Disabling Alarm Cut-out on a 4runner

We are on vacation and my brother-in-laws alarm in his 4runner will not disable. I think it is an aftermarket unit, the only markings on it are "FCC ID: J5523518T!" not sure on the "!" and "Made In The USA" the front has 2 buttons one larger and round the other smaller and oval and an LED.

I can cut the wire to the alarm horn to shut the thing up, but, I need to get by the starter cut-out to start the vehicle.

Can anyone tell me how to determine which wires I need to cut or short to get the vehicle started so that he can start the vehicle and get home?

The truck is a 1998, 4cyl/2wd if that is relevant.

SN95GT50

He had told me the remote battery was new, I opened the remote to see if I could find any identification for the alarm, noticed that the paint was rubbed off the battery. Replaced the battery and it worked fine, argghhh.

Thanks,
SN95GT50

Good job

ahhhh i need help to my dads ****n alarm wont shut up how can i disable it

ahhhh i need help to my dads ****n alarm wont shut up how can i disable it
OEM alarm?