perform the HF/TEL system on-board diagnostic. (See STARTING PROCEDURE FOR ON-BOARD DIAGNOSTIC TEST MODE [HANDS-FREE TELEPHONE (HF/TEL) SYSTEM].) • Is 26:Er81 displayed? | Yes | Inspect and repair the audio system CAN communication.
No | Go to the next step.
7 | • Inspect the voice recognition/hands-free switch. • Is the voice recognition/hands-free switch normal? (See AUDIO CONTROL SWITCH INSPECTION.) | Yes | Go to the next step.
No | Replace the audio control switch. (See AUDIO CONTROL SWITCH REMOVAL/INSTALLATION.)
8 | • Call the hands free cell phone using another cellular phone. • Do the same symptoms appear? | Yes | Replace the HF/TEL unit. (See HANDS-FREE TELEPHONE (HF/TEL) UNIT REMOVAL/INSTALLATION.)
No | The cellular phone Bluetooth system is malfunctioning.