How Do Relays Function in Various Electrical Accessories on 2007 through 2015 Toyota Avalon?

Several electrical accessories in the vehicle, such as the fuel injection system, and horns starter use relays to transmit the electrical signal. Next, relays use a low-current circuit, the control circuit, to open and close a high-current circuit, the power circuit. Also, most relays are mounted in the engine compartment and interior fuse/relay boxes.

What is the purpose of relays in electrical system on 2002 through 2006 Toyota Avalon?

Several electrical accessories in the vehicle, such as the fuel injection system, horns, starter, and fog lamps use relays to transmit the electrical signal to the component. Relays use a low-current circuit to open and close a high-current circuit. If the relay is defective, that component will not operate properly. Most relays are mounted in the engine compartment fuse/relay box, with some specialized relays located in the underhood box at the right fender. On some models, the ABS relays are located in a separate underhood relay box at the left side of the radiator. If a faulty relay is suspected, it can be removed and tested. Defective relays must be replaced as a unit. Identification of the circuit the relay controls is often marked on the top of the relay, but the decal or imprint inside the cover of the relay box should also indicate which circuits they control. To test a relay, connect an ohmmeter across the two terminals of the power circuit. Continuity should not be indicated. Now connect a fused jumper wire between one of the two control circuit terminals and the positive battery terminal. Connect another jumper wire between the other control circuit terminal and ground. When the connections are made, the relay should click and continuity should be indicated on the meter. If the relay fails the test, replace it.

How do relays work in electrical system, and how can I test and diagnose relay-related issues on 1997 through 2001 Toyota Avalon?

