You found this article because you are looking for a remote for this system, right? The next step is to determine if you should use the factory remote for your vehicle's year and model or some kind of aftermarket remote.
First locate the Factory Keyless Entry Verification Procedure for your vehicle. If the test result is positive then order your vehicle's factory keyless entry remote. If your result is negative then look for an aftermarket keyless entry system under your dash. Use it's brand and model number to locate the proper aftermarket remote.
Here is a link to the manual for KARR 4040a.