My usual interpretation of damaging a vehicle was:
a) the power of the weapon is halved and the damage code down by one level (unless AV ammunition)
b) To obtain the target number for the body test of the vehicle one has to subtract the armor value form the already halved power of the weapon. If the armor value is similar or more than the halved weapon there is no body test because the weapon is just useless (this is different from normal metahuman combat where there is always, at least, a tn of 2).

NOW I have a doubt.
Re-reading SR3 page 132 I've noticed that it is said:
"...vehicle armor is hardened armor, meaning that it can deflect all damage from Weapons with a Power (modified by the Vehicle's body but not by burst or autofire) equal or less than the vehicle's body..."
What does it mean "modified by the vehicle's body" ????
From what I know Body usually modifies nothing but it is used to roll dices just to resist the damage!!!
Furthermore : THERE IS NO SENSE In doing AUtofire on a vehicle if it is not counted??????
What the hell I have to do?

Any canon explanation?

"Modified by the Vehicle's Body" means the halved power and the one level of Damage Level reduction. So if you shot an Ares Predator at a Car, it does 4L damage, and if that Car has 4 points of Vehicle Armor, it does no damage.

autofire is useful against vehicles if the base damage code of the weapon is enough to overcome the hardened armor. if one bullet can pierce a vehicle's armor, ten will do more damage.

OK, but How to treat autofire and burst fire VS a vehicle?
If I well understood, the bonuses to power & damage codes for auto/burst fires are added after the power has already been halved and has passed the armor rating (if it has passed) ??

So an example to explain my interpretation:

1) My UZI iii (6M damage) is usually burst fire so usually it goes to 9S.
2) No I want to fire my UZI III against a Lone Star Honda Turbo (armor 1).
3) The damage of the UZI III is diminshe, power halved and damage code scaled down, dso the damage goes from 6M is reduced to 3L.
4) 3L is more than vehicle's amor 1, so it can goes and hit the vehicle.
5) IN any case, like in any normal combat one has to do power - armor to determine the TN for the Body test. So 3-1=2, Damage staged to 2L.
5) Now, according to my interpretatiopn, I can add the burstfire bonus, that means that my final damage will be 5M and the final TN for the vehicle will be 5.
Am I right?
Is my interpretation canon-faithful?

edit: repeat everything in hahnsoo's post in this space.

So, Hahnsoo, you say to halve the power first to determine if one hits the target (and do not count the burst fire bonus) and then, if that number hits, starting again, counting the burst-fire bonus but halving the damage (andstaging by one the damage code) again?
I feel this interpretation to be more complicated......but I have the feeling also that the rulebook does not state clearly which is theright intepretation and both yours and mine should be right.....
(an example in a rulebook would be really appreciated......I hope there will be more examples in SR4, even if I will not buy it due to lack of money ).
In any case, Hansoo, can you quote any example in any SR book which clearly support your interpretation?