DTC P0646 A/C Clutch Relay Control Circuit Low: General Description

A/C compressor raises pressure to condense the evaporated refrigerant at evaporator in A/C system more easily. Without A/C signal, A/C compressor does not operate but with ON signal, PCM activates A/C compressor relay. With the relay activation, A/C compressor turns on using the power of the engine.