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 Toyota Avalon Relay

Wire Relay

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Make

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

63 Relays found

View related parts
Toyota Avalon Fog Lights - Relay - Service
Part Number: 90080-87026
$21.54 MSRP: $30.11
You Save: $8.57 (29%)
ADD TO CART
Product Specifications
- Other Name: Relay, Fog Lamp; ECM Relay, Fan Relay, Horn Relay, Relay
- Replaces: 90987-02027, 90080-87010, 85915-12020, 90987-T2001
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2005-2022 Toyota Avalon | Limited, Touring, XL, XLE, XLE Premium, XLE Touring Or Touring, XLS, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L | 2ARFXE, 2GRFE, 2GRFKS, A25AFKS, A25AFXS; 2ARFXE, 2GRFE, 2GRFKS, A25AFKS, A25AFXS; AVX40L-AEXGBA, AVX40L-AEXPBA, AXXA55L-AEZGBA, AXXA55L-AEZPBA, AXXH50L-AEXGBA, AXXH50L-AEXPBA, AXXH50L-AEXQBA, AXXH51L-AEXGBA, AXXH51L-AEXPBA, AXXH51L-AEXQBA, GSX30L-AEAGKA, GSX30L-AEANKA, GSX30L-AEAPKA, GSX30L-AETGKA, GSX30L-AETNKA, GSX30L-AETPKA, GSX40L-AETGKA, GSX40L-AETPKA, GSX40L-AETQKA, GSX50L-AEZGBA, GSX50L-AEZPBA, GSX50L-AEZQBA, GSX50L-AEZSBA
View related parts
Toyota Avalon Relay Assembly
Part Number: 90987-02006
$16.04 MSRP: $22.42
You Save: $6.38 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Headlamp
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1995-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay
Part Number: 90987-04002
$16.58 MSRP: $23.18
You Save: $6.60 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay Assy (For Heater Blower Motor)
- Position: Front
- Replaced by: 90987-04002-83
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1995-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay Assy, Cooler
Part Number: 90987-02028
$77.04 MSRP: $108.61
You Save: $31.57 (30%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Relay, Magnet-Clutch; Relay
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2005-2012 Toyota Avalon | Limited, XL, XLS | 6 Cyl 3.5L | 2GRFE; 2GRFE; GSX30L-AEAGKA, GSX30L-AEANKA, GSX30L-AEAPKA, GSX30L-AETGKA, GSX30L-AETNKA, GSX30L-AETPKA
View related parts
Toyota Avalon Relay
Part Number: 90987-02027
$21.54 MSRP: $30.11
You Save: $8.57 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Cooling Fan
- Replaced by: 90080-87026
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2022 Toyota Avalon | Limited, Touring, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L | 2ARFXE, 2GRFKS, A25AFKS, A25AFXS; 2ARFXE, 2GRFKS, A25AFKS, A25AFXS; AVX40L-AEXGBA, AVX40L-AEXPBA, AXXA55L-AEZGBA, AXXA55L-AEZPBA, AXXH50L-AEXGBA, AXXH50L-AEXPBA, AXXH50L-AEXQBA, AXXH51L-AEXGBA, AXXH51L-AEXPBA, AXXH51L-AEXQBA, GSX50L-AEZGBA, GSX50L-AEZPBA, GSX50L-AEZQBA, GSX50L-AEZSBA
View related parts
Toyota Avalon Relay, Acc
Part Number: 90084-98032
$54.49 MSRP: $76.17
You Save: $21.68 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Cooling Fan, NO.2; Fan Relay, Fuel Pump Relay, Relay, Relay Box Relay
- Comment: (AUTO DRIVE)
- Replaces: 90084-98026, 90080-87014, 90987-04004
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2022 Toyota Avalon | Limited, XLE, XLE Premium, XLE Touring Or Touring, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L | 2ARFXE, 2GRFE, A25AFXS; 2ARFXE, 2GRFE, 2GRFE; AVX40L-AEXGBA, A25AFXS; AVX40L-AEXGBA, AVX40L-AEXPBA, AXXH50L-AEXGBA, AXXH51L-AEXGBA, AXXH51L-AEXPBA, AXXH51L-AEXQBA, GSX40L-AETGKA, GSX40L-AETPKA, GSX40L-AETQKA
- 1998-2011 Toyota Avalon | Limited, XL, XLS | 6 Cyl 3.0L, 6 Cyl 3.5L | 1MZFE, 2GRFE; 1MZFE, 1MZFE; MCX10L-AEPGKA, 2GRFE; GSX30L-AEAPKA, GSX30L-AETPKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay
Part Number: 90987-02025
$63.81 MSRP: $89.95
You Save: $26.14 (30%)
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 Toyota's factory warranty.
Fits the following Vehicles:
- 2002-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay, Acc
Part Number: 90080-87024
$63.81 MSRP: $89.95
You Save: $26.14 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Headlamp
- Comment: (FOR EFI)
- Replaces: 90987-02025, 90987-T2002, 90987-02016
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2022 Toyota Avalon | Limited, Touring, XL, XLE, XLE Premium, XLE Touring Or Touring, XLS, XSE | 4 Cyl 2.5L, 6 Cyl 3.0L, 6 Cyl 3.5L | 1MZFE, 2ARFXE, 2GRFE, 2GRFKS, A25AFKS, A25AFXS; 1MZFE; MCX20L-AEPGKA, 2ARFXE, 2GRFE, 2GRFKS, A25AFKS, A25AFXS; AVX40L-AEXGBA, AVX40L-AEXPBA, AXXA55L-AEZGBA, AXXA55L-AEZPBA, AXXH50L-AEXGBA, AXXH50L-AEXPBA, AXXH50L-AEXQBA, AXXH51L-AEXGBA, AXXH51L-AEXPBA, AXXH51L-AEXQBA, GSX30L-AEAGKA, GSX30L-AEANKA, GSX30L-AEAPKA, GSX30L-AETGKA, GSX30L-AETNKA, GSX30L-AETPKA, GSX40L-AETGKA, GSX40L-AETPKA, GSX40L-AETQKA, GSX50L-AEZGBA, GSX50L-AEZPBA, GSX50L-AEZQBA, GSX50L-AEZSBA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay Assembly, Starter
Part Number: 28300-10020
$69.69 MSRP: $98.24
You Save: $28.55 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay Assy, Starter; Relay, Relay Box Relay, Starter Relay
