The 2021 Nissan Frontier has 53 electrical switch & relay parts with verified fitment on this page — 12 part types and 15 brands, covering all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6). Each part includes a manufacturer part number and application notes.
The switch and relay system on the 2021 Nissan Frontier covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are Power Window Switch (11 parts), Brake Light Switch (9 parts) and Oil Pressure Sender / Switch (6 parts). The other 9 part types cover the remaining 27 parts.
The 2021 Nissan Frontier was sold with 3 engines. 37 parts fit every engine; the other 16 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Nissan Frontier electrical switch & relay parts are WELLS (21 parts), STANDARD MOTOR PRODUCTS (7 parts) and DORMAN (5 parts), plus 12 more brands. Quality grades include Standard Replacement and Economy.
8 parts on this 2021 Nissan Frontier page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including UAC SW10087C (A/C Refrigerant Pressure Switch) and STANDARD MOTOR PRODUCTS SLS370T (Brake Light Switch). Click any part number to see every vehicle that part fits.
4WD Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 Frontier engines | 1S14159 | 🇺🇸 US 🇲🇽 MX | View on Amazon |
This table covers the 4WD switches. 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: WELLS 1S14159.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Popular Fits: all 2021 Frontier engines | SW10087C | 🇺🇸 US 🇲🇽 MX | Pressure Transducer | View on Amazon |
| FACET Fits: all 2021 Frontier engines | 250073 | 🇺🇸 US 🇲🇽 MX | View on Amazon | |
| FOUR SEASONS Fits: all 2021 Frontier engines | 20994 | 🇺🇸 US 🇲🇽 MX | Pressure Switch | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S15878 | 🇺🇸 US 🇲🇽 MX | Mounting Bracket Included: No | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S16052 | 🇺🇸 US 🇲🇽 MX | CUT-OFF | 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.
5 A/C Refrigerant Pressure Switch parts for the 2021 Nissan Frontier come from 4 brands — WELLS, UAC, FACET and 1 other brand. The "Popular" part is UAC SW10087C. Every part fits all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6).
Listed part numbers: UAC SW10087C, FACET 250073 and FOUR SEASONS 20994, plus the other parts above.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 3.8L V6 | RE8417 | 🇺🇸 US | View on Amazon | |
| UAC Fits: 3.8L V6 | RE8417C | 🇺🇸 US | 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 2021 Nissan Frontier come from UAC.
Listed part numbers: UAC RE8417 and UAC RE8417C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 2021 Frontier engines | SLS370T | 🇺🇸 US 🇲🇽 MX | T-Series | View on Amazon |
| BWD/NIEHOFF Fits: 3.8L V6 | SL2110 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DORMAN Fits: all 2021 Frontier engines | 901276 | 🇺🇸 US 🇲🇽 MX | View on Amazon | |
| HOLSTEIN Fits: all 2021 Frontier engines | 2BLS0014 | 🇺🇸 US 🇲🇽 MX | Automatic trans. | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: all 2021 Frontier engines | SLS370 | 🇺🇸 US 🇲🇽 MX | Automatic trans. | View on Amazon |
| BECK/ARNLEY Fits: 3.8L V6 | 2011962 | 🇺🇸 US | View on Amazon | |
| UNITED MOTOR PRODUCTS Fits: all 2021 Frontier engines | SW408 | 🇺🇸 US 🇲🇽 MX | Automatic trans. | View on Amazon |
| WELLS Fits: 2.5L L4, 2.5L L4 DIESEL Turbocharged | 1S11810 | 🇲🇽 MX | Manual trans. | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S15192 | 🇺🇸 US 🇲🇽 MX | Automatic Trans | 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.
9 Brake Light Switch parts for the 2021 Nissan Frontier come from 7 brands — STANDARD MOTOR PRODUCTS, WELLS, BWD/NIEHOFF and 4 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS SLS370T. 6 parts fit every engine; the other 3 are engine-specific.
The Economy section lists 4 options from STANDARD MOTOR PRODUCTS, BWD/NIEHOFF, DORMAN and 1 other brand — the catalog's value-priced group. STANDARD MOTOR PRODUCTS SLS370T is listed in this group.
