Thank You for support !
I say in post #23 : with PWM work great ! I try with 16F628A and it's ok ( this PIC work in both variants -by wire and by infrared) ! I drive IR-LED through NPN transistor and the range is fine (It's necessarily only 30-40 cm !)
I say in post #37 : without PWM ( using assembly), I have good results with 12F675. Only problem is "detecting" the correct timming, because of inaccurate intr_osc. Maybe with external cristall the things are changed, but losing 2 pins...
Finally I decided to use by-wire remote (for 5 commands ), with 2 wires (to ADC-in of PIC and Ground) between steering wheel and RC Blaupunkt (see picture)...like in original schematic "interfacting a Lacetti to a Blaupunkt".
Anyway nice project !
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