- Replaces: 28341-11010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1995-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay, Acc
Part Number: 90987-02012
$87.79 MSRP: $123.75
You Save: $35.96 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Computer (For EFI)
- Replaced by: 90084-98031
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2000-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay
Part Number: 90987-02009
$40.86 MSRP: $57.12
You Save: $16.26 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Computer (For EFI)
- Replaces: 90084-98009, 90987-02010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1995-1999 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK
View related parts
Toyota Avalon Relay Assembly
Part Number: 90080-87025
$63.81 MSRP: $89.95
You Save: $26.14 (30%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Relay, Defogger
- Comment: (FOR HEATER BLOWER MOTOR)
- Replaces: 90987-04006, 90987-04010, 90080-87031
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2022 Toyota Avalon | Limited, Touring, XLE, XSE | 4 Cyl 2.5L, 6 Cyl 3.5L | 2GRFKS, A25AFKS, A25AFXS; 2GRFKS, A25AFKS, A25AFXS; AXXA55L-AEZGBA, AXXA55L-AEZPBA, AXXH50L-AEXGBA, AXXH50L-AEXPBA, AXXH50L-AEXQBA, AXXH51L-AEXGBA, AXXH51L-AEXPBA, AXXH51L-AEXQBA, GSX50L-AEZGBA, GSX50L-AEZPBA, GSX50L-AEZQBA, GSX50L-AEZSBA
- 2005-2011 Toyota Avalon | Limited, XL, XLS | 6 Cyl 3.5L | 2GRFE; 2GRFE; GSX30L-AEAGKA, GSX30L-AEANKA, GSX30L-AEAPKA, GSX30L-AETGKA, GSX30L-AETNKA, GSX30L-AETPKA
View related parts
Toyota Avalon Relay, Acc
Part Number: 90084-98031
$87.79 MSRP: $123.75
You Save: $35.96 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Computer (For EFI)
- Replaces: 90080-87008, 90080-87019, 90987-02012, 90084-98025
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1998-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, 1MZFE; MCX20L-AEPGKA, MCX10L-AEPNKA, MCX10L-AESGKA, MCX10L-AESNKA, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay
Part Number: 90987-04004
$54.49 MSRP: $76.17
You Save: $21.68 (29%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Relay, Cooling Fan, NO.2
- Replaced by: 90084-98032
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2013-2018 Toyota Avalon | Limited, XLE, XLE Premium, XLE Touring Or Touring | 4 Cyl 2.5L, 6 Cyl 3.5L | 2ARFXE, 2GRFE; 2ARFXE, 2GRFE; AVX40L-AEXGBA, AVX40L-AEXPBA, GSX40L-AETGKA, GSX40L-AETPKA, GSX40L-AETQKA
- 1998-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Flasher Assy, Turn Signal
Part Number: 81980-12070
$52.43 MSRP: $73.28
You Save: $20.85 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Replaced by: 81980-32010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1995-1998 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK
View related parts
Toyota Avalon Relay
Part Number: 90987-04003
$17.89 MSRP: $24.99
You Save: $7.10 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay Assy, Cooler; Fan Relay
- Comment: (FOR RADIATOR FAN)
- Replaces: 90084-98010
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1995-1999 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK
View related parts
Toyota Avalon Relay, Skid Control
Part Number: 88263-24030
$59.45 MSRP: $83.09
You Save: $23.64 (29%)
Ships in 1 Business Day
ADD TO CART
Product Specifications
- Other Name: Relay, Skid Control NO.2; ABS Relay, Control Relay, Relay
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1996-2004 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK, MCX20L-AEPGKA, MCX20L-AEPGKK, MCX20L-AEPNKA, MCX20L-AEPNKK, MCX20L-AESGKA, MCX20L-AESNKA
View related parts
Toyota Avalon Relay
Part Number: 90987-02031
$19.44 MSRP: $27.18
You Save: $7.74 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay, Ignition, NO.1
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2019-2022 Toyota Avalon | Limited, XLE, XSE | 4 Cyl 2.5L | A25AFXS; A25AFXS; AXXH50L-AEXGBA, AXXH50L-AEXPBA, AXXH50L-AEXQBA, AXXH51L-AEXGBA, AXXH51L-AEXPBA, AXXH51L-AEXQBA
View related parts
Toyota Avalon Relay, Radiator Fan
Part Number: 85925-17010
$59.45 MSRP: $83.09
You Save: $23.64 (29%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Fan Relay, Main Relay, Relay
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 1997-1999 Toyota Avalon | XL, XLS | 6 Cyl 3.0L | 1MZFE; 1MZFE; MCX10L-AEPGKA, MCX10L-AEPGKK, MCX10L-AEPNKA, MCX10L-AEPNKK, MCX10L-AESGKA, MCX10L-AESGKK, MCX10L-AESNKA, MCX10L-AESNKK
View related parts
Toyota Avalon Relay Assembly, Starter
Part Number: 28300-0A010
$70.00 MSRP: $98.67
You Save: $28.67 (30%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Relay Assy, Starter
- Replaced by: 28300-0A011
- Warranty: This genuine part is guaranteed by Toyota's factory warranty.
Fits the following Vehicles:
- 2005-2016 Toyota Avalon | Limited, XL, XLE Premium, XLE Touring Or Touring, XLS | 6 Cyl 3.5L | 2GRFE; 2GRFE; GSX30L-AEAGKA, GSX30L-AEANKA, GSX30L-AEAPKA, GSX30L-AETGKA, GSX30L-AETNKA, GSX30L-AETPKA, GSX40L-AETGKA, GSX40L-AETPKA, GSX40L-AETQKA

