Sorry ja kann sein der 93 hat wohl schon ein neueres System als zuvor,
It is an IR (infrared) remote; it works like a TV remote - line of sight. It cannot be reprogrammed at the dealer, though it is the factory part. The microchip inside it puts out a series of pulses through the IR emitter. The exact sequence of pulses is determined by a number of input pins (12, I think) on the chip, which can be wired to one of three states - high, low, or float (no conection). That means there are a huge number of possible combinations. The receiver and transmitter use the same chip, and must be wired identically for the remote to work. Inside the remote and on the receiver circuit board you can find a little sticker with a 5-digit code. Only if the transmitter and receiver have the same code will the remote work the locks. Exactly how that code number is translated into the correct combination of highs, lows, and floats is not widely known.
ITEM WILL NOT WORK ON MODELS MANUFACTURED AFTER JULY 14, 1992.
Piland Electronics manufactures replacement remotes for Jeep Cherokee and Grand Cherokee using the factory compatible Infra Red Technology used in the earlier year models. The PL-1 remote requires a 5 Digit Code that must be retrieved from a paper sticker inside your old remote or off the back side of the receiver board in the overhead console. This 5 Digit code is like a KEY , it is required to match your good operating receiver.
Your 5 digit code is burned into a chip and placed inside the PL-1 transmitter and tested at the Piland factory. When you receive the unit it will be ready to go out of the box provided you have all other systems operating. (Receiver, wiring and door lock solenoids)
