Automotive replacement headlamp relays are crucial components that manage the power supply to a vehicle's headlights, ensuring consistent illumination and protecting the electrical system. These relays are typically used to restore proper headlight function, address issues like dimming, flickering, or complete failure, and in some cases, upgrade the existing wiring for improved performance. Products were evaluated based on compatibility, functionality (single relay vs. wiring harness), durability features like heat dissipation, user reviews, and feature analysis.
[ALL STAR TRUCK PARTS] 4-Headlight Relay Wiring Harness H4 Headlamp Light Bulb Ceramic Socket Plugs Set
This wiring harness comprehensively addresses common headlight issues such as dimming, flickering, and overloading, offering a complete solution.
Search on AmazonWMAutoPart Headlamp Relay 1R1489
The WMAutoPart relay provides essential heat dissipation and short-circuit protection, making it a reliable and straightforward replacement option.
Search on AmazonDenso 567-0003 4-Prong Headlight Relay for Lexus/Toyota with Grey Color Code
The Denso 4-Prong Headlight Relay offers OEM-grade quality and a precise fit for specific Lexus/Toyota models, often preferred for direct, high-standard replacements.
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- THREE-PIECE VALUE PACK — Includes 3 matching electronic headlight relay modules marked 15016745 so one can be installed and two kept as ready spares; compatible with select TrailBlazer, Envoy, Rainier, Ascender, Bravada, 9-7X and Grand Prix applications...
- LOW-BEAM AND DRL CONTROL — Intended for the correct under-hood fuse-block position that switches low-beam headlamps or daytime running lights; the actual assignment depends on the vehicle wiring and fuse-box diagram
- SYMPTOMS TO DIAGNOSE — May help when both low beams stay off while high beams work, lamps flicker or cut out intermittently, or low-beam and DRL switching is incorrect only when the relay module has been confirmed as the failed component
- MATCHING 4-PIN MODULES — Each relay uses 12V DC power, four male blade terminals and a push-in housing with terminal designations 2, 4, 5 and 6; compare the original number, blade width, orientation, socket keying and circuit location
- Fitment: Designed specifically for all 1988-1998 Chevy & GMC full-size trucks and SUV's, performance Silverado C/K 1500 Tahoe Suburbans Sierra
- Function: Increase the intensity and improve the spread pattern by keeping all four lights on when in high beam mode. That is, in high beam mode, the low beam is also on. The tinned wire construction provides exceptional corrosion and oxidation...
- Note: Slight modifications may be necessary for some vehicles such as 1988-1991 Suburbans
- Includes: 40-amp heavy duty relay; relay base with wire harness; crimp terminals & mounting hardware
- SPEC & OE CROSS: 12V, 4 blade terminals; compact case ~1.9 × 1.4 × 0.7 in; OE reference 15016745. Cross-reference numbers for search: RY560 (Standard Motor Products), 1R1944 (Wells), 601-218 (Dorman). The later HDM service part used in recall repairs is...
- INSTALL & LOCATION: Installs in the under-hood fuse/relay center (headlamp driver/lighting relay position). Remove the old relay straight up, seat the new relay fully, then test low-beam/DRL. Typical issues addressed: intermittent or inoperative low-beam...
- COMPATIBLE WITH CHEVROLET: verify by VIN/OE# 15016745, COMPATIBLE WITH Trailblazer 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 (incl. EXT where equipped); SSR 2004; Express (6.6L diesel) 2009, 2010, 2011, 2012; Silverado 2010, 2011, 2012, 2013.
- COMPATIBLE WITH GMC (compatible with; verify by VIN/OE# 15016745): COMPATIBLE WITH Envoy 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009 (incl. XL 2003–2006, XUV 2004–2005); Savana (6.6L diesel) 2009, 2010, 2011, 2012; Sierra 2010, 2011, 2012, 2013.
- Compatible with Volkswagen Type 1 [ Beetle / Bug ] 1967-79,
- Compatible with Volkswagen Karmann Ghia 1967-74,
- Compatible with Volkswagen Type 2 [ Transporter / Bus ] 1967-79,
- Compatible with Volkswagen Type 3 [ Squareback, Fastback ] 1967-73
![[ALL STAR TRUCK PARTS] 2-Headlight H4 Headlamp Light Bulb Ceramic Socket Plugs Relay Wiring Harness Kit](https://m.media-amazon.com/images/I/41-L3wNDUkL._SL160_._SL160_.jpg "The Best Automotive Replacement Headlamp Relays 5")
- This Harness Fixes:
- Dim Headlights, Flickering Headlights, Back Feeding Power, Malfunctioning Headlights when using Hi/Low Beams
- Also fixes: Overloading the Headlight Switch, Overheating Plugs
- If you are upgrading to Halogen Bulbs or are having trouble with your 7"6", 4x6", 5-3/4" or any other H4 plug headlights not working properly, this is your fix!!
