ATC ECU (page 2 of 5)

AIR CONDITIONING

DESCRIPTION AND OPERATION

82-21

The switches on the low line control panel have the following functions:

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Windscreen Heater Switch: Enabled only with the engine running. Pressing the switch energises the windscreen 
heater and the windscreen wiper parking area heater for a set time period, until the switch is pressed again or 
until the engine stops, whichever occurs first. A LED above the switch is illuminated while the heaters are on.

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LH and RH Seat Heater Switches: Activates the heater elements in the seat cushion and seat back at one of two 
heat levels. The first press of the switch energises the heater elements at the higher heat setting and illuminates 
two LED in the switch. A second press of the switch sets the heater elements to the lower heat setting and 
extinguishes one of the LED's. A further press of the switch de-energises the heater elements and extinguishes 
the second LED. The seat heaters remain on until selected off or the ignition is switched off.

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Temperature Switch: Adjusts the passenger compartment nominal temperature setting between 16 and 28 

°

C 

(60 and 84 

°

F). The temperature range is engraved on the switch surround (

°

F for NAS, 

°

C for rest of world). A 

pointer on the switch indicates the selected temperature. In the minimum and maximum temperature positions, 
the temperature is set to maximum cooling or maximum heating respectively.

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Blower Switch: For manual adjustment of blower speed. Up to seven LED's in the switch surround illuminate to 
indicate the selected blower speed.

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Distribution Control Knob: For manual adjustment of air distribution. Includes AUTO setting where distribution 
flaps are set to a nominal comfort position.

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A/C Switch: Activates the A/C compressor. Allows the A/C compressor to be selected off for economy operation. 
A LED above the switch is illuminated when the A/C compressor is selected on.

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Recirculation Switch: For manual selection of fresh or recirculated air. A LED above the switch is illuminated 
when recirculated air is selected.

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Rear Window Heater Switch: Enabled only with the engine running. Pressing the switch energises the rear 
window heater for a set time period, until the switch is pressed again or until the engine stops, whichever occurs 
first. A LED above the switch is illuminated while the heater is on.