Honda prelude 93 auto transmission: "s" light flashes

3s, humm...... what is that, google shows ZERO for that.
can i know what object shows that? dash, ECU, trans shift.? what?
where are your eyes looking,?
is this the ECU flash code>? LED? at ECU?

"1985-91 Prelude models, there is only one LED display."
ECU code 3 is bad MAP (or bad vacuum to it)

Carb engine or EFI engine./ and which engine?> "options"

here is the FSM , look it up , gen 2 to 5
http://hondatech.info/downloads/Auto/Manuals/Prelude/

read operators guide, it says, transmission errors.
slipping, is bad, if slipping the trans clutches or bands will burn up.
it dont flash for funs and giggles. RTM

Just disconnect the negative battery cable for 5 Min's

what oil is required for a 1993 honda prelude

you have a problem with the linear solenoid on the trans. it needs to diagd properly to c if its broke, or shorted wire, or disconnected

the trans will actually bolt up to the engine..but it will not work properly without the pressure switch plugged in to the harness... if u notice, there is a hole with no threads in the prelude trans..u couldnt even thread a 3rd gear pressure switch in the trans case..trust me ive seen it b4 at the dealer where i work.. i even went as far as installing the trans and when going back together, saw the difference when trying to plug the harness in...its not the same..i laugh about it now, but was very mad at myself at the time for assumeing the parts guy brought me the right part..the guy with the prelude was about to install my accord  trans in his prelude ...luckily i was able to stop him b4 he installed my trans in his prelude...i laugh about it now

check for a blown ignition fuse in the fusebox. more info would help....Do the dash lights come on in the KEY-ON position?
Will it crank over? while its cranking is the engine light on?

shift solenoids are going bad there are 4 solenoids. they are on top front of transmission and are small round with wires connected. they are in pairs of two.1,2 and 3,4 they control shifting. usually light flashes and the transmission goes into a neutral sounding state when not accelerating

run it on d4

my 93 prelude was doing the exact same thing and for me it was my alternator was working properly.
go to a parts store and have them test it.