2012 Mazda 3 L4-2.5LFACTORY OEM SERVICE PROCEDURE

Relay Box: Service and Repair





RELAY BLOCK REMOVAL/INSTALLATION [WITH ADVANCED KEYLESS ENTRY AND PUSH BUTTON START SYSTEM]

1. Disconnect the negative battery cable. Removal and Replacement Removal and Replacement Removal and Replacement

2. Remove the following parts:
a. Driver-side front scuff plate Front Scuff Plate Removal/Installation

b. Driver-side front side trim Front Side Trim Removal/Installation

c. Hood release lever Service and Repair

d. Upper panel Upper Panel Removal/Installation

e. Shift knob (MTX) Manual Transaxle Shift Mechanism Removal/Installation [G66M-R]

f. Selector lever knob (ATX) Automatic Transaxle Shift Mechanism Removal/Installation

g. Shift panel Shift Panel Removal/Installation

h. Side wall Side Wall Removal/Installation

i. Console Console Removal/Installation

j. Lower panel Lower Panel Removal/Installation

k. Knee bolster Knee Bolster Removal/Installation

3. Remove the nut and clip.

Factory service manual diagram





4. Disconnect the connectors.

Factory service manual diagram





5. Remove the nut and clip.

Factory service manual diagram





6. Remove the relay block from the bracket.

7. Install in the reverse order of removal.

Factory Service Tools

Use the Manual With the Right Hardware

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

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When to See a Mechanic

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

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

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