In the Standard Replacement grade, WELLS, STANDARD MOTOR PRODUCTS, BECK/ARNLEY and 1 other brand supply 5 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS SLS370.
This group includes STANDARD MOTOR PRODUCTS SLS370T, BWD/NIEHOFF SL2110 and DORMAN 901276 and the remaining parts above.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 Frontier engines | 1S17983 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17984 | 🇺🇸 US 🇲🇽 MX | with Fog Lights, without Automatic Headlights, with Audio | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17985 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
This table covers the dimmer switches that select headlamp high and low beam. 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.
WELLS supplies the 3 Dimmer Switch parts for the 2021 Nissan Frontier. All of them fit every engine offered in the 2021 Frontier.
Part numbers include WELLS 1S17983, WELLS 1S17984 and WELLS 1S17985.
Fog / Driving Lamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 Frontier engines | 1S17984 | 🇺🇸 US 🇲🇽 MX | without Automatic Headlightswith Sound | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17985 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
This table covers the Fog / Driving Lamp switches. 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.
WELLS supplies both parts for the 2021 Nissan Frontier. All of them fit every engine offered in the 2021 Frontier.
Listed part numbers: WELLS 1S17984 and WELLS 1S17985.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 Frontier engines | 1S17983 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17984 | 🇺🇸 US 🇲🇽 MX | with Fog Lights, without Automatic Headlights, with Audio | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17985 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
This table covers the column or dash switches that control the exterior 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.
WELLS supplies the 3 Headlamp Switch parts for the 2021 Nissan Frontier. All of them fit every engine offered in the 2021 Frontier.
Part numbers include WELLS 1S17983, WELLS 1S17984 and WELLS 1S17985.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | HR159T | 🇺🇸 US 🇲🇽 MX | T-Series | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | HR159 | 🇺🇸 US 🇲🇽 MX | View on Amazon | |
| WELLS Fits: all 2021 Frontier engines | 1R1564 | 🇺🇸 US 🇲🇽 MX | Mounting Hardware Included: No | 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 2021 Nissan Frontier, from STANDARD MOTOR PRODUCTS and WELLS. All of them fit every engine offered in the 2021 Frontier.
Listed part numbers: STANDARD MOTOR PRODUCTS HR159T, STANDARD MOTOR PRODUCTS HR159 and WELLS 1R1564.
Ignition Starter Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA Fits: 2.5L L4, 2.5L L4 DIESEL Turbocharged | NI1317189 | 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 2.5L L4, 2.5L L4 DIESEL Turbocharged | US362 | 🇲🇽 MX | Finish: PlasticTerminal Gender: Male | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| AUTOTECNICA Fits: 3.8L V6 | NI1317189 | 🇺🇸 US | View on Amazon | |
| DORMAN Fits: all 2021 Frontier engines | 989102 | 🇺🇸 US 🇲🇽 MX | Body code D40 | View on Amazon |
| SKP Fits: 3.8L V6 | SKUS362 | 🇺🇸 US | View on Amazon |
This table covers the ignition switches that feed the starter 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.
5 Ignition Starter Switch parts are listed for the 2021 Nissan Frontier, from AUTOTECNICA, STANDARD MOTOR PRODUCTS, DORMAN and 1 other brand. 1 part fits every engine; the other 4 are engine-specific.
Economy: 1 part, from AUTOTECNICA. A representative part number is AUTOTECNICA NI1317189.
The Standard Replacement section: 1 option from STANDARD MOTOR PRODUCTS. STANDARD MOTOR PRODUCTS US362 is listed in this group.
3 ungrouped parts are not assigned to a grade, with the same engine-level match.
Listed part numbers: AUTOTECNICA NI1317189 and STANDARD MOTOR PRODUCTS US362, plus the other parts above.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 3.8L V6 | 2OPS0052 | 🇺🇸 US | View on Amazon | |
| WALKER PRODUCTS Fits: 3.8L V6 | 2561069 | 🇺🇸 US | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY Popular Fits: 3.8L V6 | 2011773 | 🇺🇸 US | with Light | View on Amazon |
| WELLS Popular Fits: 3.8L V6 | 1S6801 | 🇺🇸 US | View on Amazon | |
| GPD Fits: 3.8L V6 | 1815408 | 🇺🇸 US | with Black Connector | View on Amazon |
| ROSTRA Fits: 3.8L V6 | 501245 | 🇺🇸 US | 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.
