The engine control module is required for the engine to operate and can not be bypassed.
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when you open the hood of your 1991 Jeep cherokee, look at the right side fender( drivers side) you will see a black box mounted to the fender well behing and next to the air box,. that is the Electronic Control Module ( ECM). I hope this helps.
1987 and up will be interchangeable, although there might be some reflashing of the ECM required.
Boss uses buffered bypass, not true bypass.
If the compressor is locing up I belive you have two choices (1) look on the belt routing digram under the hood I belive it shows belt routing without ac unit, I think you can buy a belt for a non ac jeep & just route the belt to bypass the ac unit-you will have to try it! (2) in the power box you could remove the ac relay to stop cycling of the compressor. as long as the clutch free wheels this will work, I have done this myself without short term issue.