Damper Motors / Electric Rear Window Heater

Damper Actuating Motors And Electric Heater For Rear Window Diagrams:

Damper Actuating Motors And Electric Heater For Rear Window Components:

Locations of components

3 Earthing point, facia
At the left-hand front speaker socket

7 Earthing point
On the left-hand wheel housing

22A Fuse board
Behind the access panel in the glove compartment

47J Indicating lamp for the rear-window electric heater
In the combined instrument

59 Two-pole connector
One adjacent to ventilation fan motor 199
One adjacent to recirculation damper actuating motor 198

113 Relay for the electric heater for the rear window
In the electrical distribution box behind the glove compartment

115 Electric heater for the rear window

122 Eight-pole connector
Behind the glove compartment, on the servo-motor unit

123 Four-pole connector (1987)
Adjacent to fan speed control 220

158 Negative distribution terminal
In the electrical distribution box behind the glove compartment

198 Recirculation damper motor ACC
On the right-hand side of the engine compartment, at the top

199 Motor for the ventilation fan - ACC
In the fan housing behind the bulkhead partition

207 Heating element
In each rear-view mirror

216 Climate control unit
On the facia

220 Speed control for the ventilation fan
On the evaporator housing, immediately behind the bulkhead partition

221 Air distribution damper motor
Behind the glove compartment, on the servo-motor unit

222 Temperature control damper motor
Behind the glove compartment, on the servo-motor unit

230 Distribution terminal +30
In the electrical distribution box behind the glove compartment

231 Distribution terminal +54
In the electrical distribution box behind the glove compartment

Operation
The climate control unit controls the following functions/units:

Ventilation fan 199, across speed control 220. The speed is steplessly adjustable, and the control is connected to pins 21 and 22.

Motor 222 for the air-mixing damper, which routes the air either through the heat exchanger or past it. The motor is connected to pins 6 and 7.

Motor 221 for the air distribution damper which guides the air through the defroster and/or ventilation air outlets. The motor is connected to pins 8 and 9.

Motor 198 for the recirculation damper. When the damper is closed, air is drawn from outside the car. When it is open (in the recirculation position), the air in the interior is recirculated. The motor is connected to pins 10 and 11 on the unit.

Electric heater 115 for the rear window and heater elements 207 for the outer rear-view mirrors, controlled across relay 113. The relay is connected to pin 24. The connection of the relay is shown in detail in the section entitled "Electric heating for the rear window".

Servo-motors 221 and 222 for the air-mixing and air distribution dampers are equipped with potentiometers which are mechanically connected to each shaft. The potentiometers provide information to the climate control unit on the angle of each damper.

The potentiometer for motor 221 is connected to pin 5, whereas that for motor 222 is connected to pin 17.