Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
good morning my name is ***** ***** I will assist
I attached a wiring diagram of the ac system for you to view. the pcm will ground the relay to activate depending on inputs from the high pressure and low pressure switches. check the voltages at each first and make sure you have both powers at the relay.
that is the only listing for the diagram that I have.
is there a switch on the dryer???
ok, I will opt out for someone else that may have a better or other diagram for you
sorry I could not be more help
new expert here are these the 3 wires for the pressure sensor wiring diagram you need ?
there should only be 1 - 3 wire ac switch/sensor for this system
one ECM connector is blue colored and the other is black colored
you want connector C1 terminal # ***** the wire color is red/black
and you want the BLUE colored ECM connector
49 is the output from the sensor to the computer on the blue connector
36 is the AC request signal
yes when it is off it will still send a signal back as there is pressure in that ac system which i hope is filled to exact R134 spec amount of R134
either the sensor is wrong or the red/black wire from the ac switch to the computer is bad the system is not charged correctly or the computer is bad
as long as on the ECM connector C2 terminal # ***** a dark green /white wire does NOT show a ground when the ac is turned on with the engine running
ok the ground that is supposed to turn on and off on terminal 55 is when the computer wants to turn on the ac and that wire is the ground for the ac relay to turn on the relay if no ground when the trucks on and ac on then our issue is not the correct R134 in the system or a bad switch or the computer is bad
you have the ac request and the 5 volts and ground at the switch
kind of narrows this issue right down to those things i said being the problem
it should show 1.5 to maybe 2 volts
if you unplug it will the ac turn on if not if you jump the 5 volts to the signal wire at the connector will it turn on ?
how are you making out ?
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at this point i think we need to see if we can get a second opinion
hang on another expert will rely back to you