Ecu Reset Procedure/Clearing Codes
To reset ECU, remove BACK UP fuse (CLOCK/RADIO fuse on Prelude) from underhood fuse/relay block. Leave fuse out for 10 seconds to reset ECU. This procedure cancels clock and radio settings, make note of settings before beginning reset procedure.
NOTE:
Some models have an anti-theft code built into the radio circuit. After ECU reset, the radio will not function until code is entered.