Control System
A. Wiring diagrams
Tempmatic control system, model 201.024 up to model year 84
1 In-car temperature sensor
2 Ambient sensor, outside air temperature
3 Temperature sensor, air conditioning
4 Feedback potentiometer for flap position
5 Push-button switch unit,consisting of:
a Temperature wheel
b Push-button switch unit
c Mode switches for air conditioning
Air conditioning on,controlled via temperature sensor (3) to 0 °C evaporator temperature
Air conditioning controlled via push-button switch unit (electronic system)
Air conditioning off
d Relay for refrigerant compressor
e Relay for recirculating pump stroke)
f Lights
g Fuse: 2 amps
h 12-pin connector at left side of push-button switch unit
i 12-pin connector, at right side of push-button switch unit
6 Connector terminal 58d
7 Starter switch
8 Blower motor
9 Pre-resistor, blower motor
10 Electrical center with fuses
Fuse 1 = 16 A
Fuse 3 = 16 A
11 Switchover valve unit,4 connections
11.4 Switchover valve for blend air flaps ("cold")
11.3 Switchover valve for blend air flaps ("warm")
11.5 Switchover valve for heater valve ("closed")
11.1 Switchover valve for heater valve ("open")
12 Switchover valve unit,5 connections
12.8 Switchover valve for legroom flaps
12.9 Switchover valve for fresh air/recirculating air flap (small)
12.10 Switchover valve for fresh air/recirculating air flap (large stroke)
12.6 Switchover valve for defroster nozzle valves (small stroke)
12.7 Switchover valve for defroster nozzle flaps (large stroke)
13 Recirculating pump
14 Aspirator blower for in-car temperature sensor
15 Blower switch
16 Temperature switch 100 °C for auxiliary fan
17 Relay auxiliary fan pre-resistor
18 Pre-resistor auxiliary fan
19 Pressure switch auxiliary fan On 20 bar/Off 15 bar
20 Relay auxiliary fan
21 Auxiliary fan
22 Pressure switch refrigerant compressor On 2.6 bar/Off 2.0 bar
26 Switch, fresh air/recirculating air
143 Electromagnetic clutch
Refrigerant compressor
A To electronic control unit.
(CIS-E) terminal 19
C To hazard warning switch
(connection terminal 15)
D From seat belt indicator, terminal 8
M1 Common ground (behind instrument cluster)
M5 Ground connection, engine (unit screwed into engine)
M9 Ground connection, front left (near headlight)
M10 Ground connection, battery
Tempmatic control system, model 201.024 starting model year 85
1 In-car temperature sensor
2 Ambient sensor, outside air temperature
3 Temperature sensor, air conditioning
4 Feedback potentiometer for flap position
5 Push-button switch unit, consisting of:
a Temperature wheel
b Push-button switch unit
c Mode switches for air conditioning
Air conditioning on, controlled via temperature sensor (3) to 0 °C evaporator temperature
Air conditioning controlled via push-button switch unit (electronic system)
