Save yourself a boat load of trouble and just buy the actual OEM remote from Merlin or IsuzuParts.com instead of those aftermarket joints. I bought my extra/replacement remote about 6 months ago for something like $35 and had it in hand 3-4 days after I placed the order. It takes about 5 minutes to program and you don't really need instructions, just use an ink pen to push-and-hold the green button on the alarm box under the driver's side dash, then keep clicking the remote until it works.

Problem solved.