How do relays work in the electrical system, and How to test and diagnose relay-related issues on Lexus ES300?

Various electrical accessories within the vehicle, such as the fuel injection system, horns, starter, air conditioning/heating system, and fog lights, utilize relays to transmit electrical signals to the respective components. Relays function by utilizing a low-current control circuit to open and close a high-current power circuit. A defective relay can result in improper component operation. These relays are typically situated in engine compartment fuse/relay boxes. In case of suspected relay malfunction, they can be removed and tested. Faulty relays need to be replaced as a complete unit. To test relays, usually marked for identification, it's important to recognize the control circuit terminals (connected to the relay coil) and the power circuit terminals (connected when the control circuit coil is energized). Fused jumper wires are used to connect the control circuit terminals to the positive battery terminal and the ground. A functional relay should click with these connections. Continuity checks are then performed between the power circuit terminals, following the relay markings. If any of the tests fail, the relay should be replaced.

Genuine Lexus ES300 Relay

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51 Relays found

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Lexus ES300 Relay
Part Number: 90987-02025
$71.86 MSRP: $95.63
You Save: $23.77 (25%)
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Product Specifications
- Other Name: Relay, Cooling Fan
- Replaced by: 90080-87024
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2002-2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-03003
$36.86 MSRP: $49.05
You Save: $12.19 (25%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assy, Fuel Pump; Fuel Pump Relay
- Manufacturer Note: (J)
- Replaces: 90084-98011
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-02027
$25.08 MSRP: $32.09
You Save: $7.01 (22%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay, Front Wiper Deicer
- Replaced by: 90080-87026
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02028
$85.47 MSRP: $115.59
You Save: $30.12 (27%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Relay, Magnet-Clutch
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2002-2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02012
$99.11 MSRP: $131.89
You Save: $32.78 (25%)
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Product Specifications
- Other Name: Relay, Magnet-Clutch
- Replaced by: 90084-98031
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2003 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK, MCV30L-BEAGKA
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Lexus ES300 Relay, Skid Control
Part Number: 88263-21010
$73.66 MSRP: $99.62
You Save: $25.96 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2003 Lexus ES300 | 6 Cyl 3.3L | 3MZFE; MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02004
$28.85 MSRP: $36.91
You Save: $8.06 (22%)
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Product Specifications
- Other Name: Relay, Computer (For EFI)
- Replaced by: 90987-02004-83
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-1994 Lexus ES300 | 6 Cyl 3.0L | 3VZFE; VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-04004
$63.30 MSRP: $80.99
You Save: $17.69 (22%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Relay, Cooling Fan, NO.2
- Replaced by: 90084-98032
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK, MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay Assy, Starter
Part Number: 28300-10020
$84.86 MSRP: $114.75
You Save: $29.89 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay, Starter Relay
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1993-2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK, MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02016
$71.86 MSRP: $95.63
You Save: $23.77 (25%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay, Headlamp
- Replaced by: 90080-87024
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2002-2003 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV30L-BEAGKA
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Lexus ES300 Relay, Skid Control
Part Number: 88263-24030
$74.89 MSRP: $101.28
You Save: $26.39 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: ABS Relay, Motor Relay, Relay
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-02006
$40.51 MSRP: $53.91
You Save: $13.40 (25%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay, Headlamp
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE, 3VZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK, VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay, Light Control
Part Number: 85916-30060
$141.39 MSRP: $192.77
You Save: $51.38 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay, Headlamp; Relay
- Manufacturer Note: W(DISCHARGE HEADLAMP)
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1999-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-04002
$29.37 MSRP: $37.58
You Save: $8.21 (22%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Relay Assy (For Heater Blower Motor)
- Replaced by: 90987-04002-83
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE, 3VZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK, VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-02009
$50.36 MSRP: $67.02
You Save: $16.66 (25%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Relay Assy, Cooler
- Replaces: 90987-02010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-1996 Lexus ES300 | 6 Cyl 3.0L | 1MZFE, 3VZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay Assy, Horn
Part Number: 86530-20070
$19.08 MSRP: $24.60
You Save: $5.52 (23%)
Ships in 1 Business Day
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Product Specifications
- Other Name: Horn Relay, Relay
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1992-1996 Lexus ES300 | 6 Cyl 3.0L | 1MZFE, 3VZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-04010
$71.74 MSRP: $95.46
You Save: $23.72 (25%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Relay, Defogger
- Replaced by: 90080-87025
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 2003 Lexus ES300 | 6 Cyl 3.0L, 6 Cyl 3.3L | 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay, Skid Control
Part Number: 88263-24020
$73.30 MSRP: $99.12
You Save: $25.82 (27%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: ABS Relay, Motor Relay, Relay
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1998-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay, Radiator Fan
Part Number: 85925-17010
$65.55 MSRP: $88.64
You Save: $23.09 (27%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Fan Relay, Relay
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
- 1994-1995 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK
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Lexus ES300 Turn Signal Flasher Assembly
Part Number: 81980-12070
$60.05 MSRP: $76.83
You Save: $16.78 (22%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Flasher Assy, Turn Signal
- Replaced by: 81980-32010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1993-1998 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK

