I have added a Daytime Running Lights circuit on my Celica about five years ago. Item DRL-1 has a lifetime warrantee. By grounding an additional wire it cancels the DRL when using the turn signals. After six months it didn't work correctly so I sent it back for repair. Thus I suggest using a proper plug socket when installing this to the harness. http://www.webelectricproducts.com/products.htm rob