• iWire Subaru Wiring Services

Plug Spotlight - Main Relay and Connector

Updated: Aug 9, 2019

What It Does: The Main Relay in your Subaru is triggered by the ECU to send power to the car. It sends power to turn on the ECU, injectors, coils, MAF, boost controller, etc. It's called the main relay because it basically powers all of the engine related functions.

Cars It Works On: All Subaru models built in 1991 to 2007 including WRX, STI, EJ Engines built in 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, and 2007.

How to Know if you Have an Issue: You can tell your main relay needs replacing if the ECU won't turn on but the fuse is good.

Where is it Located in my Subaru?:

1993-2001 models the main relay is located on the driver side wall under the dash (see above picture).

2002-2007 models the main relay is located on the passenger side by the door.


262 views0 comments
iWIre Logo with Wording 2 - USE.jpg




Mon - Fri: 9am - 5pm PST


iWire is here to simplify your Subaru powered project, big or small. Focus on the mechanical aspects and we'll take care of the wiring headaches for you.

Lake Forest, CA





© 2021 by iWire.

  • White Facebook Icon
  • White Instagram Icon
  • White YouTube Icon
  • White Google+ Icon
  • White Twitter Icon

iWire products are proudly Made in America.