I would got to
http://www.itocuk.co.uk/forums/ they will know
Very similar cars are the Fronteras (based on the MU,same running gear as Isuzu,bar some engines) , so the early ones are to the right of the steering column, then if not there check behind, I think the passenger head light.
Or in the later model Frontera's its located in the central dash behind the coin holder.
Again thats where VX stuck it Isuzu may have been more practical
Check that site you will get a definitive answer