This is where we get into a big learning curve. OK, here goes...
There are two basic modes that a bypass module can run in. We will call them D2D and W2W. With D2D there are 3 different communication types that run on that 4 pin Data harness. Each bypass module has their own protocol. Directed has DBI D2D. iDatalink has theirs ( ADS ) and Fortin has theirs ( Flashlink ). The discussion on this can run a few hours. Some early bypass modules and R/S systems couldn't do 2-way communication but most current ones can. iDatalink still supports and lists 1-way but I don't think that happens very much. The ADS AL-CA bypass module can be flashed to support ADS or DBI D2D protocols while DEI units like the DBall3 can only do DBI D2D. Fortin's EVO-ALL can do all three protocols. We could go on...
Jumping to W2W. It's pretty straight forward. Each function that the bypass module performs has a gignal wire input to control it. So if the bypass module handles the Lock function, the R/S unit will control it with it's Lock output signal. That is what you did by going W2W and making all the necessary hardwired connections. In the Type 7 diagram you will see various wires in solid, dashed, Red or Black markings. A solid Red wire is considered 2-way when that signal is transmitted within the D2D harness but with W2W it is a signal supplied by the bypass module for use by the R/S unit. The Door Status is this type of signal and it's marked as an Input for the R/S and as an Output for the bypass module. Real easy to understand. If your R/S needs this signal you must hardwire it. Black solid wires must be hardwired in both W2W and D2D. Dashed Black wires are only run if not using D2D. In D2D modes they are handled by the 4 pin Data harness.
Being as I don't have the Prostart R/S model number or access to their install guides, I do not know what D2D protocol they use. It could be DBI or ADS or selectable. Don't know but with W2W it doesn't matter because you are not using the D2D harness for Data and not setting the ADS AL-CA for D2D communication. I don't know if your Prostart unit is an alarm system or just a R/S w/keyless entry. If it's an alarm system then you should make the Door, Trunk and Hood Status connectionms. If it's just a R/S, then only the Hood Status is necessary but going but the chart on Page 2, the bypass module is unable to supply the Hood Status on a Soul. That signal will have to be from the kit supplied and installed hood pin. As I mentioned earlier, there is a big learning curve here. But with W2W it is straight forward. You want the R/S Lock function? Run that wire between the R/S and the bypass module. You want Unlock? Run the wire. You want Trunk pop? Run the wire.
As mentioned, the Type 7 diagram is generic. It doesn't know what brand/model R/S you are using so some wires are not shown. You want the R/S to give horn confirmations, you must connect the R/S Horn output wire to the correct vehicle wire because the bypass module does not handle that function. Your R/S might not show a GWR output. GWR is what iDatalink calls that signal. Your R/S system might call that signal (-) Status Output or (-) 3rd Ignition. Either way, it's a necessary wire connection and must be made.
Soldering is fun!