H INSPECTION OF LIGHT CONTROL RELAY CIRCUIT Turn ignition switch off. DIODE INSPECT DIODE CONTINUITY Is diode of headlight control relay side and/or taillight control relay side normal? (See page BE-14) No Replace diode. Yes COMPUTER Disconnect computer and inspect connector on wire harness side as follows. INSPECT HEADLIGHT CONTROL RELAY CIRCUIT Disconnect taillight control relay and theft deterrent horn. Is there battery voltage between terminal 12 and body ground? No Open or short circuit in wire harness between terminal 12 of computer and terminal 1 of headlight control relay. Yes INSPECT TAILLIGHT CONTROL RELAY CIRCUIT Disconnect headlight control relay and theft deterrent horn. Is there battery voltage between terminal 12 and body ground? No Open or short circuit in wire harness between terminal 12 of computer and terminal 1 of taillight control relay. Yes Replace computer.