I have a cool start remote engine starter and keyless entry...I changed the battery in both remotes and they worked fine for about a month and then none of the buttons work except for the light when i push the side button...the doors don't lock or unlock, the trunk doesn't open, and the engine will not start.

SOURCE: Remote car door opener got wet and won't work

Well first open it up completly. Remove the battery. Get a hair dryer and dry it out completly. Then let it stand for several hours to cool down. Make sure that the contacts where the battery fits are clean of any rust, or corrosion. Now install a new battery. It should work.

Marvin

• 85242 Answers
• Posted on Sep 30, 2008

SOURCE: programing keyless entry

If you have an owners manual the programming instructions are in there. If no manual here they are:

1. Turn the ignition off.
2. Ground the receiver program terminal. Jump the two terminals located in the programing ground connector. (What this means in simple terms is locate the wires that run on the right side of the trunk. There is two black wires that has a plug on the end with two prongs. It is in between the antenna and tail lights.)
3. Within 2 seconds of connecting the prongs the door locks will lock. The unlock and the rear compartment lid release will produce a cycle, causing the horn to chirp. This indicates that the module is ready for reprogramming.
4. Press and hold the lock and unlock buttons at the same time until the doors lock and unlock. The rear compartment lid will release and the horn sounds to indicate that the transmitter has successfully been reprogrammed. (Hold buttons down for approximately 12 seconds)
5. Repeat the previous step for the remaining transmitters.
6. Remove the jumper at the program connector.
7. Verify the proper operation of each transmitter

SOURCE: 1995 jaguar xj6 dead battery and can't open trunk. please help,

you will need to use a jump box to put 12 volts to the engine compartment fuse box .Then you can
open trunk with key bob or button in car.

SOURCE: keyless entry wont work after battery died

stand at the vehicle and push and hold the lock and unlock buttons till the horn chirps to resync the key fob

SOURCE: lost keyless entry remote

turn door lock left twice to un do alarm ,on old cars it may or may not work due to old age