| Page 1 of 4 |Next >

1-20 of 63 Results

Toyota Avalon Relay

If you are in demand for superior quality and affordable OEM Toyota Avalon Relay, then shop with us! We own a wide range of the reduced-priced genuine Toyota Avalon Relay. You can purchase in confidence as all parts come with a manufacturer's warranty. Any issues with our products? No need to worry as we have a hassle-free return policy to guide you every step of the way.

Toyota Avalon Relay Parts Questions & Experts Answers

Relay, Skid Control
88263-21010
Q: How Do Relays Function in Various Electrical Accessories on 2007 through 2015 Toyota Avalon?
A: Several electrical accessories in the vehicle, such as the fuel injection system, and Horns starter use relays to transmit the electrical signal. Next, relays use a low-current circuit, the control circuit, to open and close a high-current circuit, the power circuit. Also, most relays are mounted in the engine compartment and interior fuse/relay boxes.
Relay Assembly, Starter
28300-0A010
Q: What is the purpose of relays in electrical system on 2002 through 2006 Toyota Avalon?
A: Several electrical accessories in the vehicle, such as the fuel injection system, Horns, starter, and fog lamps use relays to transmit the electrical signal to the component. Relays use a low-current circuit to open and close a high-current circuit. If the relay is defective, that component will not operate properly. Most relays are mounted in the engine compartment fuse/relay box, with some specialized relays located in the underhood box at the right fender. On some models, the ABS relays are located in a separate underhood relay box at the left side of the radiator. If a faulty relay is suspected, it can be removed and tested. Defective relays must be replaced as a unit. Identification of the circuit the relay controls is often marked on the top of the relay, but the decal or imprint inside the cover of the relay box should also indicate which circuits they control. To test a relay, connect an ohmmeter across the two terminals of the power circuit. Continuity should not be indicated. Now connect a fused jumper wire between one of the two control circuit terminals and the positive battery terminal. Connect another jumper wire between the other control circuit terminal and ground. When the connections are made, the relay should click and continuity should be indicated on the meter. If the relay fails the test, replace it.
Flasher Assy, Turn Signal
81980-12070
Q: How do relays work in electrical system, and how can I test and diagnose relay-related issues on 1997 through 2001 Toyota Avalon?
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.