2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Fuse Block Removal/Installation: Installation

  1. Move the flathead screwdriver in the direction of the arrow (1) shown in the figure, and pull the wiring harness in the direction of the arrow (2) while pressing the stopper to detach the fuse terminal from the stopper.
    G13561127Courtesy of MAZDA MOTORS CORP.
  2. Relocate all fuse terminals to the new fuse block.
    CAUTION:
    • If terminals are installed incorrectly, it could damage electrical accessories and burn wiring harnesses. When relocating terminals after replacing the fuse block, line up the fuse blocks of old and news parts and always verify each of the wiring harnesses in the wiring diagram so that the installation positions are correct.
    • A terminal disconnection could cause electronic components and the system to not operate normally due to poor contact. After terminal relocation, lightly pull the wiring harnesses to verify that they cannot be pulled out.
    G11426325Courtesy of MAZDA MOTORS CORP.
  3. Install the wiring harness clip tabs to the fuse block.
    G13561129Courtesy of MAZDA MOTORS CORP.
  4. Install the cover.
    G13561130Courtesy of MAZDA MOTORS CORP.
  5. Install the fuse block tab to the bracket.
    G13561131Courtesy of MAZDA MOTORS CORP.
  6. Connect the wiring harness connectors.
    G13561132Courtesy of MAZDA MOTORS CORP.
  7. Install the bands shown in the figure.
    G13179881Courtesy of MAZDA MOTORS CORP.
  8. Install all the fuses.
  9. Install the following parts:
    1. Front side trim (LH). (See FRONT SIDE TRIM REMOVAL/INSTALLATION .)
    2. Front scuff plate (LH). (See FRONT SCUFF PLATE REMOVAL/INSTALLATION .)
  10. Perform the "Verify Fuse Block Replacement". (See VERIFY FUSE BLOCK REPLACEMENT .)
  11. Connect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Factory Service Tools

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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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