Product review (5 stars): A few valuable insights beyond a product evaluation
Prior to purchasing, initial research pointed to a replacement OEM or equivalent to Whirpool part# 2198597.  The least expensive aftermarket unit on Amazon that cross referenced to #2198597 was the Supco RIM597.  Seemed straight forward enough and I was about to purchase when I noticed that, at the time of order, the RIM597 wasn't offered as Amazon Same Day Prime shipping, rather it was 3rd party shipped.
Given the specific scheduling circumstance I was under a time crunch to get this done and couldn't wait the extra 5-7 days ship time.

So, I noticed that the Supco RIM900 was offered as Prime Same Day and appeared identical to the RIM597.  So I reached out to the mfg; reviewed the respective model's spec PDFs; as well as received direct emailed responses from Supco's tech support.  Additionally two respondents to my Amazon Q/A (one of which appeared to be from an experienced seller).  All of the feedback and data confirmed they they are identical units despite the marketing materials which would lead one to believe otherwise.  The only difference: RIM900 does NOTE include a new wiring harness.

So you would 1)Use your existing harness or  2)Use a separately purchased new harness--note, a new harness alone cost upwards of $25 - $30 (..ya, it's silly)
Is there an issue with using your existing harness? No, unless the inline thermal fuse of the existing harness is the root culprit of your non-functioning ice maker...and based on my queries, this is not common).

In my case the RIM900 along with my existing harness took <8 minutes from start to finish; and the pleasing sounds of ice dropping began within about 3 hours.

Simple recommendation: If your replacement calls for a RIM597 and you don't mind that it's not listed as Prime (again, at the time that I write this review, it was not, but it may be now...), you should order the RIM597.
Why?  because the price difference between the RIM597 and the RIM900 is negligible ($1.71 more for the RIM597); and since the RIM597 includes a new wire harness (which you likely won't need) and in the off-chance that the existing harness is the culprit, it's worth the extra $1.71 to have it just in case.

Also, there is a lot of misinformation around what is included and what isn't for the RIM900.
In the Q/A several people indicated that a "new wiring harness is included".  This is incorrect.  It's possible that the mfg simply isn't consistent in what they pack, but according to Supco's tech support, the RIM900 NEVER included a harness.  So, again, the one I received came with only a replacement metal swing arm (note, if your fridge uses an elec. eye, you will not use this BUT YOU MUST REMEMBER TO ENSURE THAT THE SWING ARM SWITCH POSITION IN THE THE "ON" SETTING WHICH IS IN THE 'DOWN' ORIENTATION).

Hope this helps.