{"id":42657,"date":"2021-08-06T02:52:59","date_gmt":"2021-08-06T09:52:59","guid":{"rendered":"https:\/\/blogv2prod.wpenginepowered.com\/blog\/?p=42657"},"modified":"2026-02-18T01:13:37","modified_gmt":"2026-02-18T09:13:37","slug":"bad-headlight-relay-symptoms-and-faq","status":"publish","type":"post","link":"https:\/\/www.carparts.com\/blog\/bad-headlight-relay-symptoms-and-faq\/","title":{"rendered":"Bad Headlight Relay Symptoms and FAQ"},"content":{"rendered":"<!DOCTYPE html PUBLIC \"-\/\/W3C\/\/DTD HTML 4.0 Transitional\/\/EN\" \"http:\/\/www.w3.org\/TR\/REC-html40\/loose.dtd\">\n<html><body><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span><style>.kadence-column42657_b54b29-0f > .kt-inside-inner-col,.kadence-column42657_b54b29-0f > .kt-inside-inner-col:before{border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;}.kadence-column42657_b54b29-0f > .kt-inside-inner-col{column-gap:var(--global-kb-gap-sm, 1rem);}.kadence-column42657_b54b29-0f > .kt-inside-inner-col{flex-direction:column;}.kadence-column42657_b54b29-0f > .kt-inside-inner-col > .aligncenter{width:100%;}.kadence-column42657_b54b29-0f > .kt-inside-inner-col:before{opacity:0.3;}.kadence-column42657_b54b29-0f{position:relative;}@media all and (max-width: 1024px){.kadence-column42657_b54b29-0f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}@media all and (max-width: 767px){.kadence-column42657_b54b29-0f > .kt-inside-inner-col{flex-direction:column;justify-content:center;}}<\/style>\n<div class=\"wp-block-kadence-column kadence-column42657_b54b29-0f inner-column-1 qk-look-widget\"><div class=\"kt-inside-inner-col\">\n<div class=\"wp-block-ultimate-post-row ultp-block-326b0c  qk-main-wrap\"><div class=\"ultp-row-wrapper\"><div class=\"ultp-row-content\">\n<div class=\"wp-block-ultimate-post-column ultp-block-6125a8\"><div class=\"ultp-column-wrapper\"><style>.wp-block-kadence-advancedheading.kt-adv-heading42657_843e4b-14, .wp-block-kadence-advancedheading.kt-adv-heading42657_843e4b-14[data-kb-block=\"kb-adv-heading42657_843e4b-14\"]{text-align:center;font-size:20px;font-style:normal;}.wp-block-kadence-advancedheading.kt-adv-heading42657_843e4b-14 mark.kt-highlight, .wp-block-kadence-advancedheading.kt-adv-heading42657_843e4b-14[data-kb-block=\"kb-adv-heading42657_843e4b-14\"] mark.kt-highlight{font-family:Inter;font-weight:500;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}.wp-block-kadence-advancedheading.kt-adv-heading42657_843e4b-14 img.kb-inline-image, .wp-block-kadence-advancedheading.kt-adv-heading42657_843e4b-14[data-kb-block=\"kb-adv-heading42657_843e4b-14\"] img.kb-inline-image{width:150px;vertical-align:baseline;}<\/style>\n<div class=\"kt-adv-heading42657_843e4b-14 summary-title wp-block-kadence-advancedheading\" data-kb-block=\"kb-adv-heading42657_843e4b-14\"><span>Summary<\/span><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Your headlights won&rsquo;t turn on or off once your relay is faulty. If your vehicle is equipped with concealed headlights, it also won&rsquo;t raise if your relay is bad.<\/li>\n\n\n\n<li>A relay is basically an electromagnetic switch that uses low current to control a higher current circuit. Inside a relay, you&rsquo;ll find a coil and a switching mechanism with a set of contacts.<\/li>\n\n\n\n<li>&nbsp;A headlight relay generally costs less than $30 for just the part itself.<\/li>\n<\/ul>\n<\/div><\/div>\n<\/div><\/div><\/div>\n<\/div><\/div>\n\n\n\n\n\n<p>Vehicles with computer-controlled <a href=\"https:\/\/www.carparts.com\/blog\/car-lights\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"headlight systems\">headlight systems<\/a> often use relays to control the low beams and the high beams. Like any other type of relay, the headlight relays can eventually fail. When that happens, the headlights will no longer work as they should, which is a problem you&rsquo;ll want to address right away.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">What Does a Headlight Relay Do?<\/h2>\n\n\n\n<p>A relay is basically an electromagnetic switch that uses low current to control a higher current circuit. Inside a relay, you&rsquo;ll find a coil and a switching mechanism with a set of contacts. Most automotive relays are normally open, meaning current does not flow between the contacts until the relay is activated.<\/p>\n\n\n\n    <div class=\"ai-summary-widget\">\n\n        <div class=\"ai-summary-grid\">\n\n            <div>\n                <div class=\"ai-avatar\">\n                    <figure>\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/ai-summary\/ai-bot\" alt=\"AI robot\">\n                    <\/figure>\n                    <span>ELI5<\/span>\n                <\/div>\n            <\/div>\n            <div>\n                <p>Imagine that your headlight is like a very powerful light. Your switch on the dashboard is too small and weak to turn the big lamp on and off. The headlight switch is small and can't handle all that power by itself &ndash; it's like trying to use your pinky finger to lift a big elephant! It could get hurt. So, we use a helper called a \"relay.