The Remote Keyless Entry (RKE) Transmitter can be programmed using the DRB III scan tool or by the customer. To program the transmitter with the DRB III scan tool, follow the appropriate Body Diagnostic Procedures. For customer programming, at least one RKE transmitter must already be programmed to add additional transmitters; if all transmitters are lost, the DRB III scan tool is required to program new transmitters. The customer programming process involves pressing the unlock button on a programmed fob for a minimum of 4 seconds to a maximum of 10 seconds with the ignition switch ON, followed by pressing the panic button within the 4 to 0 second range. After releasing both buttons, the BCM will chime, and then any button on each fob to be programmed should be pressed, with the BCM chiming as each fob is learned. To exit program mode, turn OFF the ignition or wait 32 seconds, after which the BCM will chime again.