Subaru Impreza 2003 Service Manual page 177

18.Main Relay
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Remove the passenger's side front side sill cov-
er.
3) Remove the bolt which holds the main bracket
on body.
4) Disconnect the connectors from main relay.
B: INSTALLATION
Install in the reverse order of removal.
MAIN RELAY
FU-00009
FU-00317
FU(H4SO)-49
FUEL INJECTION (FUEL SYSTEMS)