What role do Relay Boxes play in the operation of electrical accessories on Volkswagen Jetta?

A number of electrical items in the car such as the fuel injection, horns, starter and the fog lamps use relays to send electrical signals to the parts. The principle of operation of relays is that a small current, called the control circuit, is used to switch the current of a large current, called the power circuit. The faulty relay will lead to inappropriate functioning of the component in question. In most cases, the majority of the relays are mounted in the engine compartment fuse/relay box.

What are the functions and testing methods of Relay Boxes in vehicle electrical systems on Volkswagen Passat?

The vehicle has a number of electrical accessories that use relays to transmit electrical signals to the components including the fuel injection system, horns, starter, and the fog lamps. Relays are controlled by a low-current control circuit to open and close a high-current power circuit and when a relay is faulty, the power component it operates will not work. Relays are mostly found in the under-dash fuse/relay box and these can be taken out and either tested or replaced as a unit in case of a suspected faulty relay. The relays in question are typically known as the ISO relays, and its numbered terminals reflect the general connection and purpose in the circuit. The relay control circuit has two terminals, one of which is connected to the coil of the relay, and the other to the power circuit. Energized, the coil produces a magnetic field which has the effect of closing the larger contacts of a power circuit supplying power to the loads in the circuit. The control circuit is usually considered to be terminal 85 and terminal 86 and certain connections are necessary when a diode or resistor is involved. Terminal 30 goes to the battery voltage source to be loaded into the circuit and terminal 87 is connected to the ground side of the circuit. An ohmmeter may be used to test the continuity through the relay control coil, to ensure that there are appropriate resistance values in either direction. Also, continuity is not to be existent between terminal 30 and 87 under the de-energizing condition of the relay. The functionality can be verified by hooking jumper wires to the corresponding terminals and ensuring that there is continuity between the power circuit terminals. When the relay passes all these tests, it is a good relay but fails to pass any of them, then it is replaced.