6 Oil Pressure Sender / Switch parts for the 2021 Nissan Frontier come from 6 brands — HOLSTEIN, WALKER PRODUCTS, BECK/ARNLEY and 3 other brands. The "Popular" part is BECK/ARNLEY 2011773.
The Economy section: 2 options from HOLSTEIN and WALKER PRODUCTS. HOLSTEIN 2OPS0052 is listed in this group.
Standard Replacement: 4 parts, from BECK/ARNLEY, WELLS, GPD and 1 other brand. A representative part number is BECK/ARNLEY 2011773.
This group includes BECK/ARNLEY 2011773, HOLSTEIN 2OPS0052 and WALKER PRODUCTS 2561069 and the remaining parts above.
Power Window Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular Fits: all 2021 Frontier engines | 901861 | 🇺🇸 US 🇲🇽 MX | Front LeftDoor Lock and Window Switch | View on Amazon |
| DORMAN Popular Fits: 3.8L V6 | 901878 | 🇺🇸 US | Front LeftExtended Cab Pickup | View on Amazon |
| DORMAN Fits: all 2021 Frontier engines | 901549 | 🇺🇸 US 🇲🇽 MX | Fits Rear Right | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Popular Fits: all 2021 Frontier engines | 1S12977 | 🇺🇸 US 🇲🇽 MX | Front Right | View on Amazon |
| ROSTRA Fits: all 2021 Frontier engines | 660171 | 🇺🇸 US 🇲🇽 MX | Rear | View on Amazon |
| ROSTRA Fits: all 2021 Frontier engines | 660213 | 🇺🇸 US 🇲🇽 MX | Front Right | View on Amazon |
| ROSTRA Fits: all 2021 Frontier engines | 660744 | 🇺🇸 US 🇲🇽 MX | Front Left | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | DWS814 | 🇺🇸 US 🇲🇽 MX | Rear | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: all 2021 Frontier engines | DWS322 | 🇺🇸 US 🇲🇽 MX | Front Right | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S12450 | 🇺🇸 US 🇲🇽 MX | Rear | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S14456 | 🇺🇸 US 🇲🇽 MX | Front Left | View on Amazon |
This table covers the switches that command each window motor. 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.
11 Power Window Switch parts for the 2021 Nissan Frontier come from 4 brands — DORMAN, WELLS, ROSTRA and 1 other brand. The "Popular" part is DORMAN 901861. 10 parts fit every engine; the other 1 is engine-specific.
The Economy section: 3 options from DORMAN. DORMAN 901861 is listed in this group.
Standard Replacement: 8 parts, from WELLS, ROSTRA and STANDARD MOTOR PRODUCTS. A representative part number is WELLS 1S12977.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: all 2021 Frontier engines | 1S17983 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17984 | 🇺🇸 US 🇲🇽 MX | with Fog Lights, without Automatic Headlights, with Audio | View on Amazon |
| WELLS Fits: all 2021 Frontier engines | 1S17985 | 🇺🇸 US 🇲🇽 MX | Includes Clock spring | View on Amazon |
This table covers the combination / turn-signal switches. 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 Turn Signal Switch parts for the 2021 Nissan Frontier come from WELLS. Every part fits all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6).
Listed part numbers: WELLS 1S17983, WELLS 1S17984 and WELLS 1S17985.
Buying Electrical Switch & Relay Parts for a 2021 Nissan Frontier
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: Power Window Switch and Brake Light Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Nissan Frontier?
Our catalog currently lists 53 electrical switch & relay parts for the 2021 Nissan Frontier across 12 subcategories and 15 brands, covering all 3 engine options (2.5L L4, 2.5L L4 DIESEL Turbocharged and 3.8L V6). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 Nissan Frontier engines?
Some do. 37 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 2021 Nissan Frontier?
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 2021 Nissan Frontier 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 2021 Nissan Frontier?
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 2021 Nissan Frontier
Electrical Switch & Relay Parts for Other Nissan Frontier Years
Switch vehicle or jump to a subcategory
Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.