1a. If the compressor clutch fails to engage, first remove the corresponding relay and check its condition (see accompanying illustrations). Location of relay terminals (civic models).
1b. Location of relay terminals (integra models up to 1997.).
1c. Location of relay terminals (integra models since 1998.).
2. If the relay is OK, check for voltage between the terminals of its receiving socket and the ground, thereby checking the correctness of the power supply to the relay. If there is no voltage, then there is a break in the circuit, which must be detected and corrected.
3. After making sure that the power supply to the relay is working properly, install a jumper wire between terminals 1 and 3 (civic models), A and C (integra models up to 1997.) or 1 and 2 (Integra since 1998.) relay sockets - a distinct click should be heard, indicating that the compressor clutch has been activated.
4. If the clutch does not engage (no click), remove the jumper wire, disconnect the wiring from the coupling and check for continuity between the red wire of its connector and the compressor (see accompanying illustration). If necessary, eliminate the break. If there is conductivity, check the condition of the coupling.
5. Disconnect the low pressure switch and, with the ignition on, check for battery voltage between terminal 1 (Civic - blue/white wire terminal) or 2 (Integra - blue/red wire terminal) and ground. No voltage indicates a break. Otherwise, turn off the ignition and check for continuity between the terminals of the switch itself. If there is no continuity, check the switch and the pressure in the system.
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