Originally Posted by Fenwick223

For everyone's convenience, here are the procedures from the Service Manual. I just got my second key and it worked perfectly after I did the following:

Keyless Entry Transmitter - Standard Procedure - Transmitter Programming.

The Remote Keyless Entry (RKE) Transmitter(s) can be programmed by the customer without special tools. Transmitter programming by the customer is done by performing the following steps:

1. Press either the lock or unlock button momentarily twice.

2. Turn the key in the ignition switch to the ON/RUN position within 30 seconds.

BTW, you can also test the key battery by pressing and holding both the lock and unlock buttons simultaneously for more than one second. The batteries are charged sufficiently if the LED next to the ignition key blade lights up briefly.