Genuine Volkswagen Relay Boxes

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45 Relay Boxes found

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Volkswagen Relay Box Part Number: 5Q0-937-503-B
$26.03 MSRP: $43.39
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Product Specifications
- Other Name: Plate
Fits the following Volkswagen Models:
- Golf | 2015 | TDI S, TDI SE, TDI SEL | 4 Cyl 2.0 L DIESEL
- Golf SportWagen | 2015 | TDI S, TDI SE, TDI SEL | 4 Cyl 2.0 L DIESEL
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Volkswagen Junction Block Part Number: 5WA-937-615
$26.51 MSRP: $44.18
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Product Specifications
- Other Name: Plate
Fits the following Volkswagen Models:
- Atlas | 2024 | Peak Edition SE, Peak Edition SEL, SE, SEL, SEL Premium R-Line | 4 Cyl 2.0 L GAS
- Atlas Cross Sport | 2024 | SE, SEL, SEL Premium R-Line, SEL R-Line | 4 Cyl 2.0 L GAS
- GTI | 2022-2024 | 40th Anniversary Edition, Autobahn, S, SE | 4 Cyl 2.0 L GAS
- Golf R | 2022-2023 | 20th Anniversary Edition, Base | 4 Cyl 2.0 L GAS
- ID.4 | 2021-2023 | 1st Edition, Pro, Pro S, Pro S Plus, S, Standard | BATTERY EV (EV/BEV)
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Volkswagen Relay Box Part Number: 1J0-941-385-A-01C
$28.79 MSRP: $47.98
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Product Specifications
- Other Name: Box; Upper Cover
Fits the following Volkswagen Models:
- Golf | 1999-2006 | GL, GL TDI, GLS, GLS TDI, GTI, GTI 1.8T, GTI 20th Anniversary, GTI 337, GTI GLS, GTI GLX, GTI VR6, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Jetta | 1999-2005 | GL, GL TDI, GLI, GLS, GLS TDI, GLX, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Relay Box Part Number: 1J0-941-393-B-B41
$28.79 MSRP: $47.98
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Product Specifications
- Other Name: Box; Lower Cover
Fits the following Volkswagen Models:
- Golf | 1999-2006 | GL, GL TDI, GLS, GLS TDI, GTI, GTI 1.8T, GTI 20th Anniversary, GTI 337, GTI GLS, GTI GLX, GTI VR6, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Jetta | 1999-2005 | GL, GL TDI, GLI, GLS, GLS TDI, GLX, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Relay Box Part Number: 5QA-937-507
$2.61 MSRP: $4.28
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Product Specifications
- Other Name: Plate; Relay Box
Fits the following Volkswagen Models:
- Atlas | 2018-2023 | Launch Edition, S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- Taos | 2022-2024 | S, SE, SEL | 4 Cyl 1.5 L GAS
- Tiguan | 2018-2024 | S, SE, SE R-Line Black, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Jet Black | 4 Cyl 2.0 L GAS
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Volkswagen Fuse & Relay Box Part Number: 5C0-937-125-A
$49.91 MSRP: $69.33
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Product Specifications
- Other Name: Plate
Fits the following Volkswagen Models:
- Passat | 2016-2017 | SE, SEL Premium | 6 Cyl 3.6 L GAS
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Volkswagen Housing Part Number: 5Q0-907-361-D
$58.43 MSRP: $81.16
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Product Specifications
- Other Name: Fuse & Relay Box
Fits the following Volkswagen Models:
- Arteon | 2019-2021 | SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line | 4 Cyl 2.0 L GAS
- Atlas | 2019-2023 | S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- Atlas Cross Sport | 2020-2023 | S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- GTI | 2018-2021 | Autobahn, Rabbit Edition, S, SE | 4 Cyl 2.0 L GAS
- Golf | 2018-2021 | S, SE, TSi | 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS
- Golf Alltrack | 2018-2019 | S, SE, SEL | 4 Cyl 1.8 L GAS
- Golf R | 2018-2019 | Base | 4 Cyl 2.0 L GAS
- Golf SportWagen | 2018-2019 | S, SE, SEL | 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS
- Taos | 2022-2024 | S, SE, SEL | 4 Cyl 1.5 L GAS
- Tiguan | 2018-2024 | S, SE, SE R-Line Black, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Jet Black | 4 Cyl 2.0 L GAS
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Volkswagen Housing Part Number: 5Q0-907-361-G
$58.43 MSRP: $81.16
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Product Specifications
- Other Name: Fuse & Relay Box
- Replaces: 5Q0-907-361-C
Fits the following Volkswagen Models:
- Arteon | 2019-2021 | SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line | 4 Cyl 2.0 L GAS
- Atlas | 2018-2023 | Launch Edition, S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- Atlas Cross Sport | 2020-2023 | S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- GTI | 2015-2017 | Autobahn, S, SE, Sport | 4 Cyl 2.0 L GAS
- Golf | 2015-2017 | Base, Launch Edition, S, SE, SEL, TDI S, TDI SE, TDI SEL, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL
- Golf Alltrack | 2017 | S, SE, SEL | 4 Cyl 1.8 L GAS
- Golf R | 2015-2017 | Base | 4 Cyl 2.0 L GAS
- Golf SportWagen | 2015-2017 | Limited Edition, S, SE, SEL, TDI S, TDI SE, TDI SEL | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL
- e-Golf | 2015-2017 | Limited Edition, SE, SEL Premium | BATTERY EV (EV/BEV)
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Volkswagen Fuse & Relay Box Part Number: 5WD-937-125-D
$45.59 MSRP: $63.31
You Save: $17.72 (28%)
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Product Specifications
- Other Name: E Box
Fits the following Volkswagen Models:
- ID.4 | 2023 | Pro, Pro S, Pro S Plus, S, Standard | BATTERY EV (EV/BEV)
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Volkswagen Fuse & Relay Box Part Number: 3D0-937-499-B
$78.53 MSRP: $109.98
You Save: $31.45 (29%)
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Product Specifications
- Other Name: Plate