Air conditioning off
d Relay for refrigerant compressor
e Relay for recirculating pump
f Lights
g Fuse: 2 amps
h 12-pin connector at left side of push-button switch unit
i 12-pin connector, at right side of push-button switch unit
6 Connector terminal 58d
7 Starter switch
8 Blower motor
9 Pre-resistor, blower motor
10 Electrical center with fuses
Fuse 1 = 16 A
Fuse 3 = 16 A
11 Switchover valve unit,4 connections.
11.4 Switchover valve for blend air flaps ("cold")
11.3 Switchover valve for blend air flaps ("warm")
11.5 Switchover valve for heater valve ("closed")
11.1 Switchover valve for heater valve ("open")
12 Switchover valve unit, 5 connections
12.8 Switchover valve for legroom flaps
12.9 Switchover valve for fresh air/recirculating air flap (small stroke)
12.10 Switchover valve for fresh air/ recirculating air flap (large stroke)
12.6 Switch over valve for defroster nozzle valves (small stroke)
12.7 Switchover valve for defroster nozzle flaps (large stroke)
13 Recirculating pump
14 Aspirator blower for in-car temperature sensor
15 Blower motor
16 Temperature switch
a 100 °C for electromagnetic clutch, engine fan
b 110 °C for auxiliary fan
17 Relay auxiliary fan pre-resistor
18 Pre-resistor auxiliary fan
19 Pressure switch auxiliary fan On 20 bar/off 15 bar
20 Relay auxiliary fan
21 Auxiliary fan
22 Pressure switch refrigerant compressor
On 2.6 bar/off 2.0 bar
23 Temperature switch 110 °C for compressor cutout
26 Switch, fresh air/recirculating air
30 Socket (diagnosis) with line connector TD
141 Control unit compressor cutout
143 Electromagnetic clutch
Refrigerant compressor
144 Rpm sensor, refrigerant compressor
A To electronic control unit
(CIS-E) terminal 19
C To hazard warning switch
(connection terminal 15)
D From seat belt indicator.
Terminal 8
(connection terminal 15)
E To electrically heated windshield
washer nozzle (terminal 15)
F To electromagnetic clutch engine fan
M1 Common ground (behind instrument cluster)
M5 Ground connection, engine
(unit screwed into engine)
M9 Ground connection, front left (near headlight)
M10 Ground connection, battery
Tempmatic control system, model 201.122 up to model year 84
1 In-car temperature sensor
2 Ambient sensor, outside air temperature
3 Temperature sensor, air conditioning
4 Feedback potentiometer for flap position
5 Push-button switch unit,consisting of:
a Temperature wheel
b Push-button switch unit
c Mode switches for air conditioning
Air conditioning on, controlled via temperature sensor (3) to 0 °C evaporator temperature
Air conditioning controlled via push-button switch unit (electronic system)
Air conditioning off
d Relay for refrigerant compressor
e Relay for recirculating pump
f Lights
g Fuse: 2 amps
h 12-pin connector at left side of push-button switch unit
i 12-pin connector, at right side of push-button switch unit
6 Connector terminal 58d
7 Preglow start switch
8 Blower motor
9 Pre-resistor, blower motor
10 Electrical center with fuses
Fuse 1=16 A
Fuse 3=16 A
11 Switchover valve unit,4 connections
11.4 Switchover valve for blend air flaps ("cold")
11.3 Switchover valve for blend air flaps ("warm")
11.5 Switchover valve for heater valve ("closed")
11.1 Switchover valve for heater valve ("open")
12 Switchover valve unit, 5 connections
12.8 Switchover valve for legroom flaps
12.9 Switchover valve for fresh air/recirculating air flap (small stroke)
12.10 Switchover valve for fresh air/ recirculating air flap (large stroke)
12.6 Switchover valve for defroster nozzle valves (small stroke)
12.7 Switchover valve for defroster nozzle flaps (large stroke)
13 Recirculating pump
14 Aspirator blower for in-car temperature sensor
15 Blower motor
16 Temperature switch 100°C for auxiliary fan
17 Relay auxiliary fan pre-resistor
18 Pre-resistor auxiliary fan On 20 bar/off 15 bar
19 Pressure switch auxiliary fan
20 Relay auxiliary fan
21 Auxiliary fan
22 Pressure switch refrigerant compressor On 2.6 bar/off 2.0 bar
26 Switch, fresh air/recirculating air
127 Switchover valve rpm stabilization (with automatic transmission only)
132 Rpm sensor ring gear for flywheel
134/1 Microswitch for compressor cutout at full load (connected only on vehicles with automatic transmission)
141 Control unit compressor cutout
143 Electromagnetic clutch
Refrigerant compressor
144 Rpm sensor, refrigerant compressor
A To 4-pin plug connection, interior
B To relay kickdown limit.
