2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Telematics Communication Unit Removal/Installation

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
  2. Remove the following parts.
    1. Shift panel (See SHIFT PANEL REMOVAL/INSTALLATION .)
    2. Front console box (See FRONT CONSOLE BOX REMOVAL/INSTALLATION .)
    3. Passenger-side front scuff plate (See FRONT SCUFF PLATE REMOVAL/INSTALLATION .)
    4. Passenger-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
    5. Passenger-side decoration panel (See DECORATION PANEL REMOVAL/INSTALLATION .)
    6. Glove compartment (without passenger-side knee air bag module) (See GLOVE COMPARTMENT REMOVAL/INSTALLATION .)
    7. Dashboard under cover (See DASHBOARD UNDER COVER REMOVAL/INSTALLATION .)
    8. Passenger side lower panel (See LOWER PANEL REMOVAL/INSTALLATION (US) .)
  3. Remove the bolts.
    Fig 1: Telematics Communication Unit Bolts With Torque Specification
    G13179988Courtesy of MAZDA MOTORS CORP.
  4. Remove the wiring harness clip.
    G13179989Courtesy of MAZDA MOTORS CORP.
  5. Move the telematics communication unit in the direction of the arrow shown in the figure.
  6. Disconnect the connectors.
    G13179990Courtesy of MAZDA MOTORS CORP.
  7. Remove the telematics communication unit.
  8. Install in the reverse order of removal.
  9. If the telematics communication unit is replaced, perform the following procedure.
    1. Switch the ignition ON (engine off) to complete global central configuration (GCC) for the telematics communication unit.
    2. Clear the DTC. (See CLEARING DTC .)
    3. Cancel connected vehicle maintenance mode. (See SERVICE CAUTIONS FOR VEHICLES WITH TELEMATICS COMMUNICATION SYSTEM (US) .)
    4. Perform the telematics communication unit initial setting. (See TELEMATICS COMMUNICATION UNIT INITIAL SETTING .)
    5. Switch the ignition OFF and wait for 15 min or more.
    NOTE:
    • It takes approx. 15 min to complete the communication processing for the telematics communication system.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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