Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2021 Mazda 3 BaseFACTORY OEM SERVICE PROCEDURE

Keyless Receiver Removal/Installation: Hatchback-5HB

Disconnect the negative battery terminal. (See NEGATIVE BATTERY TERMINAL DISCONNECTION/CONNECTION (US) .)
Remove the following parts:
1. Rear package tray (See REAR PACKAGE TRAY REMOVAL/INSTALLATION .)
2. Trunk side upper trim (LH) (See TRUNK SIDE UPPER TRIM REMOVAL/INSTALLATION .)
3. C-pillar trim (LH) (See C-PILLAR TRIM REMOVAL/INSTALLATION .)
Disconnect the connector.

Fig 1: Keyless Receiver Bolt With Torque Specification
Courtesy of MAZDA MOTORS CORP.
Remove the bolt.
Remove the keyless receiver.
Install in the reverse order of removal.

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.