I’ve had my SR22 for a little more than three months and have been flying quite a bit (130+ on the Hobbs). Most of my approach clearances have been “visual” and as result it’s been a while since I’ve needed to fly an ILS. Recently, during a vectored approach to final, I tried to couple the 55X to the ILS and was unable to intercept the glideslope. I’m not sure if I set everything up correctly. When I filed, I programmed the 430 from departure to destination. Once airborne I went to HDG/VS during the radar vector climb and, when able, I went to NAV GPSS/ALT to allow the 430 to fly the route at altitude. Approaching my destination I selected PROC, entered the approach (let’s say the ILS 18) and “loaded” waiting for my clearance. I then toggled the localizer frequency on both 430’s (verified the IDs) and waited for my clearance. When I was given radar vectors to the ILS 18 approach, I selected PROC and entered “Activate Approach to Vectors.” I then used HDG and VS/ALT as appropriate as I was vectored to the approach. As I intercepted the localizer both 430’s automatically went to VLOC. The aircraft continued to track the localizer, but I never got a GS indication and when the glideslope bar centered, the aircraft remained at the fixed altitude. I disconnected the 55X and hand flew the approach. I’ve gone over the 55X POH (page 37) which says “to arm the GS capture function…the autopilot must be in NAV/APR/ALT modes.” If I’m being vectored to final, using HDG/ALT, how do I get to this mode? Step by step help appreciated.