CR-V LX 4WD L4-1972cc 2.0L DOHC MFI (2000)
Refrigerant Pressure Sensor / Switch: Description and Operation
With the ignition switch in ON (II), the heater control panel receives battery voltage through the BLK/YEL wire at cavity 1. The heater control panel is
grounded by a BLK wire at G401.
When you push the A/C ON/OFF button with the ignition switch in ON (II), the heater control panel will ground the A/C ON input at cavity 5 ('97
model) or 27 ('98-'99 models) of the powertrain or engine control module (PCM or ECM) through the A/C pressure switch.
The PCM or ECM grounds the A/C compressor clutch relay when the ignition switch is in ON (II). The clutch relay then energizes the compressor
clutch, which engages and begins turning the compressor.
A/C Pressure Switch
The A/C pressure switch is located in the condenser outlet line where refrigerant is in a high temperature/high pressure liquid state. The switch will sense
abnormally high or low pressure, and open the circuit. This removes ground, and the compressor will stop running.
