Things You'll Need
Instructions
Through Your Cassette Deck
Connect the headphone plug on the cassette adapter to the heaphone jack on your PSP.
Insert the cassette end of the cassette adapter into your car's cassette deck. Typically instructions are printed on the adapter explaining the proper way to insert the cassette into your player.
Power on your PSP as normal. Any audio running from your PSP will now play through your car speakers. Adjust the volume on both your PSP and car stereo to match your preferences.
Through Your FM Radio
Connect the headphone plug of the FM radio adapter to your PSP's headphone jack.
Power on the adapter and set the radio frequency
Set your car's radio to match the station of the FM adapter.
Power on your PSP as normal. Any audio running from your PSP will now play through your car speakers. Adjust the volume on both your PSP and car stereo to match your preferences.