dei 555l not so idiot proof, won't rs

I am not familiar with the APS920 but if the Light Blue wire ( that is connected to the 555L Blue/Black wire) is

The Passlock 2 system usually controls the fuel supply so the engine should crank during a remote start attempt.

All connections should be soldered for optimum reliability.

I dont know how you could have had the reversed?  They both are ignitions and should both have power on and off them at the same time,  they're identical.

Just like your two accessorie outputs (org and brn) should be in that vehicle.

I had a 791 bypass module to bypass passlock II on a 2000 chevy impala just to test it, I had it for like 3 weeks and the security message was on the whole time I had this module, then I removed a 555l from a chevy van and installed it in the impala instead of the 791 and it worked . Just note the wiring info in the back of the module, now if you check the installation manual from xpresskit dot com it tells you exactly how to bypass passlock I and passlock II, the wiring is a little different because passlock I requires you to connect if I'm not wrong blck/wht wire to bulb check and purple to crank wire in vehicle but those two wires are not used for passlock II. Reliable and economic  module for GM vehicles with passlock I or passlock II even if your RS does not have a D2D port, I like it!

Sounds like you got it working, but I had a question.

You mentioned in your first post that ground is hooked up to black of ignition.

Are you sure that black wire is a ground?

Ground for both your Audiovox unit & the bypass should be to a good solid metal ground spot on the car underdash or in kick panel.