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Heater Control unit testing

Jellybean

By Jellybean
in mkiv Technical

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Jellybean Apprentice

Jellybean

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Posted

Hi

 

Going to try and diagnose the issue ; any help appreciated , I have a few youtube videos to look at on how to verify transistors are working

 

So far

 

  • I need to test the car loom again as it has two 12V feeds not just one, Illumination and HVAC
  • Look for visibly cracked solder joints
  • The most likely ones are the transistors TR1 & TR2 and the Zener diode ZD1

 

Any other suggestions ? wheres Heckler when you need him :)

 

HVAC.jpg

Circuit-for-Power.jpg

AC-Circuit.jpg

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