Non-Scan Tool Method

To enter programming mode, disarm entry module. Ground pin C13 of entry module J3 connector (6 inch Green pigtail wire located at entry module).
Turn ignition switch to RUN position. Receiver acknowledges programming mode by flashing Vehicle Theft Security System LED located on top, center of instrument panel. See Fig 1 .
NOTE: Program mode will time out if no valid transmitter code is received within 60 seconds. The timer resets after each successful transmitter programming.
Send transmitter code by pressing either button on transmitter for approximately 10 seconds. A successful programming will be acknowledged with a horn chirp. Repeat for both transmitters. All transmitters MUST be reprogrammed anytime a new fob is added.

Fig 1: Vehicle Theft Security System LED

Courtesy of DAIMLERCHRYSLER CORPORATION