2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE

Relay And Fuse Block Removal/Installation: Installation

  1. While pressing the stopper using a tape-wrapped flathead screwdriver in the direction of the arrow (1) shown in the figure, pull the wiring harness in the direction of the arrow (2) shown in the figure to detach the fuse terminal from the stopper.
    G13153377Courtesy of MAZDA MOTORS CORP.
    CAUTION:
    • If terminals are installed incorrectly, it could damage electrical accessories and burn wiring harnesses. When relocating terminals after replacing the relay and fuse block, line up the relay and fuse blocks of old and new 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.
  2. Relocate all relay and fuse terminals to the new relay and fuse block.
    G13153378Courtesy of MAZDA MOTORS CORP.
  3. Install the front wiring harness.
    Fig 1: Relay And Fuse Block, Front Wiring Harness Or Nut With Torque Specification
    G13153379Courtesy of MAZDA MOTORS CORP.
  4. Install the nut.
  5. Insert the front wiring harness connectors into the relay and fuse block.
    G13153380Courtesy of MAZDA MOTORS CORP.
  6. Install the wiring harness clip to the relay and fuse block lower cover No. 2.
    G13153381Courtesy of MAZDA MOTORS CORP.
  7. Insert all of the relay and fuse block middle cover tabs into the relay and fuse block lower cover No. 2.
    G13153382Courtesy of MAZDA MOTORS CORP.
  8. Install the relay and fuse block lower cover No. 2 to the relay and fuse block middle cover.
  9. Insert all of the relay and fuse block middle cover tabs into the relay and fuse block lower cover No. 1.
    G13153383Courtesy of MAZDA MOTORS CORP.
  10. Install the relay and fuse block lower cover No. 1 to the relay and fuse block middle cover.
  11. Install the wiring harness clips.
    G13153384Courtesy of MAZDA MOTORS CORP.
  12. Insert the relay and fuse block into the stud bolts.
    G13153385Courtesy of MAZDA MOTORS CORP.
  13. Install the nuts.
    Fig 2: Relay And Fuse Block Or Nuts With Torque Specification
    G13153386Courtesy of MAZDA MOTORS CORP.
  14. Connect the emission wiring harness connectors.
    G13153387Courtesy of MAZDA MOTORS CORP.
  15. Press the emission wiring harness into the relay and fuse block hook.
    G13153388Courtesy of MAZDA MOTORS CORP.
  16. Install all the relays and fuses.
  17. Install the relay and fuse block upper cover.
    G13153389Courtesy of MAZDA MOTORS CORP.
  18. Install the battery and the battery tray. (See BATTERY REMOVAL/INSTALLATION [SKYACTIV-G 2.0] .)
  19. Install the air cleaner assembly. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G 2.0] .)
  20. Perform the "Verify Relay and Fuse Block Replacement". (See VERIFY RELAY AND FUSE BLOCK REPLACEMENT .)
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.