How do I replace the remote keyless entry transmitter battery?

ANSWER : The remote keyless entry (RKE) transmitter battery should last for at least three years. After three years, there’s a chance that it will die and need to be replaced. Replacing the RKE transmitter battery takes four steps.

Buy a replacement battery. The recommended replacement battery is a CR2032.
Open the transmitter. Do this by placing the RKE transmitter face down (so that the buttons are facing the ground), and using a flathead screwdriver to pry it open. You should notice a seam along the edge of the RKE transmitter; this is where the two halves connect, and where you should pry the case open from.
Replace the battery with your hands. Make sure that your hands are very clean and dry when you do this, or else you may damage the RKE transmitter.
Snap the two halves of the case back together.

Tip

If your RKE transmitter isn’t working, it may not be a battery issue. There may be interference with the remote signal. If you are near a radio tower or a cell phone tower, this is possibly the problem.

ANSWER : The remote keyless entry transmitter battery usually lasts for a few years. If the battery dies, you can easily replace it by following these steps:
1. Use a narrow tool to pry open the center cover of the transmitter.
2. Remove the old battery.
3. Insert a new CR2032 battery, positive side up.
4. Snap the cover back on.
*Tip
Make sure that your hands are clean and dry when replacing the battery, or you may cause damage to the battery or the key.

ANSWER : If the battery in your remote keyless entry (RKE) transmitter dies, then you will need to replace it. Usually you will be warned by a message from the Driver Information Center that reads “Replace Battery in Remote Key.” Replacing the RKE transmitter battery is very easy:

Extend the key on the RKE transmitter by pressing the button at the top of the transmitter.
Locate the battery cover on the back of the RKE transmitter, and pry it off with your fingers.
Press on the battery with your finger, and push it towards the key until the battery has been removed.
Insert a new CR2032 or equivalent battery into the battery case, with the positive side facing up. Press the battery down until it is firmly in place.
Put the battery cover back on until it snaps back into place.
The RKE transmitter battery has now been replaced.

Tip

Make sure that your fingers are very clean and very dry when replacing the RKE transmitter battery, or else you can cause damage to both the battery and the transmitter.

ANSWER : Programming a new remote keyless entry (RKE) transmitter is easy when you already have a recognized transmitter. Just follow these steps carefully:

Gather all of the transmitters – the new ones, and the already programmed one – so that they’re all together.
Locate the transmitter outlet on the center console. This is placed next to the power outlet, at the front of the console.
Remove the plastic trim from the transmitter outlet.
On the recognized transmitter, press the button at the top to extend the key. Place this key into the slot in the transmitter outlet.
Extend the key from one of the new RKE transmitters.
Insert the key of the new RKE transmitter into the driver’s side door lock, and turn the key to the unlock position five times in a span of 10 seconds. The Driver Information Center (DIC) should then display the words “ready for remote #2, 3, 4, or 5.“
Remove the recognized RKE transmitter from the transmitter outlet, and place the new transmitter key into the slot.
Press the ignition button. If the new transmitter has been programmed, then the DIC will alert you to begin programming the next RKE transmitter.
Remove the newly-programmed transmitter from the transmitter outlet, and press the unlock button on the transmitter.
Repeat steps 7-9 with the rest of the new RKE transmitters, until each transmitter has been programmed.
Press and hold the ignition button for 10 seconds, which will quit out of programming mode.
Return the plastic trim to the transmitter outlet area.
All of the RKE transmitters will now be programmed.

ANSWER : A working keyless entry remote is not only a convenience, but it can also help you find the vehicle in inclement weather or sound the alarm in an emergency. If the battery in the remote dies, replacing it is simple:

The remote is comprised of a front half and a rear half, the seam separating the two halves has a small notch in it where a small flat object can fit. Using this notch, the halves can be separated. A flat head screwdriver works well for this purpose.

Tip Twist with steady pressure but do not force the halves apart. Gently pry the halves and stop if there is serious resistance.

There is a small, round battery inside. Remove this battery and discard properly.
Replace the dead battery with a new CR2032 battery.
When the new battery is installed, line up the two halves and snap the remote back together.

ANSWER : If your vehicle has no remote keyless entry (RKE) transmitters that are currently programmed, then you will need to program all of your RKE transmitters. This process can take a while, but is easy to do if you follow these instructions:

Make sure that your vehicle is turned off, and that you have all of the transmitters that you will be programming.
Extend the key from one of the RKE transmitters by pressing the button at the top of the transmitter.
Insert the key into the door lock on the outside of the driver’s side door, and turn the key into the unlock position five times, within a span of 10 seconds. After doing this, the Driver Information Center (DIC) will display the words “Remote Learn Pending, Please Wait.”
After about 10 minutes, the DIC will switch to the words “press engine start button to learn.” Following this prompt, press the ignition button. The DIC will then return to the words REMOTE LEARN PENDING, PLEASE WAIT.
Repeat step 4 two times, so that the vehicle has cycled through the ignition stage three times. At this point, all previously programmed transmitters will no longer work. That way, if a transmitter has been lost or stolen, it cannot be used on your vehicle any more. The DIC should now display the words READY FOR REMOTE #1.
Locate the RKE transmitter outlet, which is on the center console, directly next to the power outlet. Remove the plastic trim from the transmitter outlet, revealing the transmitter slot.
Place the RKE transmitter key that had been used in the driver’s side door into the transmitter outlet slot.
Press the ignition button. This will program the RKE transmitter.
When the DIC displays that the transmitter has been programmed, remove the transmitter and press the unlock button on it.
Repeat steps 7-9 with the remaining transmitters that you wish to program.
Press and hold the ignition button for 10 seconds, which will quit out of programming mode.
Place the plastic trim back on the transmitter outlet slot.
All of the RKE transmitters are now programmed.

ANSWER : If you want a new remote keyless entry (RKE) transmitter, you will need to purchase one at a dealership. If the new RKE transmitter is replacing a lost transmitter, the entire RKE system will need to be reprogrammed for all of the transmitters.

ANSWER : As you may yourself have seen, there are many reports of this fault with the Civic, that is a battery or alternator is replaced only to have the warning light fail to extinguish despite checking every conceivable electrical possibility. Your only recourse is to have a certified mechanic go through that exercise with your car and that involves first attempting to "re-set" the light. If the warning light returns, the alternator output has to be carefully measured both loaded and unloaded. All terminal connections have to be verified including all grounds. Fuses have to be checked for integrity (continuity) and the possibility of shorts, in for example dash wiring, has to be checked. To request this repair, simply request an electrical components diagnostic and the responding certified mechanic will seek a resolution to this.