Power Source Circuit
Turn ignition on. Check "GAUGE" fuse ("ECU-IG" on Camry, Celica, Cressida, Supra, Tercel and Van, "WIPER" on Pickup and 4Runner, and "TURN GAUGE" on MR2). If fuse is blown, replace fuse and recheck system. If fuse blows again, check for short circuit between fuse and terminal No. 2 of main switch (terminal 16 of computer connector terminal on MR2). See Fig 1. Also inspect main switch.