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1-20 of 51 Results

Lexus ES300 Relay

The Lexus ES300 Relay serves as an electrically controlled switch that allows the climate system to receive full power only when the control module sends a low-current signal, avoiding wasted energy and protecting expensive parts. Inside every ES300, this little device carries input terminals that sense the command and contact terminals that snap open or closed on circuits for the fan, blower motor, or compressor within milliseconds without the driver noticing anything, keeping cabin temperature steady. Traditional electromechanical Relay design prevailed during the early Lexus years, with an iron core electromagnet applied to pull contacts together, while the later ES300 editions started to see the introduction of solid-state versions, relying on semiconductors and reducing the number of moving parts while increasing service life. Another style found in select Lexus models is the latching Relay, which maintains its position after one pulse so a brief loss of power will not freeze the A/C controls, a handy safeguard during start-up voltage dips. A big difference between each Relay form is that motion; the electromechanical form clicks mechanically once every cycle, the solid-state version switches silently through silicon, and the latching version knows the state it was in last time until it gets an opposite pulse. Replacing a tired Relay before hunting for big-ticket parts saves time and cash because a failed switch instantly stops the ES300 fan or blower, triggers dash warnings, and can ripple through multiple circuits, preserving the year-round comfort expected inside a Lexus ES300.

Should you need to purchase new auto parts for your vehicle, we strongly suggest you consider the genuine Lexus ES300 Relay available on LexusPartsNow.com. Our OEM Lexus ES300 Relay come with the reassurance of the manufacturer's warranty, a hassle-free return policy, and speedy delivery service, all at affordable prices online. Feel free to shop with confidence!

Lexus ES300 Relay Parts Questions & Experts Answers

Relay Assy, Starter
28300-10020
Q: How do relays work in the electrical system, and How to test and diagnose relay-related issues on Lexus ES300?
A:
Various electrical accessories within the vehicle, such as the fuel injection system, Horns, starter, air conditioning/heating system, and fog lights, utilize relays to transmit electrical signals to the respective components. Relays function by utilizing a low-current control circuit to open and close a high-current power circuit. A defective relay can result in improper component operation. These relays are typically situated in engine compartment fuse/relay boxes. In case of suspected relay malfunction, they can be removed and tested. Faulty relays need to be replaced as a complete unit. To test relays, usually marked for identification, it's important to recognize the control circuit terminals (connected to the relay coil) and the power circuit terminals (connected when the control circuit coil is energized). Fused jumper wires are used to connect the control circuit terminals to the positive battery terminal and the ground. A functional relay should click with these connections. Continuity checks are then performed between the power circuit terminals, following the relay markings. If any of the tests fail, the relay should be replaced.

Related Lexus ES300 Parts

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