Frelander 2. Manual - part 414
automatic control.
Air distribution can be returned to automatic control by pressing the 'AUTO' switch located in the center of the blower motor
rotary controller. This will illuminate the 'AUTO' LED and allow the ATC module to control air distribution in line with its
'comfort' algorithm
Air distribution is controlled by 2 air distribution doors. The ATC module controls the position of the air distribution doors by
providing LIN bus messages to the door stepper motors. Hall effect sensors located within the stepper motors inform the ATC
module that movement of the stepper motors is taking place.
ECON - Single Zone Manual System
Pressing the 'ECON' momentary switch on the control panel will switch off the A/C system. When selected, the ATC module
will transmit a message over the high speed CAN bus to the ECM requesting the A/C compressor is disabled. The ECM
disables the compressor by de-energizing the A/C compressor control relay located in the BJB. The tell-tale LED in the switch
will illuminate to alert the vehicle occupants that the system is in 'ECON' mode.
W hen 'ECON' mode is selected, temperature control is still available but no cooling of intake air will take place. The minimum
output air temperature from the system will be ambient air temperature plus any heat pick up in the air intake path.
A/C can be switched back on by pressing the 'ECON' switch a second time. This will also extinguish the 'ECON' LED.
Stop/Start Vehicles - From 2010 MY
From 2010 MY, the 'ECON' switch will be labeled ‘A/C’ to prevent confusion with the ‘Eco’ switch which operates the
‘Stop/Start’ and 'Gear Change Indicator' systems.
For additional information, refer to:
Starting System
(303-06C Starting System - TD4 2.2L Diesel, Vehicles Built From:
01-03-2009, Description and Operation).
ECON - Dual Zone Automatic System
Pressing the 'ECON/OFF' momentary switch in the control panel will switch off the A/C system. When selected, the ATC
module will transmit a message over the high speed CAN bus to the ECM requesting the A/C compressor is disabled. The ECM
disables the compressor by de-energizing the A/C compressor control relay located in the BJB. The 'ECON' tell-tale LED in the
switch will illuminate to alert the vehicle occupants that the system is in 'ECON' mode.
W hen 'ECON' mode is selected, temperature control is still available but no cooling of intake air will take place. The minimum
output air temperature from the system will be ambient air temperature plus any heat pick up in the air intake path.
A second press of the 'ECON/OFF' switch will extinguish the 'ECON' LED and illuminate the 'OFF' LED. W hen in 'OFF' mode the
ATC module sets the blower motor speed to 0. Air distribution into the cabin will remain as previously selected. All LED's on
the control panel will be extinguished, although night time illumination will remain active.
• NOTE: When in 'OFF' mode, the heated seat, heated windshield and heated rear window functions will still be available.
A third press of the 'ECON/OFF' switch returns the system to normal (A/C) operation and extinguishes the 'OFF' LED. The
system can be returned to automatic operation at any time by pressing the 'AUTO' switch mounted in the central (blower
motor) rotary controller.
Stop/Start Vehicles - From 2010 MY
From 2010 MY, the 'ECON' switch will be labeled ‘A/C’ to prevent confusion with the ‘Eco’ switch which operates the
‘Stop/Start’ and 'Gear Change Indicator' systems.
For additional information, refer to:
Starting System
(303-06C Starting System - TD4 2.2L Diesel, Vehicles Built From:
01-03-2009, Description and Operation).
Programmed Defrost
The programmed defrost function is only available on vehicles fitted with a dual zone heating, ventilation and A/C system.
The function is selected by pressing the 'PROG' momentary switch on the control panel. When selected, the ATC module
provides maximum windshield defrosting/demisting by configuring the system as follows:
'AUTO' mode off
Intake air set to fresh air
Air distribution set to windshield
Blower motor speed set to maximum
Heated windshield on
Rear window heater on.
W hen programmed defrost is selected, the set temperature will remain unchanged. Programmed defrost can be cancelled by
any of the following methods:
Pressing any air distribution momentary switch
Pressing the 'AUTO' switch located in the center of the blower motor rotary controller
Pressing the 'PROG' momentary switch a second time.
• NOTE: Blower motor speed can be adjusted without terminating programmed defrost.
Windshield Heater
The windshield heater comprises 2 heater elements, LH and RH, bonded between the glass laminations. The system is
switched on by pressing the momentary switch located on the control panel. W hen selected, the ATC module transmits a
heating request on the high speed CAN bus to the CJB. On receipt of the message, the CJB energizes the windshield heater
relay located in the BJB by providing a ground path for the relay coil. The energized relay provides a battery feed to both
heater elements. After a period of 4 minutes the ATC module removes the request for windshield heating. The CJB then
powers down the windshield heater by removing the ground path for the relay coil.
The ATC module will only request windshield heater operation if the engine is running. An engine status signal is provided to
the ATC module by the ECM over the high speed CAN bus.