yung filipino driver (presumably a filipino citizen or permanent resident of the philippines) of the diplomat or foreign embassy is still liable. he can be charged in our local courts (ref: art 37, 1961 vienna convention on diplomatic relations)

only the members of the diplomatic corp are not liable for arrests (refs: art 29 & art 31, supra) or the premises of the diplomatic mission or means of transportation are even immune to searches (ref: art 22[3], supra).

just my contribution lang po, hehehehe :D