When I jumped my batterie i accidently reversed the negative and posotive after, the radio stopped working I checked fuse, fuse was ok what do i check now

reversing cables blows out electronics.
only hope is fuse blow.
beyond that expensive repair.
learn use jumper cables properly or go broke fast.

no car told at all maker model nor year. ouch 100 years of cars. wow.
all that is wrong,
battery rules
key off. and in pocket or work bench set. near have 2 keys near ignition
battery rules are neg off first ,POS off last.
and POS on first and neg last (the reverse going back in)
if only working on car the rule is battery lug neg off only.
never reverse battery cables, ever, or smoke out. or jumper backwards. BOOM even both cars jumped BOOM . learn this now.

never let lugs hit the body of car or ever.
the silly panic stuff you read (small wires) stuff?? yeah well know.
is, battery disconnect the radio goes dead lacking its code easy to get. or all computers on board go to learn mode, well let it .
lost radio stations memory , no crying towel there (DIY)
ever mess with ALTERNATOR lugs. pull BAT main NEG first or blow up the alternators huge 100amp fuse.
you need to learn electrics first. or blow things up just working say engine problems, do all ASE electric classes first, take notes.

learn not to blow up $3000 computers in the car , now to chip shortages (china chip bull)
and now 2times overpriced. OUCH, learn it now.
how to do it right. (and what happens done wrong, matters too)
you let the smoke out, for sure .

It isn't normally as easy as changing a fuse. Fuses only blow when power is diverted to ground. Connecting a battery in reverse polarity causes damage to modules and sensors which require replacement. The Toyota 'Chaser' is an unknown model to us here in North America, so this search query may work better for you. Please add the year to my query before the work 'Toyota'. You will almost certainly need a good auto-electrician to diagnose the module that has failed, probably BCM.

https://www.google.com/search?q=Toyota+chaser+fuse+box+diagram

and a bit of information regarding reverse polarity.

https://www.google.com/search?q=connecting+a+car+battery+reverse+polarity+damage

..

check the negative wire from the battery to the body (not good ground ) clean

OLder cars YEs you can jump it without a battery. But in newer cars that use computers and advanced Eltronic ignition/timing/ful injection you have to have power to the cars computer. without a good battery the car will not run.---------------------------------------------------------------------------------
Renault CAN Clip

is it only the radio that dosent work there may be another fuse on the wire of the radio

Check your fuses to your radio... the reversed polarity may have been blown... Alot of aftermarket stereos have a fuse in the line to the power of the radio ..be sure to look there too.

Possible battery drain.
Remove the negative battery cable from its post and connect an ammeter red probe
to the negative battery post and the black probe to the negative battery cable.
Now start pulling fuses until the voltage on the meter returns to normal.
(anything above a half of a volt is too high) The fuse you pulled to get this
result is the affected circuit. Now you have to probe it from its B+ source to
the load
to find the short. Check all connectors for rust and the line for opens or
shorting to ground. Repair accordingly.

No not usually. It's high current flow that blows fuses and unless you put more than 12-14 volts onto the battery no harm could be done. However if you accidently reversed the polarity (put the cables on back to front) then you would cause damage to the alternator diodes and the battery would drain back though them. If the radio was switched on at time of jumping, it would be damaged.

Really shouldn't be bad, you will have to get underneath the vehicle, but once you're there, its basically disconnecting the posotive and negative wires, and 2 to 3 bolts holding it in the motor, after that, its just the reverse procedure for installation, make sure you disconnect the battery before hand, the 12v can give you a good wake up call. Hope that helps