Fits the following Volkswagen Models:
- Phaeton | 2004-2006 | V8, W12 | 12 Cyl 6.0 L GAS, 8 Cyl 4.2 L GAS
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Volkswagen Fuse & Relay Box Part Number: 5C0-937-125-C
$79.72 MSRP: $111.65
You Save: $31.93 (29%)
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Product Specifications
- Other Name: Plate
Fits the following Volkswagen Models:
- Passat | 2014-2022 | Limited Edition, R-Line, S, SE, SE R-Line, SEL, SEL Premium, Sport, TDI SE, TDI SEL Premium, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Module Part Number: 03L-907-281
$84.95 MSRP: $118.99
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Product Specifications
- Other Name: Control Unit; Module
- Replaced by: 038-907-281-D
Fits the following Volkswagen Models:
- Golf | 2010-2014 | TDI | 4 Cyl 2.0 L DIESEL
- Jetta | 2010-2014 | S, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS
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Volkswagen Fuse & Relay Box Part Number: 1J0-937-617-B
$108.29 MSRP: $151.67
You Save: $43.38 (29%)
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Product Specifications
- Other Name: Holder
Fits the following Volkswagen Models:
- Golf | 1999-2001 | GL, GLS, GTI, GTI GLS, GTI GLX, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Fuse & Relay Box Part Number: 5Q0-937-125-D
$157.07 MSRP: $219.99
You Save: $62.92 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: E Box; Fuse & Relay Box, Fuse Box Main, Relay Fuse Plate
Fits the following Volkswagen Models:
- Arteon | 2019-2020 | SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line | 4 Cyl 2.0 L GAS
- Atlas | 2019-2023 | S, SE, SE R-Line, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Black | 4 Cyl 2.0 L GAS, 6 Cyl 3.6 L GAS
- GTI | 2018-2021 | Autobahn, Rabbit Edition, S, SE | 4 Cyl 2.0 L GAS
- Golf | 2018-2021 | S, SE, TSi | 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS
- Golf Alltrack | 2018-2019 | S, SE, SEL | 4 Cyl 1.8 L GAS
- Golf R | 2018-2019 | Base | 4 Cyl 2.0 L GAS
- Golf SportWagen | 2018-2019 | S, SE, SEL | 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS
- Jetta | 2019-2024 | GLI 35th Anniversary Edition, GLI Autobahn, GLI S, R-Line, S, SE, SEL, SEL Premium, Sport | 4 Cyl 1.4 L GAS, 4 Cyl 1.5 L GAS, 4 Cyl 2.0 L GAS
- Tiguan | 2018-2024 | S, SE, SE R-Line Black, SEL, SEL Premium, SEL Premium R-Line, SEL R-Line, SEL R-Line Jet Black | 4 Cyl 2.0 L GAS
- e-Golf | 2018-2019 | SE, SEL Premium | BATTERY EV (EV/BEV)
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Volkswagen Fuse & Relay Box Part Number: 1C0-937-617
$172.54 MSRP: $241.65
You Save: $69.11 (29%)
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Product Specifications
- Other Name: Holder
Fits the following Volkswagen Models:
- Jetta | 1999-2001 | GL, GLS, GLX, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Fuse & Relay Box Part Number: 1J0-937-617-D
$172.54 MSRP: $241.64
You Save: $69.10 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Holder
Fits the following Volkswagen Models:
- Golf | 2002-2006 | GL, GL TDI, GLS, GLS TDI, GTI 1.8T, GTI 20th Anniversary, GTI 337, GTI VR6, TDI | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
- Jetta | 2002-2005 | GL, GL TDI, GLI, GLS, GLS TDI, GLX, TDI, Wolfsburg Edition | 4 Cyl 1.8 L GAS, 4 Cyl 1.9 L DIESEL, 4 Cyl 2.0 L GAS, 6 Cyl 2.8 L GAS
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Volkswagen Fuse & Relay Box Part Number: 1K0-937-125-A
$180.87 MSRP: $253.32
You Save: $72.45 (29%)
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Product Specifications
- Other Name: Plate; Relay Fuse Plate
- Replaces: 1K0-937-125, 000-937-125
Fits the following Volkswagen Models:
- Eos | 2009 | Komfort, Lux | 4 Cyl 2.0 L GAS
- Jetta | 2009-2010 | GLI, S, SE, SEL, TDI, TDI Cup Edition, Wolfsburg Edition | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS
- Rabbit | 2006-2009 | 2.5, S | 5 Cyl 2.5 L GAS
- Tiguan | 2009 | S, SE, SEL | 4 Cyl 2.0 L GAS
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Volkswagen Fuse & Relay Box Part Number: 5C0-937-819-K
$195.15 MSRP: $273.31
You Save: $78.16 (29%)
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Product Specifications
- Other Name: Plate
- Replaces: 5C0-937-819-A
Fits the following Volkswagen Models:
- Jetta | 2011-2018 | Base, GLI, GLI SE, GLI SEL, Hybrid, Hybrid SE, Hybrid SEL, Hybrid SEL Premium, S, SE, SE Sport, SEL, SEL Premium, Sport, TDI, TDI Premium, TDI S, TDI SE, TDI SEL, Wolfsburg Edition | 4 Cyl 1.4 L FULL HYBRID EV-GAS (FHEV), 4 Cyl 1.4 L GAS, 4 Cyl 1.8 L GAS, 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS
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Volkswagen Fuse & Relay Box Part Number: 5C0-937-819-E
$229.66 MSRP: $321.65
You Save: $91.99 (29%)
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Product Specifications
- Other Name: Plate
Fits the following Volkswagen Models:
- Passat | 2012-2015 | SE, SEL Premium | 6 Cyl 3.6 L GAS
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Volkswagen Fuse & Relay Box Part Number: 1K0-937-125-D
$233.23 MSRP: $326.65
You Save: $93.42 (29%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Plate; Relay Fuse Plate
- Replaces: 1K0-937-125-B, 1K0-937-125-C
Fits the following Volkswagen Models:
- Eos | 2010-2016 | Executive, Final Edition, Komfort, Lux, Sport | 4 Cyl 2.0 L GAS
- GTI | 2010-2014 | Base, Driver's Edition, Wolfsburg Edition | 4 Cyl 2.0 L GAS
- Golf | 2010-2014 | Base, TDI | 4 Cyl 2.0 L DIESEL, 5 Cyl 2.5 L GAS
- Jetta | 2010-2014 | S, SE, SEL, TDI | 4 Cyl 2.0 L DIESEL, 4 Cyl 2.0 L GAS, 5 Cyl 2.5 L GAS
- Tiguan | 2009-2011 | S, SE, SEL, Wolfsburg Edition | 4 Cyl 2.0 L GAS
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Volkswagen Relay Boxes