\"  The relay is like a strong friend who helps the little switch.  When you flip the little switch, it's like you're tapping your strong friend on the shoulder.  The strong friend (the relay) then uses its own big muscles to turn on the super-duper bright lamp (the headlight).<\/p>    \n            <\/div>\n\n        <\/div>\n\n        <div class=\"ai-summary-tooltip\">   \n            <p>Not everyone is an auto repair expert. <strong>ELI5 (&ldquo;Explain Like I&rsquo;m Five&rdquo;)<\/strong> provides layperson-friendly explanations of complex automotive concepts, systems, &amp; parts, so you can fully understand their importance. Great for casual car owners and DIY beginners! Powered by AI.<\/p>\n        <\/div>\n\n    <\/div>\n\n\n\n<p>In a typical computer-controlled headlight circuit, two relays&mdash;one for the high beams and one for the low beams&mdash;control the headlights. Some vehicles also have a third headlight relay to activate the <a href=\"https:\/\/www.carparts.com\/blog\/drl-system-hot-it-works-and-replacement-guide\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"daytime running lights\">daytime running lights<\/a> (the dimly lit headlights that automatically come on during the day).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"682\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-1024x682.jpg\" alt=\"car electromagnetic relay switches isolated\" class=\"wp-image-42660\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-1024x682.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-300x200.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-768x512.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-1536x1024.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-600x400.jpg 600w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated-150x100.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/car-electromagnetic-relay-switch-isolated.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">A relay is basically an electromagnetic switch that uses low current to control a higher current circuit.<\/figcaption><\/figure>\n\n\n\n<p>When low beam activation is requested via the headlight switch, a signal is sent to a computer, which is often referred to as the body control module (BCM). The BCM responds by supplying ground to the coil inside the relay, causing current to flow through the coil. The current flowing through the coil creates a magnetic field that pulls the relay&rsquo;s contacts closed. Current then travels across the contacts to the headlight assembly, causing the low beams to turn on.<\/p>\n\n\n\n<p>It&rsquo;s worth noting that not all computer-controlled headlight systems use relays. For example, in some systems, the BCM sends a request for headlight activation to a type of smart fuse box, often referred to as an integrated power module (IPM). Once the IPM receives the request from the BCM, it uses integrated drivers to activate the low beams.<\/p>\n\n\n\n<p>Also, older headlight systems that are not computer-controlled generally do not have headlight relays. Instead, current typically flows directly from the headlight switch to the headlights through the <a href=\"https:\/\/www.carparts.com\/blog\/what-is-a-car-dimmer-switch\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"dimmer switch\">dimmer switch<\/a>.<\/p>\n\n\n\n<div id=\"article-search-widget\">\n<div class=\"cp-search\">\n<div align=\"center\">\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/w_auto,dpr_auto\/carparts\/logos\/badge_wordmark\/full_color\/CP_LOGO_COLOUR_RGB\" alt=\"CarParts.com\" width=\"300\" height=\"56\">\n<\/div>\n<form id=\"cpsearchform\" name=\"cpsearchform\" action=\"https:\/\/www.carparts.com\/search\" method=\"get\" target=\"_blank\" accept-charset=\"character_set\" aria-label=\"search CarParts.com\">\n    <input type=\"text\" class=\"keyword\" name=\"q\" placeholder=\"Search for parts on CarParts.com\" value=\"\" aria-label=\"Search CarParts.com\"><input type=\"submit\" class=\"btn-search\" value=\"Search\" aria-label=\"Search\">\n<\/form>\n<\/div>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What are the Symptoms of a Bad Headlight Relay?<\/h2>\n\n\n\n<p>When the headlight relay goes bad, the headlights won&rsquo;t work properly. As a result, you&rsquo;ll notice one of the following symptoms.<\/p>\n\n\n\n<p><em><strong>Note: <\/strong>Because other problems can present the same symptoms as a bad relay, you&rsquo;ll want to perform a thorough diagnosis of the vehicle before replacing any parts.