terminal 2
C To hazard warning switch
(connection terminal 15)
D From seat belt indicator,
terminal 8
(connection terminal 15)
E To switchover valves for EGR
(California only)
M1 Main ground (behind instrument cluster)
M5 Ground connection, engine
(unit screwed into engine)
M9 Ground connection, front left
(near headlight)
M10 Ground connection, battery
Tempmatic control system, model 201.122 starting model year 85
1 In-car temperature sensor
2 Ambient sensor, outside air temperature
3 Temperature sensor, air conditioning
4 Feedback potentiometer for flap position
5 Push-button switch unit, consisting of:
a Temperature wheel
b Push-button switch unit
c Mode switches for air conditioning
Air conditioning on, controlled via temperature sensor (3) to 0 °C evaporator temperature
Air conditioning controlled via push-button switch unit (electronic system)
Air conditioning off
d Relay for refrigerant compressor
e Relay for recirculating pump
f Lights
g Fuse: 2 amps
h 12-pin connector at left side of push-button switch unit
i 12-pin connector, at right side of push-button switch unit
6 Connector terminal 58d
7 Preglow starter switch
8 Blower motor
9 Pre-resistor, blower motor
10 Electrical center with fuses
Fuse 1 = 16 A
Fuse 3 = 16 A
11 Switchover valve unit,4 connections
11.4 Switchover valve for blend air flaps ("cold")
11.3 Switchover valve for blend air flaps ("warm")
11.5 Switchover valve for heater valve ("closed")
11.1 Switchover valve for heater valve ("open")
12 Switchover valve unit, 5 connections
12.8 Switchover valve for legroom flaps
12.9 Switchover valve for fresh air/recirculating air flap (small stroke)
12.10 Switchover valve for fresh air/recirculating air flap (large stroke)
12.6 Switchover valve for defroster nozzle valves (small stroke)
12.7 Switchover valve for defroster nozzle flaps (large stroke)
13 Recirculating pump
14 Aspirator blower for in-car temperature sensor
15 Blower motor
16 Temperature switch
a 100 °C for electromagnetic clutch, engine fan
b 110 °C for auxiliary fan
17 Relay auxiliary fan pre-resistor
18 Pre-resistor auxiliary fan
19 Pressure switch auxiliary fan On 20 bar/off 15 bar
20 Relay auxiliary fan
21 Auxiliary fan
22 Pressure twitch refrigerant compressor
On 2.6 bar/off 2.0 bar
26 Switch, fresh air/recirculating air
132 Rpm sensor ring gear for flywheel
134/1 Microswitch for compressor cutout at full load (connected only on vehicles with automatic transmission)
141 Control unit compressor cutout
143 Electromagnetic clutch Refrigerant compressor
144 Rpm sensor, refrigerant compressor
A To electromagnetic clutch engine fan
B To control unit emission control, terminal 6
C To hazard warning switch (connection terminal 15)
D From seat belt indicator, terminal 8
(connection terminal 15)
E To control unit emission control, terminal 4
F To control unit electronic idle speed control terminal 10
G To kickdown switch
H To switchover valves for EGR
M1 Main ground (behind instrument cluster)
M5 Ground connection, engine (unit screwed into engine)
M9 Ground connection, front left (near headlight)
M10 Ground connection, battery
B. Vacuum diagram
Mode selection "Normal A/C or Vents" cooling - fresh air
11 Switchover valve unit, 4 connections
11.5 Switchover valve for heater valve ("closed")
11.4 Switchover valve for blend air flaps ("cold")
11.3 Switchover valve for blend air flaps ("warm")
11.1 Switchover valve for heater valve ("open")
12 Switchover valve unit, 5 connections
12.10 Switchover valve for fresh air/recirculating air flap (large stroke)
12.9 Switchover valve for fresh air/recirculating air flap (short stroke)
12.8 Switchover valve for legroom flaps
12.7 Switchover valve for defroster nozzle flaps (large stroke)
12.6 Switchover valve for defroster nozzle flaps (short stroke)
30 Vacuum connection on intake manifold
31 Check valve
33 Vacuum reservoir
34 Evaporator housing with fresh air/recirculating air flap
37 Vacuum element for blend air flaps("cold")
38 Vacuum element for defroster outlet flaps (flaps "closed")
39 Vacuum element for legroom flaps (flaps "closed")
40 Vacuum element for fresh air/recirculating air flap (flap "open")
41 Vacuum element for heater valve (heater valve "closed")
41a Orifice
47 Closing cap
48 Orifice (vented within 20 seconds)
49 3-point distributor
50 Connecting hose
bl = blue
drt = dark red
ge = yellow
gn = green
gr = grey
hbl = light blue
mgn = middle green
rt = red
ws = white