A CGA JET ON A VISUAL APCH TO VNY ARPT RWY 16R RECEIVED A TCASII RA ON UNKNOWN TFC BELOW AND INITIATED A CLB. TFC WAS NOT ISSUED BY THE CTLR.

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WORKING WITH SOCAL APCH INBOUND TO VNY AT XA30 IN VMC. CTLR ADVISED TO EXPECT THE ILS RWY 16R; AND PUT US ON VECTORS. APPROX 15 MI OUT ON A 120 DEG HDG; CTLR ADVISED THAT HE WOULD VECTOR ACFT THROUGH THE LOC. THE FIELD WAS SIGHTED VISUALLY AND APCH WAS NOTIFIED IN HOPE OF A VISUAL CLRNC. THE CTLR REPLIED THAT DUE TO TFC WE WOULD HAVE TO FLY THE ILS. AT THIS POINT; THE ACFT WAS APPROX 12 MI FROM TOUCHDOWN AT 7000 FT MSL (FIELD ELEVATION 799 FT). FLAPS AND GEAR WERE SELECTED IN ANTICIPATION OF A STEEP APCH. AT APPROX 10 MI FROM TOUCHDOWN; ATC CLRED US FOR THE VISUAL APCH AND ASKED IF WE WOULD BE ABLE TO MAKE THE RWY FROM THAT ALT. AFTER A BRIEF DISCUSSION WITH THE PNF; WE ADVISED THAT WE COULD SAFELY FLY THE VISUAL. AT APPROX 7 MI FROM TOUCHDOWN; ATC CANCELED LNDG CLRNC AND ISSUED AN IMMEDIATE L TURN TO 340 DEGS AND DSCNT TO 5000 FT MSL. PNF REQUESTED LOWER ALT AND WAS TOLD THAT 5000 FT WAS AS LOW AS HE COULD ISSUE. ONCE THE RWY WAS LOCATED AGAIN VISUALLY; ATC WAS NOTIFIED AND VISUAL APCH WAS REISSUED. SHORTLY AFTER; WHILE DSNDING THROUGH APPROX 4500 FT MSL ABOUT 6 MI FROM TOUCHDOWN; THE TCASII ISSUED A TA. IT SHOWED AN ACFT 700 FT BELOW US CLBING ABOUT 1 MI IN FRONT OF US. I BROKE MY DSCNT AND BOTH MYSELF AND THE PNF ATTEMPTED TO VISUALLY CONTACT THE TARGET; UNSUCCESSFULLY. AFTER ANOTHER 1/2 MI THE TCASII ISSUED AN RA AND A CLB COMMAND. A CLB WAS INITIATED AND A LATERAL DEV WAS COMMENCED TO THE E. PNF ADVISED ATC; WHO REPLIED; 'DO WHAT YOU HAVE TO DO.' TFC WAS NEVER SIGHTED. TCASII SHOWED US PASS 1/4 MI LATERALLY AND 300 FT ABOVE TARGET. ONCE CLR OF CONFLICT; A NON EVENTFUL LNDG WAS ACCOMPLISHED. ATC NEVER CALLED A TFC ALERT; AND OUR ONLY ADVISORY CAME FROM THE TCASII. FAULTY TCASII? POSSIBLY; BUT NOT PROBABLY. A SATURATED CTLR; WHO FLEW US THROUGH A LOC AND SET US UP FOR A 'SLAM DUNK' VISUAL APCH; SEEMS MORE LIKELY.