...Am I right that the tone controls only work on positions 2 and 4 of the pickup switch? And in position 2, the bottom control affects the bridge pup, the top control affects the mid pup, in position 4, the bottom control affects the mid pup, the top control affects the neck pup?
Is that how it works?
The following is how most Strats are factory wired to work:
Master volume, of course.
The top tone control is wired to the neck pickup and is designed to work in positions 5 and 4 on your pickup selector switch which is, the neck and neck/middle pickups, respectively.
The lower tone control is AT LEAST wired to the middle pickup and is designed to work in positions 4, 3 and 2 of your pickup selector switch which is, the neck/middle, just middle, middle/bridge pickups, respectively.
Now, depending on which particular Strat model you have, the lower tone control MAY also be wired to the bridge pickup as well as the middle pickup. In this case, the lower tone control will ALSO work for the bridge pickup, position 1 of the pickup selector switch. Otherwise and again, depending on which particular model Strat you have, position 1 would have no tone control.
With the guitar in playing position, if you set the pickup selector switch all the way to your right (closest to the bridge), this is position 1 of the selector switch. Conversely, position 5 is if you were to set the switch to the extreme left.
If the neck pickup is teamed with the middle pickup, both tone controls will be activated.
If the middle pickup is teamed with the bridge pickup, the lower tone control will be activated.