Hi, I have an 03 Ascent Corolla, just wanting to know whether you needed a relay at all, or just the fuse? I'm wanting to install fog lamps soon and am just wanting to know exactly what i need? Thanks in advance, Flugel. Hey there! You can check if your Corolla is pre-wired for fogs. Look underneath your front bumper and you should see the foglight connectors taped up if it is pre-wired. If it is, then all you would need is a 4-pin Micro Relay (Narva 68062BL). The 15A fuse for front fogs should already also be pre-installed. If you buy the ESUSE ZZE foglight kit, it comes with a micro relay. Let us know how it goes! - Kenneth