20 Electrical switch & relay parts are listed for the 2024 Mazda 3, in 10 part types, covering both the 2.0L L4 and the 2.5L L4. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2024 Mazda 3, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. Most of the listed parts are Brake Light Switch (3 parts), Horn Relay (3 parts) and A/C Compressor Relay (2 parts). The other 7 part types cover the remaining 12 parts.
The 2024 Mazda 3 was sold with both the 2.0L L4 and the 2.5L L4. 4 parts fit every engine; the other 16 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2024 Mazda 3 electrical switch & relay parts are STANDARD MOTOR PRODUCTS (12 parts), UAC (3 parts) and WELLS (2 parts), plus 3 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2024 Mazda 3 opens a page with every vehicle that part fits.
A/C Compressor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Functions: Multi-Function Relay | View on Amazon |
This table covers the relays that control the A/C Compressor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
2 A/C Compressor Relay parts for the 2024 Mazda 3 come from STANDARD MOTOR PRODUCTS.
Listed part numbers: STANDARD MOTOR PRODUCTS RY805T and STANDARD MOTOR PRODUCTS RY805.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 2.5L L4 | SW11649C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Transducer | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: UAC SW11649C.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 2.5L L4 | RE8414 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Fits or 3 Base ModelGT Model | View on Amazon |
| UAC Fits: 2.5L L4 | RE8415 | 🇨🇦 CA | 3 Base ModelGS Model or GX Model | View on Amazon |
This table covers the relays that control the A/C System circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
2 A/C System Relay parts for the 2024 Mazda 3 come from UAC.
Part numbers include UAC RE8414 and UAC RE8415.
Body Wiring Harness Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Functions: Multi-Function Relay | View on Amazon |
This table covers the relays that control the Body Wiring Harness circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
2 Body Wiring Harness Relay parts for the 2024 Mazda 3 come from STANDARD MOTOR PRODUCTS.
Listed part numbers: STANDARD MOTOR PRODUCTS RY805T and STANDARD MOTOR PRODUCTS RY805.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2024 3 engines | 920493 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Fits: all 2024 3 engines | 2012742 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Fits: 2.5L L4 | 010966711 | 🇺🇸 US | 4-pin connector | View on Amazon |
This table covers the pedal-mounted switch that turns on the brake lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 Brake Light Switch parts for the 2024 Mazda 3 come from 3 brands — DORMAN, BECK/ARNLEY and HELLA. 2 parts fit every engine; the other 1 is engine-specific.
The Economy section lists 1 option from DORMAN — the catalog's value-priced group. DORMAN 920493 is listed in this group.
In the Standard Replacement grade, BECK/ARNLEY supplies 1 part: built to original-equipment specification. A representative part number is BECK/ARNLEY 2012742.
1 further part sits outside the graded sections, with the same engine-level match.
This group includes DORMAN 920493, BECK/ARNLEY 2012742 and HELLA 010966711.
Fog / Driving Lamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Functions: Multi-Function Relay | View on Amazon |
This table covers the relays that control the Fog / Driving Lamp circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
2 Fog / Driving Lamp Relay parts for the 2024 Mazda 3 come from STANDARD MOTOR PRODUCTS.
This group includes STANDARD MOTOR PRODUCTS RY805T and STANDARD MOTOR PRODUCTS RY805.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Functions: Multi-Function Relay | View on Amazon |
| WELLS Fits: all 2024 3 engines | 1R2324 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
This table covers the relays that control the Horn circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
3 Horn Relay parts are listed for the 2024 Mazda 3, from STANDARD MOTOR PRODUCTS and WELLS. 1 part fits every engine; the other 2 are engine-specific.
Listed part numbers: STANDARD MOTOR PRODUCTS RY805T, STANDARD MOTOR PRODUCTS RY805 and WELLS 1R2324.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2024 3 engines | 1S16076 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 3 Base Model | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
This group shows a single part: WELLS 1S16076.
Radiator Fan Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Functions: Multi-Function Relay | View on Amazon |
This table covers the relays that control the Radiator Fan circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
STANDARD MOTOR PRODUCTS supplies both parts for the 2024 Mazda 3.
Listed part numbers: STANDARD MOTOR PRODUCTS RY805T and STANDARD MOTOR PRODUCTS RY805.
Starter Motor Control Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4 | RY805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Functions: Multi-Function Relay | View on Amazon |
This table covers the relays that control the Starter Motor Control circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
STANDARD MOTOR PRODUCTS supplies both parts for the 2024 Mazda 3.
Part numbers include STANDARD MOTOR PRODUCTS RY805T and STANDARD MOTOR PRODUCTS RY805.
Buying Electrical Switch & Relay Parts for a 2024 Mazda 3
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Some electrical switch & relay parts fit every engine; others are engine-specific. Each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Brake Light Switch and Horn Relay .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2024 Mazda 3?
Our catalog currently lists 20 electrical switch & relay parts for the 2024 Mazda 3 across 10 subcategories and 6 brands, covering both the 2.0L L4 and the 2.5L L4. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2024 Mazda 3 engines?
Some do. 4 parts fit every engine; the other 16 are engine-specific. Each row (and the filter at the top) shows which. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical switch & relay problems on a 2024 Mazda 3?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2024 Mazda 3 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2024 Mazda 3?
First match the engine — each row shows which engine(s) the part fits. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2024 Mazda 3
Electrical Switch & Relay Parts for Other Mazda 3 Years
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