I'm trying to program my keyfob on 97 F150. The truck does not go into program mode. I cycle key on and off 8 times within 10 seconds but doors do not lock and unlock. Any suggestions?

 

First the 97 only needs to be cycled 5 times. Here is the procedure.

To program (or reprogram) the keyless entry remote transmitters into the RAP module, perform the following steps:

1. Make sure that the anti-theft system is not armed or triggered.

2. Turn the ignition switch from OFF to RUN five times within ten seconds, ending in RUN. If the RAP module has successfully entered program mode, it will lock and then unlock all doors.

3. Press any button on a keyless entry remote transmitter, and the doors will lock and then unlock to confirm that each keyless entry remote transmitter has been programmed.

4. If the door locks do not respond for any keyless entry remote transmitter, wait several seconds and press the button again. If the door locks still fail to respond, refer to Diagnosis and Testing in this section.

5. Turn the ignition switch to the OFF position, or wait up to five minutes after step 2, to exit program mode. If a keyless entry remote transmitter has been programmed (or reprogrammed), the RAP module will lock and unlock all doors one last time to confirm.

Now this is only if you have factory Keyless Entry. If you arent sure look under the driver side of the dash and you should see a yellowish tan module, called the RAP module. If that isnt present you dont have factory Keyless Enty. If you do, you may have a bad remote, or a bad battery in your remote. Or you may have a blown fuse somewhere. Worst case scenario, a bad RAP module.