You can't really disable the Brant.... You can switch off certain features and remove parts of the system.
Even if the keypad part of the system has been removed the rest of the system could:
A: still be fitted
B: still be causing your problem.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i