[mich427]

I think the trick is to fill all 4 memory slots when programming transmitters. Here are some instructions I downloaded for programming Code Alarm GOH-MM6-101890 transmitters.

Note: Each System module has four “slots”, or memory locations, to store transmitter codes, giving it the ability to operate from up to four transmitters. For proper operation, a transmitter code must be stored into each memory slot. When using less than four transmitters, follow the suggested programming parameters:

One Remote Transmitter – Program four (4) times
Two Remote Transmitters – Program each transmitter two (2) times
Three Remote Transmitters – Program two transmitters one (1) time,and the remaining transmitter twice.

1. Open the driver’s door. Drivers door MUST remain open and interior light on to enter into the programming mode.

2. Turn vehicle ignition on.

3. Press and hold emergency override button. After 10-15 seconds, the siren or horn will sound three (3) times.
This indicates that the unit has entered the transmitter programming mode.

Keep holding the button.

4. Press the ARM button on the remote transmitter to be programmed.
The siren or horn will sound once, indicating that the system has “learned” that remote transmitter.

5. Repeat step 5 for any additional transmitters.

6. Turn the vehicle ignition off and release the emergency override button to exit the programming mode.
Test all remote transmitters to ensure that they work properly by toggling the LOCK and UNLOCK buttons.

Hope this works for you.

Dave T.