Why does my Honda Civic clutch not shut off?
It’s possible you could have a short to ground between the relay and ECM causing it to engage whenever the ignition switch is on. Clutch is controlled on the feed side by the relay, so it’s also possible to have a problem there, though less likely if you have replaced the relay. Could also be a problem with the ECM or inputs.
Why is the a / C switch on my Honda Civic not working?
Without knowing A/C system pressure this is a guess as to whether the switch is good or bad. As an alternative you can bypass the switch temporarily. The A/C pressure switch receives a signal from the Heater Control Panel (Connector A pin 4 @ heater control panel).
Where does the a / C signal come from on a Honda Civic?
And the Heater Control Panel receives a signal from the A/C on/off switch (Connector B pin 15 @ heater control panel, this looks like it should be 12v or 5v one of the two…). And it looks like the only other input into the Heater Control panel is from the Evaporator Temperature Sensor.
How can I tell if my AC relay has a problem?
AC compressor is not turning on. One of the most obvious signs that the AC relay may have a problem is that the compressor is not coming on at all. In most cases, when the AC is turned on you will be able to hear the compressor switch on.
Without knowing A/C system pressure this is a guess as to whether the switch is good or bad. As an alternative you can bypass the switch temporarily. The A/C pressure switch receives a signal from the Heater Control Panel (Connector A pin 4 @ heater control panel).
Why is my a / C relay not grounding?
The PCM does not commands the A/C relay for some reason, either the output is shut = new PCM or does not receive the command from the Climate control module (yeah I know you replaced the module). 2. The wire from pin 27 of the C1 connector on the PCM does not makes good contact on the PCM connector or on the relay stand (hope that is your problem).
And the Heater Control Panel receives a signal from the A/C on/off switch (Connector B pin 15 @ heater control panel, this looks like it should be 12v or 5v one of the two…). And it looks like the only other input into the Heater Control panel is from the Evaporator Temperature Sensor.
How is the a / C clutch connected to the ground?
When the command is received from the Climate Module, the pressure switches are OK and the engine is in a safe REV range the PCM makes a well informed decision to engage the A/C Clutch as long as is needed and safe. This is achieved by connecting the A/C output to the ground (Pin 27 on C1 connector).