<\/em><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Headlights Don&rsquo;t Turn On<\/h3>\n\n\n\n<p>The most common sign of a bad headlight relay is headlights that don&rsquo;t work. A headlight relay will typically fail in the open position, preventing voltage from reaching the headlights. If the low beam relay fails, the low beams won&rsquo;t work. Likewise, if the high beam relay fails, the high beams won&rsquo;t work, and if the daytime running light (DRL) relay fails, the DRLs won&rsquo;t work.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Headlights Won&rsquo;t Turn off<\/h3>\n\n\n\n<figure class=\"wp-block-image size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"768\" src=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-1024x768.jpg\" alt=\"Subaru Outback with headlight on\" class=\"wp-image-42661\" srcset=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-1024x768.jpg 1024w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-300x225.jpg 300w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-768x576.jpg 768w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-1536x1152.jpg 1536w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-928x696.jpg 928w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on-150x113.jpg 150w, https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/Subaru-Outback-with-headlight-on.jpg 1700w\" sizes=\"(max-width: 1024px) 100vw, 1024px\"><figcaption class=\"wp-element-caption\">There are instances where a faulty headlight relay can stick closed, preventing the headlights from turning off.<\/figcaption><\/figure>\n\n\n\n<p>Although somewhat rare, there are instances where a faulty headlight relay can stick closed, preventing the headlights from turning off. The problem can happen in circuits that supply power to the headlight relay at all times.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Concealed Headlights Don&rsquo;t Work Properly<\/h3>\n\n\n\n<p>Some cars (usually sports cars) have concealed headlights that pop up when activated. On modern vehicles, the concealed headlights are computer-controlled units that are activated by a relay. If that relay fails in the open position, the concealed headlights will not raise.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Headlight Relay FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How to Test a Headlight Relay<\/strong><\/h3>\n\n\n\n<p>Automotive relays are often very similar. The easiest way to test a headlight relay is to temporarily swap it with another (unimportant) relay from the power distribution box. For example, you might swap the headlight relay with the air conditioning compressor relay if the two relays share the same design. If the headlights work with the alternate relay installed, you know the headlight relay needs to be replaced.<\/p>\n\n\n\n    <div class=\"perspective-widget\">\n        <div class=\"pt-child-wrap\">\n\n            <div class=\"pt-col-item1\">\n                <figure class=\"aligncenter size-large\">\n                        <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/dpr_auto,f_auto,q_auto\/carparts\/blog\/plugins\/amp\/avatar-comments\" class=\"com-thumb\" alt=\"Avatar of CarParts.com Research Team\" width=\"100\" height=\"100\">\n                <\/figure>\n                <p>\n                    <strong>CarParts.com Research Team<\/strong> \n                    <span>User<\/span>\n                <\/p>\n            <\/div>\n\n            <div class=\"pt-col-item2\">\n                <div class=\"protip-desc\">\n                    <div class=\"perspective-help-tip\">   \n                        <p>There&rsquo;s more than one way to look at an issue. &ldquo;Community Perspectives&rdquo; highlight authentic personal viewpoints and real-life experiences by the CarParts.com community, including our readers, experts, and product specialists, among others. This can help you make better informed decisions about your car.<\/p>\n                    <\/div>\n                    <div class=\"perspective-help-caption tooltip\"> \n                        <h2>CarParts.com Community Perspectives<\/h2>\n                        <p>If the driver&rsquo;s side headlight on a 2004 RAV 4 is dim, you might want to start by checking whether it has a good ground. The grounding point should be G109, near the right radiator support<\/p>\n                        <div class=\"cta-btn\">\n                            <a href=\"https:\/\/www.carparts.com\/blog\/bad-headlight-relay-symptoms-and-faq\/#commentform\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Jump to Discussions\">Jump to Discussions<\/a>\n                        <\/div>\n                    <\/div>\n                <\/div>\n            <\/div>\n\n        <\/div>\n    <\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What is the Headlight Relay&rsquo;s Location?