This keyless remote programming instructions work for new 4B cars remote with part # 8S4Z-15K601-A, 8S4T-15K601-AA, 2S4T-15K601-AB, 2S4Z-15K601-AA, FCC id CWTWB1U345, CWTWB1U331 on the back of it.
1. Insert the keys in the ignition then twist it OFF to RUN 8 times within 10 seconds, ending in OFF position (this is to put the system in programming mode for your new remote). You will know your system has entered the programming mode once the door locks cycled (lock then unlock).
this step you should open the driver door and cycle the power door locks twice. This means you press LOCK, UNLOCK, LOCK, UNLOCK. Step ones says to turn from OFF to RUN up to eight times. If the locks cycle before eight times then move onto step 2 immediately. Do not continue cycling the ignition switch.)
(Note: When the first keyless entry remote transmitter is programmed, all existing keyless entry remote transmitters are erased.)
3. Repeat step 2 immediately for each transmitter that will operate the vehicle including your old ones (if any.)
5. To exit the system from programming mode just turn the key in the ignition to OFF position or wait up to 30 seconds after step 2.