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Home >> Volvo >> 2007 >> C70 Automatic >> Repair and Diagnosis (Single Page) >> Electrical >> Charging Systems >> Electronics - Design And Function - 2 Of 4 >> Engine Control Module (ECM) (B5244S4; 2006-2007) >> Function >> Regulating The Air Conditioning (A/C) Compressor
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Regulating The Air Conditioning (A/C) Compressor

Fig 1: Identifying Air Conditioning (A/C) Compressor
GLL141853Courtesy of VOLVO CARS CORPORATION

The air conditioning (A/C) compressor is controlled by the engine control module (ECM) (4/46) on request from the climate control module (CCM) (3/112) via the controller area network (CAN). When the engine control module (ECM) receives a signal from the climate control module (CCM) to activate the air conditioning (A/C) compressor, the engine control module (ECM) grounds the circuit for the relay coil for the A/C compressor. See also: AIR CONDITIONING (A/C) RELAY 

The relay (2/22) closes the circuit between the integrated relay/fuse box in the engine compartment and the clutch for the A/C compressor (8/3).

In addition to the information from the climate control module (CCM), the engine control module (ECM) checks the engagement and disengagement of the A/C compressor based on: