Both Keyfobs are original... Key Fob 1 recently stopped working. For a while the unlock button and trunk button continued to work but now they are done too. Key Fob 2 works perfectly fine. I would like to maintain two working KeyFobs. Do I need to get the the first reprogrammed or how do I fix it?

 

Sorry about the fobs.

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The link.

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From the 2G TL Service Manual:

Transmitter Programming

Storing transmitter codes:

The codes of up to three transmitters can be programed Into the keyless receiver unit memory. (If a fourth code
Is stored, the code which was Input first will be erased.)
NOTE: It Is Important to maintain the time limits between the steps. Make sure the door's, the hood, and
the trunk are closed.
1. Turn the Ignition switch ON (II),

2. Within 1 to 4 sec., push the transmitter lock or unlock button with the transmitter aimed at the
receiver In the passenger's multiplex control unit.

3. Within 1 to 4 sec., turn the Ignition switch OFF.

4. Within 1 to 4 sac., turn the Ignition switch ON (II).

5. Within 1 to 4 sec., push the transmitter lock or unlock button with the transmitter aimed at the
receiver In the passenger's multiplex control unit.

6. Within 1 to 4 sec., turn the Ignition switch OFF.

7. Within 4 sec., turn the Ignition switch ON (II).

8. Within 1 to 4 sec., push the transmitter lock or unlock button with the transmitter aimed at the
receiver In the passenger's multiplex control unit.

9. Within 1 to 4 sec., turn the Ignition switch OFF.

10. Within 4 sec., turn the Ignition switch ON (II).

11. Within 1 to 4 sec., push the transmitter lock or unlock button with the transmitter aimed at the
receiver In the passenger's multiplex control unit.

12. Confirm you can hear the sound of the door lock actuators. Within 1 to 4 sac., push the transmitter
lock or unlock button again. The keyless receiver's now in the programming mode. You must push
transmitter lock or unlock button of the first transmitter again program that transmitter.

13. Within 10 sec., aim the transmitters (up to three) whose codes you want to store at the receiver, and
press the transmitter lock or unlock buttons. Confirm that you can hear the sound of the door
lock actuators after each transmitter code Is stored.

14. Turn the Ignition switch OFF, and pull out the key.

15. Confirm proper operation with the new codes(s).

 

Where is the passenger's multiplex control unit that you are describing that I need to aim the fob at? Also, following these steps will reprogram the fob? I suspect that it lost the programming when I changed the battery.