As Klaus is saying, if the service guy puts in 2003 and goes down through the options, the Nav radio is not going to show up since the Nav was not an option in '03. Since '04 and '05 H2s did have Navs as options you can use those model years and the Nav will show up on the Tech2 as an option.
I believe you stated you have an '03 so it would probably be best for the service guy to "lie" to the tech2 and say it is an '04. The year or model of the radio does not matter as long as it is works with your setup (lux amp vs premium amp)
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