The 2020 BMW M4 has 30 electrical switch & relay parts with verified fitment on this page — 12 part types and 10 brands, covering the 3.0L L6 Turbocharged engine. Each part includes a manufacturer part number and application notes.
On the 2020 BMW M4, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 14 parts of the 30 listed are Brake Light Switch (5 parts), Oil Pressure Sender / Switch (5 parts) and Power Window Switch (4 parts). The other 9 part types cover the remaining 16 parts.
The 2020 BMW M4 came with a single engine, the 3.0L L6 Turbocharged, and every part is verified against it.
10 brands supply electrical switch & relay parts for the 2020 BMW M4, led by WELLS (12 parts), VEMO (5 parts) and STANDARD MOTOR PRODUCTS (3 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2020 BMW M4. 2 parts have it, including STANDARD MOTOR PRODUCTS SLS541 (Brake Light Switch) and WELLS 1S11835 (Oil Pressure Sender / Switch). Each part number opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 20997 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Switch | View on Amazon |
| REIN | ACS0243P | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| UAC | SW11170C | 🇺🇸 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.
3 A/C Refrigerant Pressure Switch parts are listed for the 2020 BMW M4, from FOUR SEASONS, REIN and UAC.
Part numbers include FOUR SEASONS 20997, REIN ACS0243P and UAC SW11170C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 920458 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VEMO | V20730151 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | SLS541 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| BECK/ARNLEY | 2012711 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS | 1S12667 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
5 Brake Light Switch parts are listed for the 2020 BMW M4, from DORMAN, VEMO, STANDARD MOTOR PRODUCTS and 2 other brands. STANDARD MOTOR PRODUCTS SLS541 carries the "Popular" badge.
In the Economy grade, DORMAN and VEMO supply 2 parts: the catalog's value-priced group. A representative part number is DORMAN 920458.
The Standard Replacement section lists 3 options from STANDARD MOTOR PRODUCTS, BECK/ARNLEY and WELLS — built to original-equipment specification. STANDARD MOTOR PRODUCTS SLS541 is listed in this group.
Part numbers include STANDARD MOTOR PRODUCTS SLS541, DORMAN 920458 and VEMO V20730151, among others listed above.
Clutch Pedal Position / Starter Safety Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ÜRO PARTS | 35426876898 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Located on clutch master cylinder | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 2012717 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Clutch Pedal Position / Starter Safety 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.
2 Clutch Pedal Position / Starter Safety Switch parts for the 2020 BMW M4 come from 2 brands — ÜRO PARTS and BECK/ARNLEY.
The Economy section: 1 option from ÜRO PARTS. ÜRO PARTS 35426876898 is listed in this group.
Standard Replacement: 1 part, from BECK/ARNLEY. A representative part number is BECK/ARNLEY 2012717.
Part numbers include ÜRO PARTS 35426876898 and BECK/ARNLEY 2012717.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17943 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Driver Assist, without Heated Steering Wheel, without High Beam Assist, without Lane Departure Warning, with Rain Sensitive Wipers | View on Amazon |
| WELLS | 1S17941 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Driver Assist, with Heated Steering Wheel, without High Beam Assist, with Lane Departure Warning, with Rain Sensitive Wipers | 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.
2 Dimmer Switch parts for the 2020 BMW M4 come from WELLS.
Listed part numbers: WELLS 1S17943 and WELLS 1S17941.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S18204 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
This group shows a single part: WELLS 1S18204.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20710021 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Convertible | 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.
This group shows a single part: VEMO V20710021.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20800005 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS | 1S16683 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Push Button Switch | 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.
2 Ignition Starter Switch parts for the 2020 BMW M4 come from 2 brands — VEMO and WELLS.
This group includes VEMO V20800005 and WELLS 1S16683.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 987015 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| HOLSTEIN | 2OPS0039 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Popular | 1S11835 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| BECK/ARNLEY | 2012737 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Light | View on Amazon |
| STANDARD MOTOR PRODUCTS | PS529 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
5 Oil Pressure Sender / Switch parts are listed for the 2020 BMW M4, from DORMAN, HOLSTEIN, WELLS and 2 other brands. WELLS 1S11835 carries the "Popular" badge.
Economy: 2 parts, from DORMAN and HOLSTEIN. A representative part number is DORMAN 987015.
The Standard Replacement section: 3 options from WELLS, BECK/ARNLEY and STANDARD MOTOR PRODUCTS. WELLS 1S11835 is listed in this group.
Part numbers include WELLS 1S11835, DORMAN 987015 and HOLSTEIN 2OPS0039, among others listed above.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | DWS2007 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Black | View on Amazon |
| VEMO | V20730085 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Right | View on Amazon |
| WELLS | 1S16299 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| WELLS | 1S17183 | 🇺🇸 US 🇨🇦 CA 🇲🇽 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.
4 Power Window Switch parts are listed for the 2020 BMW M4, from WELLS, STANDARD MOTOR PRODUCTS and VEMO.
Part numbers include STANDARD MOTOR PRODUCTS DWS2007, VEMO V20730085 and WELLS 1S16299, among others listed above.
Trunk Lid / Tailgate Release Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V20730310 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Trunk Lid / Tailgate Release 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: VEMO V20730310.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17943 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Driver Assist, without Heated Steering Wheel, without High Beam Assist, without Lane Departure Warning, with Rain Sensitive Wipers | View on Amazon |
| WELLS | 1S17941 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Driver Assist, with Heated Steering Wheel, without High Beam Assist, with Lane Departure Warning, with Rain Sensitive Wipers | 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.
WELLS supplies both parts for the 2020 BMW M4.
Part numbers include WELLS 1S17943 and WELLS 1S17941.
Wiper / Washer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17943 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Driver Assist, without Heated Steering Wheel, without High Beam Assist, without Lane Departure Warning, with Rain Sensitive Wipers | View on Amazon |
| WELLS | 1S17941 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Driver Assist, with Heated Steering Wheel, without High Beam Assist, with Lane Departure Warning, with Rain Sensitive Wipers | View on Amazon |
This table covers the Wiper / Washer 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.
2 Wiper / Washer Switch parts for the 2020 BMW M4 come from WELLS.
This group includes WELLS 1S17943 and WELLS 1S17941.
Buying Electrical Switch & Relay Parts for a 2020 BMW M4
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 3.0L L6 Turbocharged engine — every part on this page is matched to it.
- 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 Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2020 BMW M4?
Our catalog currently lists 30 electrical switch & relay parts for the 2020 BMW M4 across 12 subcategories and 10 brands, covering the 3.0L L6 Turbocharged engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2020 BMW M4?
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 2020 BMW M4 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 2020 BMW M4?
Every part on this page is matched to the 3.0L L6 Turbocharged engine. 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 2020 BMW M4
Electrical Switch & Relay Parts for Other BMW M4 Years
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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.