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

id0903h5844000

1

Hands-free telephone system does not receive/transmit calls, does not connect

Possible DTC

Using the M-MDS

U0498:68, B116A:12, B116A:16, B116A:13, B1134:23

Without using M-MDS (On-board diagnostic test mode)

26:Er81, 26:Er82, 26:Er83, 26:Er84, 26:Er85
Possible cause
•  Malfunction in steering switch related parts
―  Open or short circuit in the wiring harness between the Hang-up/Pick-up/Talk/Hands-free switch and Bluetooth unit
―  CAN communication error between the audio unit and Bluetooth unit
―  Hang-up/Pick-up/Talk/Hands-free switch malfunction
―  Poor connection of the connector
•  Malfunction in microphone related parts
―  Open or short circuit in the wiring harness between the microphone and Bluetooth unit
―  Microphone malfunction
―  Poor connection of the connector
•  Malfunction in audio system
―  Open or short circuit in the wiring harness between the Bluetooth unit and the speaker through the audio amplifier (with Bose® system)
―  Open or short circuit in the wiring harness between the Bluetooth unit and the speaker through the audio unit (without Bose®)
―  Poor connection of the connector
•  Bluetooth unit does not respond
―  Bluetooth unit malfunction
―  Open or short circuit in the wiring harness between the Bluetooth unit and the audio unit (without Bose® system)
―  Open or short circuit in the wiring harness between the Bluetooth unit and the audio amplifier (with Bose® system)
―  Open or short circuit in the wiring harness of the Bluetooth unit power supply or ground circuit
―  Poor connection of the connector
•  Problem in cellular phone
―  Cellular phone does not set up to Bluetooth system
―  Cellular phone does not operate (low battery voltage, power off)
―  Cellular phone is outside of the signal transmission area
―  Bluetooth does not operate
―  A cellular phone other than a Hands-free telephone system-enabled models is used.


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
•  Verify if the customer’s cellular phone is a Hands-free telephone system-enabled model.
•  Is the customer’s cellular phone a Hands-free telephone system-enabled model?
Yes
Go to the next step.
No
Explain to the customer that the customer’s cellular phone is not a Hands-free telephone system-enabled model.
2
•  Verify that the cellular phone is communicating with the Bluetooth unit.
•  Does the cellular phone connect to the Bluetooth unit via Bluetooth when the Hands-free telephone system is activated?
Yes
Enter a cellular phone signal transmission area and reinspect the Bluetooth system operation.
No
Go to the next step.
3
•  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 Bluetooth system operation.
No
Go to the next step.
4
•  Does the cellular phone set up to the Bluetooth unit?
Yes
Set up the cellular phone to the Bluetooth unit.
No
Go to the next step.
5
•  Is the audio system sound output normal?
Yes
Go to the next step.
No
Perform the audio system troubleshooting procedure.
6
•  Perform the Bluetooth system (hands-free telephone (HF/TEL) system) DTC inspection.
•  Are the following DTC displayed?
―  B116A:12/26:Er82
―  B116A:16/26:Er83
―  B116A:13/26:Er84
Yes
Go to the next step.
No
Go to Step 8.
7*
•  Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections.
―  Between microphone terminal A and Bluetooth unit terminal A
―  Between microphone terminal B and Bluetooth unit terminal B
―  Between microphone terminal C and Bluetooth unit terminal C
―  Between microphone terminal D and Bluetooth unit terminal D
―  Between microphone terminal E and Bluetooth unit terminal E
•  Are the harnesses and connector connections normal?
Yes
Replace the microphone.
(See MICROPHONE REMOVAL/INSTALLATION.)
No
Repair or replace malfunctioning parts.
8
•  Perform the Bluetooth system (hands-free telephone (HF/TEL) system) DTC inspection.
•  Is U0498:68/26:Er81 displayed?
Yes
Inspect and repair the audio system CAN communication.
No
Go to the next step.
9
•  Inspect the Hang-up/Pick-up/Talk/Hands-free switch.
•  Is the Hang-up/Pick-up/Talk/Hands-free switch normal?
Yes
Go to the next step.
No
Replace the steering switch.
(See STEERING SWITCH REMOVAL/INSTALLATION.)
10*
•  Inspect for open or short circuits in the following wiring harnesses and connectors, and inspect the connector connections.
―  Between steering switch terminal I and audio unit (24-pin) terminal 1P
―  Between steering switch terminal N and Bluetooth unit (28-pin) terminal F
―  Between audio unit (24-pin) terminal 1O and Bluetooth unit (28-pin) terminal Y
―  Between audio unit (24-pin) terminal 1Q and Bluetooth unit (28-pin) terminal Z
•  Are the harnesses and connector connections normal?
Yes
Go to the next step.
No
Repair or replace malfunctioning parts.
11
•  Call the hands-free cell phone using another cellular phone.
•  Do the same symptoms appear?
Yes
Replace the Bluetooth unit.
(See Bluetooth UNIT REMOVAL/INSTALLATION.)
No
The cellular phone Bluetooth system is malfunctioning.