1a. If the compressor clutch fails, the first thing to do is to remove the corresponding relay and check its condition (see accompanying illustrations). Relay terminal arrangement (Civic models).
1b. Relay terminal arrangement (1997 Integra models).
1s. Relay terminal arrangement (Integra models since 1998).
2. If the relay is in order, make sure that there is voltage between the terminals of its receiving socket and ground, thereby checking the correctness of the power supply to the relay. If there is no voltage, then there is an open in the circuit, which should be detected and repaired.
3. After making sure that the power supply to the relay is working, install a jumper wire between terminals 1 and 3 (Civic models), A and C (1997 Integra models) or 1 and 2 (Integra since 1998 vol.) relay socket - a distinct click should be heard, indicating the operation of the compressor clutch.
4. If the clutch does not work (no click), remove the jumper wire, disconnect the wiring from the clutch and check for continuity between the red wire of its connector and the compressor (see accompanying illustration). Repair the break if necessary. If there is continuity, check the condition of the coupling.
5. Disconnect the low-pressure pressure switch K / V and, with the ignition on, make sure that there is battery voltage between terminal 1 (Civic - blue/white wire terminal), or 2 (Integra - blue-red wire terminal) and mass. The absence of voltage indicates the presence of a break. Otherwise, turn off the ignition and check for continuity between the terminals of the sensor-switch itself. If there is no continuity, check the switch and system pressure.