<\/strong><\/h3>\n\n\n\n<p>The headlight relay is typically located in the&nbsp;<strong>power distribution box<\/strong>&nbsp;in the engine compartment. Consult your owner&rsquo;s manual if you need help finding the relay.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>How Much to Replace a Headlight Relay?<\/strong><\/h3>\n\n\n\n<p>Replacing a headlight relay is a DIY-friendly repair that you can usually do yourself. A headlight relay generally costs&nbsp;<strong>less than $30<\/strong>&nbsp;for just the part itself. Of course, the exact cost will vary depending on a variety of factors, such as the year, make, and model of your vehicle.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Finding a New Headlight Relay for Your Vehicle<\/h2>\n\n\n\n<p>The longer you drive with a faulty headlight relay, the higher the risk of you getting into an accident. It&rsquo;s dangerous to hold off on getting a new headlight relay because it can limit what you see when you drive at night. Fortunately, getting a replacement that works with your vehicle is easy with CarParts.com.<\/p>\n\n\n\n<p>Visit <a href=\"https:\/\/www.carparts.com\/\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"CarParts.com\">CarParts.com<\/a> with your computer or your mobile phone. Then, enter your ride&rsquo;s year, make, and model into the vehicle selector to view compatible headlight relays. Adjust the filters to limit the catalog to your preferred brands and price range.<\/p>\n\n\n\n<p>All our headlight relays are on hand, ready to ship, and available at unbeatable prices to give you the best value for your money. Find exactly what you need and check out securely in minutes.&nbsp;<br>Don&rsquo;t drive with a bad headlight relay for too long. Check out our wide selection of <a href=\"https:\/\/www.carparts.com\/headlight-relay\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"headlight relays\">headlight relays<\/a> and shop now!<\/p>\n\n\n\n<div class=\"shop-project\">\n\n    <h2>Shop this Project<\/h2>\n\n    <ul class=\"shop-project-list\">\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-rept100389\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-rept100389_1\" alt=\"Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, LED\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-rept100389_1\" alt=\"Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, LED\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-rept100389\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, LED\">Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, LED<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-5.svg\" alt=\"5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$189.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-rept100389\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-c100167\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-c100167_1\" alt=\"Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, Halogen\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-c100167_1\" alt=\"Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, Halogen\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-c100167\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, Halogen\">Replacement &ndash; Driver and Passenger Side Headlights, with Bulbs, Halogen<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$134.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-c100167\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-repcd100101\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-repcd100101_1\" alt=\"Replacement &ndash; Driver and Passenger Side Headlights, without Bulbs, HID\/Xenon, Clear Lens, without HID Bulbs and Ballast\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/set-repcd100101_1\" alt=\"Replacement &ndash; Driver and Passenger Side Headlights, without Bulbs, HID\/Xenon, Clear Lens, without HID Bulbs and Ballast\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-repcd100101\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Replacement &ndash; Driver and Passenger Side Headlights, without Bulbs, HID\/Xenon, Clear Lens, without HID Bulbs and Ballast\">Replacement &ndash; Driver and Passenger Side Headlights, without Bulbs, HID\/Xenon, Clear Lens, without HID Bulbs and Ballast<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-4.5.svg\" alt=\"4.5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$619.99<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight\/replacement\/set-repcd100101\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n        \n        <li>\n            <div class=\"shop-project-item\">\n                <div