A CD can not be inserted Is another CD already inserted? Yes Normal No Check radio and cassette player. No Turn volume switch to max. OK When power switch is turned on, does sound "Pop" from speaker? Yes Radio faulty. No Is there battery voltage? Yes Amplifier faulty. No Is fuse all right? Blown Replace fuse. OK Is connector to player installed correctly? No Wiring harness faulty. Yes Can CD be inserted when EJECT button is pushed? Yes Normal No Turn ignition switch OFF, then turn it to ACC or ON. Does player operate when CD is inserted again? Yes Normal No Player faulty.