MLG ACFT COMMENCING APCH. RPTR CAPT COULDN'T GET AUTOPLT TO INTERCEPT ILS; THEN HAND FLEW ACFT BUT THE FLT DIRECTOR BARS WERE NOT PROVIDING ACCURATE INFO. FINALLY RPTR DISCOVERED THAT THE COURSE BAR WAS NOT SET FOR THE INBOUND COURSE. FO HAD NOTICED THE COURSE SET; BUT DIDN'T QUESTION THE CAPT THINKING HE HAD IT SET FOR A REASON. ACFT PROBABLY DEVIATED FROM COURSE ON PARALLEL APCHS.

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PROB AROSE WHEN INTERCEPTING LOC LEVEL AT 5000 FT AND CLRED FOR APCH. AUTOPLT WAS ENGAGED AND APCH MODE SELECTED. WE CROSSED THROUGH LOC WITHOUT CAPTURING IT. I TURNED ACFT IN CTL WHEEL STEERING MODE TO RE-INTERCEPT -- IT DIDN'T. I TURNED OFF AUTOPLT TO HAND-FLY APCH AND FOLLOW FLT DIRECTOR BARS AND IT AGAIN WENT THROUGH LOC. I TURNED MY EHSI; ELECTRONIC HORIZ SIT INDICATOR; TO LOC MODE FROM MISSED APCH MODE AND DISCOVERED THE COURSE BAR WAS NOT TURNED TO THE PROPER INBOUND COURSE. SET CORRECT INBOUND HEADING IN AND IT WORKED FINE. IN SETTING UP FOR APCH THE SETTING OF THE COURSE WAS NOT ACCOMPLISHED. WHEN THE FO DID THE CHKLIST; HE SAID HE SAW IT WASN'T SET PROPERLY BUT DIDN'T SAY ANYTHING BECAUSE HE THOUGHT I WAS USING IT FOR SOMETHING ELSE. HOW FAR WE DEVIATED OFF COURSE I'M NOT SURE; BUT PARALLEL APCHS WERE IN EFFECT AND WE PROBABLY GOT CLOSE TO THE OTHER LOC. WE WERE AT DIFFERENT ALTS FROM THE OTHER ACFT. ATC DID NOT QUESTION US. FO WAS ALSO GETTING CONFUSED ON WHEN TO SWITCH TO THE TWR FREQ FROM APCH CTL. THEY DO IT EARLY AT ORD WHEN PARALLEL APCHS ARE IN USE. I LEARNED ONCE AGAIN TO DOUBLE CHK EVERYTHING.