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Electrical Supply Unit (ESU) Removal/Installation

  1. Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION .)
  2. Remove the following parts:
    1. Selector lever knob (AT) (See AUTOMATIC TRANSMISSION SHIFT MECHANISM REMOVAL/INSTALLATION .)
    2. Shift lever knob (MT)
    3. Shift panel component (See SHIFT PANEL REMOVAL/INSTALLATION .)
    4. Upper panel (See UPPER PANEL REMOVAL/INSTALLATION .)
    5. Parking brake lever boot panel (See PARKING BRAKE LEVER BOOT PANEL REMOVAL/INSTALLATION .)
    6. Rear console (See REAR CONSOLE REMOVAL/INSTALLATION .)
    7. Front console panel (See FRONT CONSOLE PANEL REMOVAL/INSTALLATION .)
    8. Front console component (See FRONT CONSOLE REMOVAL/INSTALLATION .)
    9. Driver-side scuff plate (See SCUFF PLATE REMOVAL/INSTALLATION .)
    10. Driver-side front side trim (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
    11. Driver-side A-pillar trim (See A-PILLAR TRIM REMOVAL/INSTALLATION .)
    12. Hood release lever (See HOOD RELEASE LEVER AND RELEASE CABLE REMOVAL/INSTALLATION .)
    13. Driver-side lower panel (See DRIVER-SIDE LOWER PANEL REMOVAL/INSTALLATION .)
    14. Accelerator pedal (See ACCELERATOR PEDAL REMOVAL/INSTALLATION [SKYACTIV-G 2.0] .)
  3. Pull back the floor covering to a position which allows for the removal of the electrical supply unit (ESU). (See FLOOR COVERING REMOVAL/INSTALLATION .)
  4. Remove the nuts.
    Fig 1: Electrical Supply Unit Cover Nuts With Torque Specification
    G14603556Courtesy of MAZDA MOTORS CORP.
  5. Remove the vehicle wiring harness from the hook by pulling it in the direction of the arrow.
    G14603557Courtesy of MAZDA MOTORS CORP.
  6. Remove the electrical supply unit (ESU) cover.
  7. Perform the following procedure to allow the backup power supply to deplete its stored power.
    NOTE:
    • While the power stored in the backup power supply is being depleted, the door latch and lock actuator does not operate. This does not indicate an improper procedure. Continue to perform the procedure.
    • After performing Step  3 and the door latch and lock actuator starts to operate, the door lock switch (driver's side) no longer needs to be operated.
    1. Close the front door (driver's side).
    2. Open the front door (driver's side).
    3. Within 30 s after performing Step  2, press and hold the unlock side of the door lock switch (driver's side) for 5 s or more.
    4. Wait until the door latch and lock actuator stops.
  8. Disconnect the connectors.
    G14603558Courtesy of MAZDA MOTORS CORP.
  9. While pressing the tabs of the electrical supply unit (ESU) in the direction of arrow (1) shown in the illustration simultaneously, pull them in the direction of arrow (2) to detach the tabs from the body.
    G14603559Courtesy of MAZDA MOTORS CORP.
  10. Pull the electrical supply unit (ESU) in the direction of the arrow shown in the illustration and detach the hook from the body.
    G14603560Courtesy of MAZDA MOTORS CORP.
  11. Remove the electrical supply unit (ESU).
  12. Install in the reverse order of removal.
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