Your car was probably an auto at one point
it will have a manual ecu now
The two buttons operate the electronically controlled transmission system. The buttons should be labelled PWR and MANU. Chances are that the vehicle was once an auto. You will probably find the ecu is an auto one unless they fitted a Glanza ecu during the conversion.
Jay
I have a 2 plug ECU on My forged ex auto GT
pre '92 gt's use a 2 plug ecu for both manual and auto. (same ecu)
a '94 gt has got a different ecu