- Direct Replacement for Failed OEM Part 90080-87010
- NOT MADE IN CHINA - This product is manufactured in a Taiwan factory that prioritizes high quality standards and testing, fair worker salaries and safety, and environmental health standards.
- Buy With Confidence - Return this product within 30 days of purchase if it does not fit or is faulty. Please double check compatibility with your original part and vehicle!
- Specs & OE Cross-Refs — 12V, 4-pin automotive relay (brown body), direct replacement by part number; OE refs: 90987-02016, 90080-87024 (supersession), engineering ref 156700-1570. Verify by matching the number on your original relay before purchase for...
- Location & Function — Installs in the engine room fuse/relay box (junction block); used by different vehicles for headlamp or cooling-fan control (and similar high-load circuits). Check the relay map on the under-hood fuse box cover or service manual...
- Compatibility — Toyota (by year) — Compatible with Toyota Avalon 2000–2003, Camry 2002–2004, Celica 2000–2003, Corolla 2003–2005, Echo 2000–2003, Highlander 2003–2005, MR2 Spyder 2000–2003, Prius 2001–2003, RAV4 2001–2004, Sienna...
- Compatibility — Lexus (by year) — Compatible with Lexus ES300 2002–2003, ES330 2004, LS430 2001–2004 (used as a headlamp relay on these applications; verify by OE number and location in the engine room relay block).
- Multi-Vehicle Compatibility: This 15016745 multi-purpose relay is suitable for various vehicle models. Including Chevrolet Silverado 2500 (2011-2014), Buick LaCrosse (2005-2009), Cadillac Escalade (2011-2014), GMC, Isuzu, Pontiac and Oldsmobile.
- OEM Compatible: Relay 15016745 matches OEM part numbers 15016745, 1R1944, RY560, 601-218 and 13506836. Note: Make sure it is compatible with your vehicle's electrical system before purchasing.
- Main Application: Our 4-pin Headlight Relay is designed to fix headlight and fan clutch failures. Provides ground visibility for our nighttime travels. Also, relay 15016745 ensures that the vehicle's basic lighting system works properly, maintains a...
- Superior Performance: This 15016745 multi-purpose relay is made of durable plastic and high-quality copper. Plus, PMIC integrated circuits are also available internally. High temperature resistance, corrosion resistance, not easy to deform and excellent...
- Multi-Function Relay: Versatile electric relay designed for multiple vehicle systems, including fuel pump, horn, fog light, starter, headlamp, A/C compressor and more. A reliable replacement solution to help restore proper electrical function.
- OE Replacement Numbers: Reference OE numbers include 0987-02004,056700-5260, RY51,90987-02002,90080-87001,90080-87003 056700-4810 ,2-96132 PC643,4E-1103, S10037, 71-4660 ,213-422.
- Wide Compatibility: Designed as a replacement multi-purpose relay compatible with various vehicle applications. Please verify OE number and vehicle compatibility before purchase to ensure correct fit and performance.
- Durable & Reliable Performance: Built with quality materials for stable current transmission and dependable operation. Features up to 1,000,000 mechanical cycles and 100,000 electrical cycles for extended service life.
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Last update on 2026-10-17 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Automotive Replacement Headlamp Relays
Understanding Compatibility and Fitment
When selecting an automotive replacement headlamp relay, precise compatibility with your vehicle's make, model, and year is paramount. Relays, whether a standalone unit or part of a wiring harness, are not universally interchangeable. For instance, the Denso 567-0003 is specifically designed for Lexus/Toyota applications, ensuring an exact fit and electrical specification match. Similarly, the YLQASOON 601-218 lists specific part numbers (15016745) and a broad range of compatible vehicles, including Chevrolet, GMC, and Buick models. Users typically find that verifying the OEM part number on their existing relay against the replacement's specifications is the most reliable method to prevent fitment issues. A relay like the WMAutoPart 1R1489 emphasizes identical mounting and connectors to OE parts, which streamlines installation and ensures proper function.
