I have a 2013 2.4 Accord. AC compressor is not coming on. There is a 3 wire pressure test switch. The wires are blue, red and the third looks like brown. Maybe black. Which two wires do I cross to to override the low pressure switch? I'm thinking I have a freon link and the pressure is too low. Wanting to test if the compressor comes on when I override the low pressure switch.

 

I'm trying to find a good wiring diagram for the 2013 accord setup, but I'm not having any luck. A pressure sensor/switch with 3 wires almost means that it is either a pressure transducer, where a range of pressures can be sent to the PCM, or have a high and low pressure cut-off. I would avoid jumping that connector, because you can short power to the PCM and fry the PCM.

I'm pretty sure the parts stores have A/C manifolds as loaner tools. I'd recommend just hooking up the manifold to read the static pressure, then also read the high and low pressure with the engine running and a/c turned on. Do both fans on the radiator turn on when you turn on the a/c with the engine running?

 

I have an AC manifold myself here at the house. i cannot check the high and low pressure because the compressor is not cycling. I am guessing the pressure is too low and the low pressure switch is sensing this and deactivating the compressor. I cannot test the low/high pressure to confirm this though without overriding the low pressure switch.

I push on the schrader valve and there is pressure in the system. I' hoping the system is just low on freon and adding some will fix the no cooling issue.

I have a copy of the wiring diagram, but it is too large to attach.

 

What is the low pressure when the system is not running?

Do both fans turn on when you turn on the a/c with the engine running?

Do you have the 2013 shop manual? You may want to try the procedure to check HVAC codes without a scanner.

 

I’m trying to do this as well, except in my case the shop already confirmed a leak and I need the compressor to turn on so I can refill it with freon to get me by while saving up for the repair.

Using a test switch at the MG Clutch relay to jump the compressor didn’t work.