This page lists 36 electrical switch & relay parts for the 2021 Lexus ES250, across 22 part types, covering the 2.5L L4 engine. Every part shows its brand, manufacturer part number and fitment notes.
The switch and relay system on the 2021 Lexus ES250 covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are Blower Motor Relay (3 parts), Daytime Running Light Relay (3 parts) and Defroster Relay (3 parts). The other 19 part types cover the remaining 27 parts.
The 2021 Lexus ES250 came with a single engine, the 2.5L L4, and every part is verified against it.
6 brands supply electrical switch & relay parts for the 2021 Lexus ES250, led by DENSO (27 parts), WELLS (3 parts) and UAC (2 parts), plus 3 more brands.
Each part number listed for the 2021 Lexus ES250 opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GPD | 1713402 | 🇺🇸 US 🇨🇦 CA | Transducer | View on Amazon |
| UAC | SW11605C | 🇺🇸 US 🇨🇦 CA | 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.
2 A/C Refrigerant Pressure Switch parts are listed for the 2021 Lexus ES250, from GPD and UAC.
This group includes GPD 1713402 and UAC SW11605C.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC | RE8402C | 🇺🇸 US 🇨🇦 CA | 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.
One part is listed for the 2021 Lexus ES250 — UAC RE8402C.
Auxiliary Heater Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670005 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Auxiliary Heater 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: DENSO 5670005.
Blower Motor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670005 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Blower Motor 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.
DENSO supplies the 3 Blower Motor Relay parts for the 2021 Lexus ES250.
This group includes DENSO 5670005, DENSO 5670004 and DENSO 5670003.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S16745 | 🇺🇸 US 🇨🇦 CA | From 09/2020 | 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.
One part is listed for the 2021 Lexus ES250 — WELLS 1S16745.
Daytime Running Light Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670005 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Daytime Running Light 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.
DENSO supplies the 3 Daytime Running Light Relay parts for the 2021 Lexus ES250.
Listed part numbers: DENSO 5670005, DENSO 5670004 and DENSO 5670003.
Defroster Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670005 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Defroster 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.
DENSO supplies the 3 Defroster Relay parts for the 2021 Lexus ES250.
Listed part numbers: DENSO 5670005, DENSO 5670004 and DENSO 5670003.
Dimmer Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670005 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Dimmer 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.
One part is listed for the 2021 Lexus ES250 — DENSO 5670005.
Engine Control Module Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Engine Control Module 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 Engine Control Module Relay parts for the 2021 Lexus ES250 come from DENSO.
Listed part numbers: DENSO 5670004 and DENSO 5670003.
Fog / Driving Lamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | 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.
DENSO supplies both parts for the 2021 Lexus ES250.
Listed part numbers: DENSO 5670004 and DENSO 5670003.
Fuel Pump / Circuit Opening Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Fuel Pump / Circuit Opening 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.
One part is listed for the 2021 Lexus ES250 — DENSO 5670004.
Headlamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Headlamp 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.
One part is listed for the 2021 Lexus ES250 — DENSO 5670003.
Horn Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | 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: DENSO 5670004.
Neutral Safety Switch / Range Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V70730066 | 🇺🇸 US 🇨🇦 CA | Fits PremiumFrom 09/2020 | View on Amazon |
This table covers the Neutral Safety Switch / Range sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
One part is listed for the 2021 Lexus ES250 — VEMO V70730066.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | PS765 | 🇺🇸 US 🇨🇦 CA | with LightExcept Japan Built Vehicle | View on Amazon |
| WELLS | 1S16610 | 🇺🇸 US 🇨🇦 CA | North American Built | View on Amazon |
| WELLS | 1S16611 | 🇺🇸 US 🇨🇦 CA | Parts Manufactured in Japan | 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.
3 Oil Pressure Sender / Switch parts are listed for the 2021 Lexus ES250, from WELLS and STANDARD MOTOR PRODUCTS.
Part numbers include STANDARD MOTOR PRODUCTS PS765, WELLS 1S16610 and WELLS 1S16611.
Power Steering Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Power Steering 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.
One part is listed for the 2021 Lexus ES250 — DENSO 5670003.
Power Window Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Power Window 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: DENSO 5670004.
Radiator Fan Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | Motor Relay | View on Amazon |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004Motor 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.
2 Radiator Fan Relay parts for the 2021 Lexus ES250 come from DENSO.
Part numbers include DENSO 5670004 and DENSO 5670003.
Seat Heater Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Seat Heater 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.
One part is listed for the 2021 Lexus ES250 — DENSO 5670004.
Starter Motor Control Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
| STANDARD MOTOR PRODUCTS | RY1615 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Square | 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.
3 Starter Motor Control Relay parts for the 2021 Lexus ES250 come from 2 brands — DENSO and STANDARD MOTOR PRODUCTS.
Listed part numbers: DENSO 5670004, DENSO 5670003 and STANDARD MOTOR PRODUCTS RY1615.
Tail Lamp Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670004 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the Tail 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.
One part is listed for the 2021 Lexus ES250 — DENSO 5670004.
Turn Signal Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DENSO | 5670003 | 🇺🇸 US 🇨🇦 CA | 39795-SJK-004 | View on Amazon |
This table covers the relays that control the Turn Signal 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: DENSO 5670003.
Buying Electrical Switch & Relay Parts for a 2021 Lexus ES250
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 2.5L L4 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: Blower Motor Relay and Daytime Running Light Relay .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Lexus ES250?
Our catalog currently lists 36 electrical switch & relay parts for the 2021 Lexus ES250 across 22 subcategories and 6 brands, covering the 2.5L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 Lexus ES250?
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 Lexus ES250 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 Lexus ES250?
Every part on this page is matched to the 2.5L L4 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 2021 Lexus ES250
Electrical Switch & Relay Parts for Other Lexus ES250 Years
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