The 2002 UP Mercedes ML W163 Auto AC not powering compressor

[@moeywill]

Also from research I have done when your auxiliary coolant pump is bad it can cause this circuit board to short out. Mine was not working. Which causes me to think it could be a problem in this circuit. I will test it tonight.

[@moeywill]

I should have added this to my initial comment. My 2002 ml320 ac compressor is not kicking on. Code comes up for B12/2 refigerant temperature/pressure switch. Im trying to figure out if i need a new switch or acc control panel. Live data says invalid celsius temperature reading at switch. 5 bars of pressure. Thank you.

[@ranat5526]

Good to know, thanks.

[@moeywill]

If those fuses are blown can I assume you will be able to see burn discoloration In that area of the board?

[@moeywill]

My 2002 ml320 ac compressor will not kick on. Code says B12/2 refrigerant temperature pressure switch. I am trying to figure out if it needs that switch or new control panel.

[@MMWA-DAVE]

@@moeywill in regards to the smd fuses, you cannot see visually when blown, you have to test with a multimeter. Your system may be low on gas if the pressure switch is being reported as an issue. From memory this was reporting a compressor issue.

[@moeywill]

Thanks for quick response. I think compressor is fine. System need to register at least 3 bars of pressure at switch to kick on. Mine is at 5 bar. It's either the switch or control panel.

[@moeywill]

Ok I am really sorry to bother you again. How exactly should I test those fuses with my multimeter. Can I just check them for continuity while they are in place?