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Q: Where is the location of the ECM, and how can I check it to see if its good? on 1999 Volkswagen Beetle

Is there a way I can check the ECM to see if it is working properly?
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Start car , test drive AND monitor MIL. Does check engine (MIL) come on at start-up and then go off within a few seconds or less? What symptoms does the car have?(besides that it's a volkswagen)
when you turn the key to start it, it does nothing, power door locks, courtesy lights, gas flap, truck will not work. it has not run for a month now the other day i hit the key and it started but nothing worked, I turned it off and its back to not starting again. I have checked all fuses, starter wires, changed the control module, it has a new battery. I don't know what to check now.
I'll stand behind my volkswagen remark , but be sure not to take it in a malicious way! You've got your work cut out for you if you want to tackle an electrical issue on a VW. With the additional AND very important info you gave , I have another question. Do you have a volt-ohmmeter and patience to check wiring with it? Starting from the battery lead to the fuse box check for proper connection, (no corrosion/loose pins) and power(should read within .2V (I'm being liberal) of battery voltage. If wiring diagrams are available to you , that would be a big plus. Don't overthink it. Stick to the basics of power and ground sources first. Some continuity tests may require really long jumper wires, and disconnect PCM while checking , so that while testing , no chance of power feedback through wrong circuit damages it. HOPEFULLY someone else will chime in and clear up any goofs or mis-statements I've made and hopefully this has been some help. Good luck. Hope you get it and hope it's not a nightmare!
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