Choosing Between a Standalone Relay and a Wiring Harness
The type of headlamp relay needed often depends on the specific problem you're trying to solve. A single replacement relay, such as the Denso 567-0003 or WMAutoPart 1R1489, is typically sufficient if the original relay has simply failed, resulting in intermittent or non-functional headlights. However, if you are experiencing issues like dim headlights, flickering, back-feeding power, or the overloading of your headlight switch, a full wiring harness kit is often the more effective solution. Products like the All Star Truck Parts 4-Headlight Relay Wiring Harness and the Octane Lighting 4-Headlight Relay Wiring Harness are designed to bypass the vehicle's original, often undersized, wiring, drawing power directly from the battery. This setup typically includes ceramic socket plugs, which can handle higher temperatures and prevent overheating issues common with plastic sockets, ultimately improving light output and system longevity.
Evaluating Durability and Performance Features
Beyond basic functionality, the durability and specific performance features of a headlamp relay can significantly impact its lifespan and reliability. Features like effective heat dissipation are critical for preventing premature failure. The WMAutoPart 1R1489, for example, highlights its ability to 'rapidly dissipate heat for cooler operating temperatures and longer part life,' which is a key indicator of robust design. Precise short-circuit protection is another vital feature, guarding your vehicle's electrical system against potential damage. While simpler relays might focus solely on switching power, more advanced options or harnesses, like those from All Star Truck Parts, are engineered to handle increased electrical loads, reducing strain on the vehicle's original circuits and improving overall headlight performance, particularly when upgrading to higher wattage bulbs.
Pros & Cons
Denso 567-0003 4-Prong Headlight Relay for Lexus/Toyota with Grey Color Code
Pros
- Manufactured by Denso, an OE supplier, implying high-quality and reliable performance.
- Designed for specific Lexus/Toyota models, ensuring a precise fit and electrical compatibility.
- Simple 4-prong design facilitates a straightforward, direct replacement procedure.
Cons
- Limited to specific vehicle compatibility, not a universal solution for various makes.
- As a single relay, it does not address issues stemming from insufficient wiring or overloaded switches.
[ALL STAR TRUCK PARTS] 4-Headlight Relay Wiring Harness H4 Headlamp Light Bulb Ceramic Socket Plugs Set
Pros
- Aims to fix multiple common headlight problems, including dimming, flickering, and switch overloading.
- Includes a full wiring harness and ceramic socket plugs, providing a comprehensive upgrade.
- Designed to improve overall headlight performance by ensuring consistent power delivery.
Cons
- Installation is typically more involved than a simple relay swap, requiring more electrical work.
- May be an excessive solution if the underlying issue is only a single faulty relay and not a wiring deficiency.
WMAutoPart Headlamp Relay 1R1489
Pros
- Engineered for rapid heat dissipation, contributing to cooler operation and extended part life.
- Features precise short-circuit protection, safeguarding the vehicle's electrical system.
- Mounting and connectors are identical to OE, simplifying installation for direct replacement.
Cons
- The product description does not detail specific vehicle compatibility, which requires additional research.
- Functions as a standard replacement relay and does not offer wiring upgrades for performance enhancement.
Common Mistakes to Avoid
Overlooking Vehicle-Specific Compatibility and Part Numbers
A common pitfall is assuming all 4-pin or 4-prong relays are interchangeable. Manufacturers often design relays with specific electrical characteristics and physical dimensions unique to certain vehicle models. For instance, the YLQASOON 4-Pin Headlamp/Multi-Purpose Relay 601-218 explicitly lists compatible part numbers like 15016745 and a range of Chevrolet, GMC, and Buick models. Similarly, the Denso 567-0003 is labeled for Lexus/Toyota with a specific grey color code. Failing to match these specifics can lead to improper fitment, electrical issues, or the relay simply not functioning.
Misdiagnosing the Root Cause of Headlight Problems
Users often replace a simple relay when the actual problem lies within the vehicle's wiring or overloaded circuits. The All Star Truck Parts 4-Headlight Relay Wiring Harness directly addresses issues like 'Dim Headlights, Flickering Headlights, Back Feeding Power, and Malfunctioning Headlights when using Hi/Low Beams.' A standalone relay, such as the WMAutoPart Headlamp Relay 1R1489, will not resolve these symptoms if they are caused by insufficient power delivery through the original wiring, which a harness is specifically designed to correct.
Ignoring the Importance of Heat Dissipation and Protection Features
Durability and longevity of a headlamp relay are significantly influenced by its ability to manage heat and protect against electrical faults. Overlooking relays with features like 'rapidly dissipates heat for cooler operating temperatures' and 'precise short-circuit protection,' as highlighted by the WMAutoPart Headlamp Relay 1R1489, can result in premature relay failure. Standard relays without these enhanced features might degrade faster, especially in demanding operating conditions or if the electrical load is close to their maximum rating.
