Volvo Workshop Manuals
XC90 2.5T AWD L5-2.5L Turbo VIN 59 B5254T2 (2003)
Powertrain Management > Relays and Modules - Powertrain Management > Relays and Modules - Computers and Control Systems > Engine Control Module > Component Information > Description and Operation > System Overview > Page 3986
The function of the main relay (system relay) is to supply certain components with voltage.
Air conditioning (A/C) relay
The air conditioning (A/C) relay supplies the A/C compressor with voltage. The relay is controlled by the engine control module (ECM) based on
the climate control module (CCM) (via the control area network (CAN))
the engine coolant temperature
the position of the accelerator pedal (AP)
the pressure in the system.
The Engine Control Module (ECM) can temporarily disengage the A/C compressor during wide open throttle (WOT) acceleration.
Fuel pump (FP) relay, (2002-2004)
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