HandsFreeLink System Description - Overview

The HandsFreeLink^(R) (HFL) automatically connects (pairs) to a linked phone when the vehicle is in the ACCESSORY or ON mode. The HFL also synchronizes with the paired cell phone's phone book to automatically update any changes. Depending on the functions of the cell phone, the automatic update may not work.

HandsFreeLink Control Unit 

The audio unit or the audio-navigation unit builds in the HFL circuit, HFL microphone^*1 , and the Bluetooth transceiver. The HFL switch^*2 controls the HFL function using the hard wire.

General Operation 

The HFL switch on the steering wheel is used to answer incoming calls, to make outgoing calls, or to end a call. The signal is sent to the audio unit or the audio-navigation unit.

The microphone picks up the driver's voice, and sends the signal to the audio unit or the audio-navigation unit. The signal is then sent from the Bluetooth transceiver to the cell phone.

The caller's voice signal is sent from the cell phone to the Bluetooth transceiver. The audio unit or the audio-navigation unit outputs the voice signal through the front door speakers.

Muting Logic 

When you are talking on the mobile phone using the HFL system, the front speakers provide the HFL sound and the rear speakers are muted.

Fan Mute Operation (With Climate Control) 

When the voice recognition is in use, the audio-navigation unit sends the fan mute signal to the climate control unit via the B-CAN. The blower fan operating voltage may be reduced depending on the current fan speed.

Voice Tag Function (With Display Audio) 

The audio unit can save voice tag to memory for making a call by voice recognition possible. The voice tag saved at the audio unit is related with Speed Dial.

Short Message Service (With Display Audio) 

The audio unit or the audio-navigation unit processes the short message service (SMS) data sent from the cell phone. The text message information is displayed on the display.