How do relays work in the Lexus ES300's electrical system, and how can I test and diagnose relay-related issues?

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
$67.60 MSRP: $89.95
You Save: $22.35 (25%)
Ships in 1-3 Business Days
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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; 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02028
$80.31 MSRP: $108.61
You Save: $28.30 (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; 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02004
$9.26 MSRP: $11.84
You Save: $2.58 (22%)
Ships in 1-3 Business Days
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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; 3VZFE; VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-02027
$23.53 MSRP: $30.11
You Save: $6.58 (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; 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-03003
$49.70 MSRP: $66.14
You Save: $16.44 (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; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay
Part Number: 90987-04002
$18.11 MSRP: $23.18
You Save: $5.07 (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; 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: 90987-02006
$17.39 MSRP: $22.42
You Save: $5.03 (23%)
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; 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: 90987-04004
$59.53 MSRP: $76.17
You Save: $16.64 (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; 1MZFE, 3MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK, MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay, Skid Control
Part Number: 88263-24030
$62.45 MSRP: $83.09
You Save: $20.64 (25%)
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; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay, Skid Control
Part Number: 88263-21010
$64.64 MSRP: $87.40
You Save: $22.76 (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; 3MZFE; MCV31L-BEAGKA
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Lexus ES300 Relay
Part Number: 90987-02016
$67.60 MSRP: $89.95
You Save: $22.35 (25%)
Ships in 1-3 Business Days
ADD TO CART
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; 1MZFE; MCV30L-BEAGKA
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Lexus ES300 Relay Assy, Starter
Part Number: 28300-10020
$72.64 MSRP: $98.24
You Save: $25.60 (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; 1MZFE, 3MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, MCV20L-BTPGKA, MCV20L-BTPGKK, MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Flasher Assy, Turn Signal
Part Number: 81980-50030
$63.32 MSRP: $81.02
You Save: $17.70 (22%)
Ships in 1-3 Business Days
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Product Specifications
- Manufacturer Note: ###
- Replaced by: 81980-02030
- 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; 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Flasher Assy, Turn Signal
Part Number: 81980-12110
$57.28 MSRP: $73.28
You Save: $16.00 (22%)
Ships in 1-3 Business Days
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Product Specifications
- Replaced by: 81980-32010
- Warranty: This genuine part is guaranteed by Lexus's factory warranty.
Fits the following Vehicles:
- 1997-2001 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay, Radiator Fan
Part Number: 85925-17010
$62.45 MSRP: $83.09
You Save: $20.64 (25%)
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; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
- 1994-1995 Lexus ES300 | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCV10L-BTPGKA, MCV10L-BTPGKK
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Lexus ES300 Relay, Skid Control
Part Number: 88263-14110
$103.66 MSRP: $140.18
You Save: $36.52 (27%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Main Relay, Relay
- Manufacturer Note: MOTOR 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; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK
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Lexus ES300 Relay, Skid Control
Part Number: 88263-32070
$108.29 MSRP: $144.09
You Save: $35.80 (25%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Abs Solenoid
- Replaced by: 88263-08010
- 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; 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
View related parts
Lexus ES300 Relay
Part Number: 90987-04010
$67.60 MSRP: $89.95
You Save: $22.35 (25%)
Ships in 1-2 Business Days
ADD TO CART
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; 1MZFE, 3MZFE; MCV30L-BEAGKA, MCV31L-BEAGKA
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Lexus ES300 Relay Assy, Horn
Part Number: 86530-20070
$17.85 MSRP: $23.01
You Save: $5.16 (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; 1MZFE, 3VZFE; MCV10L-BTPGKA, MCV10L-BTPGKK, VCV10L-BTMGKA, VCV10L-BTMGKK, VCV10L-BTPGKA, VCV10L-BTPGKK
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Lexus ES300 Relay, Skid Control
Part Number: 88263-24020
$59.51 MSRP: $79.19
You Save: $19.68 (25%)
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; 1MZFE; MCV20L-BTPGKA, MCV20L-BTPGKK

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Lexus ES300 Relay

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 Lexus ES300's electrical system, and how can I test and diagnose relay-related issues?
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.

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