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Insert the key into the ignition and turn it to the “Run” position. Turn off power to the radio.
Step 2
Press the “Reset” button on the driver information center to clear any warning lights. Press the “Options” button until a blank message appears on the DIC screen.
Step 3
Press and hold “Reset” on the 3 seconds. Press the "Options" button until "Fob Training" is displayed on the DIC screen.
Step 4
Push the “Reset” button. This will bring up the message “HOLD LK + UNLK 1ST FOB” on the DIC screen.
Step 5
Hold down “Lock” and “Unlock” on the remote at the same time for 13 seconds.
Step 6
Watch the DIC, as it will read “Fob Learned” when the programming is accepted for that remote. Repeat "Step 8" to program a second Fob, if desired.
If that does not work, open up the fobs and check for cold/broken solder joints on the PCB
I just bought my first vet, a C5, 1999. Both of my remotes are not working and they have new batteries in the remotes, any suggestions on the cause?
This video I made shows the broken solder connection on my friend's C5 remote. I didn't repair it in this video but thought it might help you find the problem.