A total system failure could result from a malfunctioning Volkswagen Relay Box, reducing driving comfort and posing a danger. It is for this reason that you should conduct regular inspections and replace such components in good time to enable your car to run smoothly and safely. OEM (Original Equipment Manufacturer) Volkswagen Relay Boxes are perfect for motorists because they are the best quality parts produced as per the manufacturer's specifications; hence, they perform well and are reliable too, thus helping to retain the car's initial functionality as well as safety features. At VWPartsGiant.com, our genuine Volkswagen Relay Box supply indicates how much we care about the health of your vehicle. Additionally, our stock is vast, so every product will be easily accessible to you for finding and swapping without fear of making mistakes. With our user-friendly online catalog, it takes no time to identify the right spare part. Therefore, convenience accompanies servicing or maintaining a motorcar. You can rely on our OEM Volkswagen Relay Box to sustain the performance of your automobile.

Volkswagen Relay Boxes Parts and Q&A

Module
03L-907-281
Q: What role do Relay Boxes play in the operation of electrical accessories on Volkswagen Jetta?
A:
A number of electrical items in the car such as the fuel injection, horns, starter and the fog lamps use relays to send electrical signals to the parts. The principle of operation of relays is that a small current, called the control circuit, is used to switch the current of a large current, called the power circuit. The faulty relay will lead to inappropriate functioning of the component in question. In most cases, the majority of the relays are mounted in the engine compartment fuse/relay box.
Fuse & Relay Box
8L0-941-822-A
Q: What are the functions and testing methods of Relay Boxes in vehicle electrical systems on Volkswagen Passat?
A:
The vehicle has a number of electrical accessories that use relays to transmit electrical signals to the components including the fuel injection system, horns, starter, and the fog lamps. Relays are controlled by a low-current control circuit to open and close a high-current power circuit and when a relay is faulty, the power component it operates will not work. Relays are mostly found in the under-dash fuse/relay box and these can be taken out and either tested or replaced as a unit in case of a suspected faulty relay. The relays in question are typically known as the ISO relays, and its numbered terminals reflect the general connection and purpose in the circuit. The relay control circuit has two terminals, one of which is connected to the coil of the relay, and the other to the power circuit. Energized, the coil produces a magnetic field which has the effect of closing the larger contacts of a power circuit supplying power to the loads in the circuit. The control circuit is usually considered to be terminal 85 and terminal 86 and certain connections are necessary when a diode or resistor is involved. Terminal 30 goes to the battery voltage source to be loaded into the circuit and terminal 87 is connected to the ground side of the circuit. An ohmmeter may be used to test the continuity through the relay control coil, to ensure that there are appropriate resistance values in either direction. Also, continuity is not to be existent between terminal 30 and 87 under the de-energizing condition of the relay. The functionality can be verified by hooking jumper wires to the corresponding terminals and ensuring that there is continuity between the power circuit terminals. When the relay passes all these tests, it is a good relay but fails to pass any of them, then it is replaced.