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On the table I have just such a module and the case looks like that the microcontroller sends pulses lasting 15ms with interruptions lasting ms. These pulses are on pin 27 power down of the TDA radio receiver system.
It looks like the radio system was started at short intervals in to minimize power consumption, although in the active state this current is still small 7mA.
The car owner provided me only the module without the key so I can not check much, it seems strange to connect the pin 27 tda to mcu, if it was to be in high condition all the time. In the module that fix the corroded only power cord tracks 12v , I sold them and gave the module to the owner. However, he came back to me and from what the module says the module still does not work. On pin 2 of the power socket I have 0V and the author of the post is 4. Is it a data output after processing of the pro cesora?
I would overtake this topic at such a stage until there will be a part for the replacement and the car. Only in the tests of any of the components we see a negative result. Nothing more. Secret knowledge Gentlemen. The constructor hid many puzzles in this model, the e60 repair is done efficiently when the diagnostician has not only an icoma but a bit of time has already devoted to ransomless upholstery
TDA5210, RF ресивер