class=\"stp-image-url\">\n                    <a href=\"https:\/\/www.carparts.com\/details\/headlight-relay\/standard\/siry90\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label='&lt;img src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/siry90_1\" alt=\"Standard&reg; &ndash; RY-90 Standard OE Replacement Headlight Relay\" \/&gt;'><img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/images\/siry90_1\" alt=\"Standard&reg; &ndash; RY-90 Standard OE Replacement Headlight Relay\"><\/a>\n                <\/div>\n\n                <div class=\"stp-desc\">\n                                            <p class=\"stp-title\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight-relay\/standard\/siry90\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Standard&reg; &ndash; RY-90 Standard OE Replacement Headlight Relay\">Standard&reg; &ndash; RY-90 Standard OE Replacement Headlight Relay<\/a>\n                        <\/p>\n                    \n                    <div class=\"stp-stars\">\n                        <img decoding=\"async\" src=\"https:\/\/cld.partsimg.com\/image\/upload\/q_auto,dpr_auto,f_auto\/carparts\/blog\/widgets\/shop-project\/stars\/star-5.svg\" alt=\"5 Stars\">\n                    <\/div>\n\n                                            <p class=\"stp-price\">$44.14<\/p>\n                    \n                    <p><small>Price and rating may change from the time content is published.<\/small><\/p>\n\n                                            <p class=\"stp-cta\">\n                            <a href=\"https:\/\/www.carparts.com\/details\/headlight-relay\/standard\/siry90\" target=\"_blank\" rel=\"noreferrer noopener\" aria-label=\"Shop Now\">Shop Now<\/a>\n                        <\/p>\n                                    <\/div>\n\n            <\/div>\n        <\/li>\n\n            <\/ul>\n<\/div>\n\n\n<\/body><\/html>\n","protected":false},"excerpt":{"rendered":"<p><span class=\"span-reading-time rt-reading-time\" style=\"display: block;\"><span class=\"rt-label rt-prefix\">Reading Time: <\/span> <span class=\"rt-time\"> 4<\/span> <span class=\"rt-label rt-postfix\">minutes<\/span><\/span>Vehicles with computer-controlled headlight systems often use relays to control the low beams and the high beams. Like any other&#8230; <a href=\"https:\/\/www.carparts.com\/blog\/bad-headlight-relay-symptoms-and-faq\/\" rel=\"nofollow\">Read More<\/a><\/p>\n","protected":false},"author":1643,"featured_media":42659,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[3745,52],"tags":[3318,3316,3082],"ppma_author":[2622],"class_list":{"0":"post-42657","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-car-lights","8":"category-diy","9":"tag-car-lights-all-articles","10":"tag-car-lights-recommended","11":"tag-headlight-relay","12":"entry"},"acf":{"adrotate_specific_mobile_ad":"","adrotate_specific_desktop_ad":""},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Bad Headlight Relay Symptoms and FAQ - In The Garage with CarParts.com<\/title>\n<meta name=\"description\" content=\"When headlight relays go bad, the headlights won\u2019t work properly. 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Learn the symptoms of a bad headlight relay and answers to FAQs here.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.carparts.com\/blog\/bad-headlight-relay-symptoms-and-faq\/\" \/>\n<meta property=\"og:site_name\" content=\"In The Garage with CarParts.com\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/carpartscom\" \/>\n<meta property=\"article:published_time\" content=\"2021-08-06T09:52:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-02-18T09:13:37+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.carparts.com\/blog\/wp-content\/uploads\/2021\/08\/automotive-multiple-rows-of-different-fuses-one-connector-and-part-of-a-relay.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1700\" \/>\n\t<meta property=\"og:image:height\" content=\"982\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Mia Bevacqua, ASE Certified Master Automobile Technician\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:site\" content=\"@carpartscom\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Mia Bevacqua, ASE Certified Master Automobile Technician\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/bad-headlight-relay-symptoms-and-faq\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.carparts.com\\\/blog\\\/bad-headlight-relay-symptoms-and-faq\\\/\"},\"author\":[{\"@type\":\"Person\",\"$id\":\"1643\",\"name\":\"Mia Bevacqua\",\"jobTitle\":\"ASE Master Automobile Technician\",\"description\":\"Mia Bevacqua has over 14 years of experience in the auto industry and holds a bachelor\u2019s degree in Advanced Automotive Systems. 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