It's not "off" it's just not doing an automatic sweep. Whenever you go to the radar room, it turns off the auto sweep for some reason. You have to manually turn it back on, and then it'll stay on until you go to the radar room again.
BTW, if you're using an older version of SH4, the surface search radar would not turn back on automatically if you submerged and then resurfaced. You would have to turn it on each time manually. But in either patch 1.4 or 1.5 they fixed it so it would come back on by itself when surfacing, even if you turn it off yourself before submerging.
As for Japanese detection equipment, they do get it sometime in 1944.
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Frederick J. Barnett
Someone's got to take the responsibility if the job's going to get done! Do you think that's easy?! - Gregory Peck, The Guns of Navarone.
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