LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2019 >> 3 Base, 4D Sedan >> Repair and Diagnosis >> Electrical >> Body Electrical >> MAZDA Connect - Introduction >> Entertainment System (E) >> Communication function
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Communication function

SMS (Short Message Service) 

Bluetooth® (Hands-Free) function 



SMS (Short Message Service) 

  1. When the CMU receives the operation signal/detects the switch operation, it sends (1) a control signal to a mobile device such as a Bluetooth®-enabled mobile phone or a Smartphone.
  2. When the mobile device such as a Smartphone or a Bluetooth®-enabled device receives the control signal, the digital data is sent (2) to the CMU.
  3. The CMU converts the video signal of the digital data to a GMSL signal and sends (3) the GMSL signal to the center display.
  4. The center display indicates the SMS information based on the received GMSL signal.
G13180383Courtesy of MAZDA MOTORS CORP.

Bluetooth® (Hands-Free) function (incoming calls) 

  1. When an incoming call is received, a mobile device such as a Bluetooth®-enabled mobile phone or a Smartphone sends (1) the incoming call signal to the CMU.
  2. When the CMU receives the incoming call signal, it sends (2) the incoming call pop-up screen display signal (GMSL signal) to the center display.
  3. When the center display receives the incoming call pop-up screen display signal (GMSL signal), it displays (3) the incoming call pop-up screen.
  4. If the pick-up button on the steering switch is pressed while the incoming call pop-up screen is displayed, the CMU detects (4) the steering switch operation.
  5. When the CMU detects the steering switch operation, it sends (5) the call answer signal to a mobile device such as a Bluetooth®-enabled mobile phone or a Smartphone, and the call is initiated.
  6. The mobile device, such as a Bluetooth®-enabled mobile phone or a Smartphone, sends (6) the received audio signal to the CMU, and the signal is output (6) from the speakers via the audio amplifier.
  7. The voice recognition-use microphone sends the send audio signal of the user to the CMU, and the CMU sends (7) the received send audio signal to a mobile device such as a Bluetooth®-enabled mobile phone or a Smartphone.
    NOTE:
    • When the call initiates, the incoming call pop-up screen switches to the call screen.
G13180384Courtesy of MAZDA MOTORS CORP.

Bluetooth® (Hands-Free) function (outgoing calls) 

  1. When the talk button on the steering switch is pressed, the CMU detects (1) the steering switch operation.
  2. When the CMU detects the steering switch operation, it sends (2) a guidance audio signal to the audio amplifier.
  3. The audio amplifier sends (3) the guidance audio signal to the speakers and the speakers output (3) the guidance audio.
  4. The voice recognition-use microphone converts the words (voice commands) produced by the user after the guidance audio output to an audio signal and sends it to the CMU.
  5. When the CMU receives the audio signal from the voice recognition-use microphone, it sends (5) an outgoing call signal to a mobile device such as a Bluetooth®-enabled mobile phone or a Smartphone, and the call is initiated.
  6. The mobile device, such as a Bluetooth®-enabled mobile phone or a Smartphone, sends (6) the received audio signal to the CMU, and the signal is output (6) from the speakers via the audio amplifier.
  7. The voice recognition-use microphone sends the send audio signal of the user to the CMU, and the CMU sends (7) the received send audio signal to a mobile device such as a Bluetooth®-enabled mobile phone or a Smartphone.
G13180385Courtesy of MAZDA MOTORS CORP.