This is from Acura TSB 97-040. I know this works for all the RLs up to 2004, and I believe it works for the later ones as well.
Programming the Transmitter
• The system accepts up to three transmitters. The transmitter codes are stored in a stacking-type memory. If a fourth transmitter code is programmed, the code for the first transmitter will be erased.
• Entering the programming mode cancels all learned transmitter codes, so none of the previously programmed transmitters will work. You must reprogram all of the transmitters once you are in the programming mode.
• You must complete steps 1-6 within 4 seconds of the previous step to keep the system from exiting the programming mode.
1. Turn the ignition switch to ON (II).
2. Press the “Lock” or “Unlock” button on one of the transmitters. (An unprogrammed transmitter can be used for this step.)
3. Turn the ignition switch to LOCK (0).
4. Repeat steps 1, 2, and 3 two more times. Use the same transmitter used in step 2.
5. Turn the ignition switch to ON (II).
6. Press the “Lock” or “Unlock” button on the same transmitter. Make sure the power door locks cycle to confirm that the system is in programming mode.
7. Within 10 seconds, press the “Lock” or “Unlock” button on each transmitter, including the one used to enter the programming mode. Make sure the power door locks cycle after you press each transmitter button to confirm that the system accepted the transmitter’s code.
8. Turn the ignition switch to LOCK (0) to exit the programming mode.
Turning the Audible Chirp On/Off
To turn the audible chirp off and on, press and hold the “Trunk Release” button, then immediately press and hold the “Lock” button. The LED on the transmitter blinks once to indicate on or twice to indicate off.
Ordering a Transmitter
Transmitters can be ordered only by authorized Honda dealers. Order them from American Honda using normal parts ordering procedures.
Batteries for the Transmitter
The battery number is CR2025. Each transmitter uses one battery.
Linear Mode
