Toyota used two different remotes with FCC ID BAB237131-022 with port-installed or dealer-installed systems in the late 1990s and early in this millennium. These remotes looked similar. One had a black case and the other a dark grey case. The easiest way to tell which of these you have is to compare the color of the buttons with the color of the case. Both remotes have black buttons. So, for the remote with the black case, the buttons and case are the same color. For the remote with the dark grey case, the case is just slightly lighter than the buttons.
Toyota makes replacement remotes for both of these transmitters. They look different from the original remotes, but once again, look very similar to each other. The original remotes and replacement keyfob for each are shown below.
Black-cased Toyota remote with FCC ID BAB237131-022: http://www.remotesunlimited.com/catalog/product_info.php?products_id=223
Grey-cased Toyota remote with FCC ID BAB237131-022: http://www.remotesunlimited.com/catalog/product_info.php?products_id=224
Both remotes are user programmable and come with instructions and free phone tech support.