Manual A/C Electronic Input Output Table; A/C Operation Description At Ecm - Suzuki 2006 SX4 Service Manual

Manual A/C Electronic Input Output Table

A/C refrigerant pressure sensor
A/C evaporator temperature sensor
ECT sensor
Wheel speed sensor (VSS)

A/C Operation Description at ECM

ECM controls the A/C compressor relay and condenser cooling fan relay according to signals from HVAC control unit,
A/C refrigerant pressure sensor, ECT sensor and evaporator temperature sensor. The A/C switch ON signal from
HVAC control unit is transmitted to ECM through BCM. For CAN communication system, refer to "CAN
Communication System Description in Section 1A".
ECM turns ON the A/C compressor relay when the vehicle state satisfy conditions described below.
• A/C switch ON signal is inputted from HVAC control unit
• A/C refrigerant pressure is within specified range
• Evaporator temperature is within specified range
• Engine speed is within specified range
• Engine coolant temperature is lower than specified value
• Throttle opening is lower than specified value
• Vehicle is not in either state of starting or quick acceleration
• ECT sensor malfunction is not detected
• A/C refrigerant pressure sensor malfunction is not detected
Condenser Cooling Fan Relay Control
ECM turn ON the condenser cooling fan relay at the same time when ECM turn ON the A/C compressor relay.
Condensor cooling fan relay
ECM
Compressor relay
*
ABS control module
Blower speed selector
*
BCM
*: CAN communication
Air Conditioning System: Manual Type 7B-3
HVAC control unit
Blower motor resistor
Air intake selector Air intake control actuator
A/C switch
S6RW0D7211002
Blower motor
I6RW0C721001-01
S6RW0D7211003