Mitsubishi 3000GT Service Manual page 1061

BODY - Keyless Entry System
NOTE
If there are two transmitters, one registration procedure
is the same as the other one. In addition, the second
registration shall be done within a minute after the first
one was completed.
(6) After the second registration is completed, the door will
be locked and unlocked once.
(7) Registration mode finishes under the following conditions.
Registration of two transmitter codes are completed.
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One minute has passed since the registration mode
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setting.
Scan tool is disconnected. (ground released.)
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Any of the doors are opened.
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