no you cannot unless there is a cut off switch installed by the manufacturer... you can turn it on or off using your ignition key i guess in your case toyota did not install one maybe because it is not yet mandatory there in the philippines but you can just ask toyota dealers about the option of putting one, one more thing dont mess up your supplemental restraint system air bag other than qualified service technician's...i have one installed in my tacoma here's the link www.pbase.com/image/15571292
peace out
cale