Good afternoon, my name is Hernán, I am new to this forum, well I tell you, I have a car which has a factory with clarity with a cassette and CD charger, a few days ago I bought an mp3 module to adapt to the autoestereo, connect positive and negative to the board which delivers 9volts, also connect the audio cables to LR and GND, what happens is that when putting the system in cassette and having no cassette in the cassette player does not play the mp3, which would like to do is lie to the team, tell him that he has a cassette when he does not have anything, he also cut the positive and negative cables so that the motors of the cassette player will not work in vain, the cassette plate has several connections and I do not know which one use, down detail in order the connectors it has: 1. R-CH (use it for right-hand speaker output) 2. L-CH (use it for the left speaker output) 3. AG 4. DOBLY 5. T / R 6. F / R 7. MSG 8. APC 9. + 9V (use it for powering the mp3 module) 10. MTL 11. T-IN 12. MM 13. PM- 14. PM + 15. GND (use it for powering the mp3 module and the negative or audio mass) 16. REEL 17. BIT 2 18. BIT 1 19. BIT 3

I do not know what complicates life so much. being able to put a transmitter fm of the ashtray to the radius of the stereo,