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
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
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.
•  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.