mercedes 190e

Model years 1985, 1986, 1987 Appendix

www.WorkshopManuals.co.uk

Model Year 1985

Tempmatic climate control, model 201, model year 1985

Differences from model year 1984:

1. Air conditioning compressor,model 201.024

Model 201.024 now has the swash platecompressor (Nippondenso) used on model 201.122.Due to the installation of the single belt drive onengine 102, the same compressor cut-out (as onengine 601) is used to prevent belt damage in casethe compressor jams.

Fig. 208 Location of temperature switchllOC(23)

Fig. 207 Air conditioning compressor (143),model 201.024

2. Air conditioning compressor cut-out

A similar control unit as used on model 201.024 isinstalled in model 201.122. Both control units aredesigned for a delayed compressor cut-in. Thecompressor is activated 10 seconds after anengine speed of 600 rpm is reached. This improvesengine speed stabilization after start-up.

To prevent the 102 engine from overheating, thecontrol unit has an additional integrated cut-outcircuit. At a coolant temperature of 1 lo%, thiscircuit is grounded through temperature switch(23) and the compressor stops working. At approx.103C, the temperature switch opens and thecompressor comes on again.

3. Temperature switch for engine fan clutch(lOOC) and auxiliary fan (11OOC)

This temperature switch (16) has three connectionsand two switch functions. One switches the fanclutch on at lOOC, the other switches the auxiliaryfan on at 110 C.

On model 201.024, the engine fan clutch controland the relay for the auxiliary fan are now switchedthrough the positive side of the electrical circuit(see wiring diagrams).

The previous temperature switch for the auxiliaryfan in 201 models was therefore eliminated.


Model Year 1985

Fig. 209 Location of coolant temperatureswitch 1001110 C (16), model201.024

Fig. 210 Location of coolant temperatureswitch 1001110C (16), model201 .122

Important:

Air conditioning compressor switching waschanged from the positive to the negative sidethe electrical circuit.

This means that with the ignition and tempmatclimate control switched on, the low pressureswitch and the control unit are connected toground (M 10).

of

ic


Model Year 1985

Fig. 211 Wiring diagram, tempmatic climate control, model 201.0241 In-car temperature sensor2 Ambient sensor, outside air

temperature3 Temperature sensor, air conditioning

evaporator4 Feedback potentiometer5 Pushbutton switch unit, consisting

of:Temperature wheelPushbutton switch with sixbuttonsMode switch for air conditioningcompressor with three buttons

air conditioning on,controlled via temperature sensor(3) to 0 C evaporator temperature

air conditioning, controlledvia pushbutton switch unit(electronic system)

air conditioning offRelay for air conditioningcompressorRelay for auxiliary coolant pumpLightsFuse: 2 amps12-pin connector, at left side ofpushbutton switch unit12-pin connector, at right side ofpushbutton switch unit

6 Terminal block, circuit 58d8 Blower motor9 Pre-resistor, blower motor

10 Electrical center with fusesFuse 1 = 16 AFuse 3 = 16 A

11 Switchover valve unit, 4 connections11.4 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 unrt, 5 connections

12.8

12.9

12.10

12.6

12.7

Switchover valve for legroomflapsSwitchover valve for fresh air/recirculating air flap (shortstroke)Switchover valve for fresh air/recirculating air flap (longstroke)Switchover valve for defrosternozzle flaps (short stroke)Switchover valve for defrosternozzle flaps (long stroke)

13 Auxiliary coolant pump14 Aspirator blower for in-car

temperature sensor15 Blower switch16 a Coolant temperature switch

(100C) for engine fan clutchb Coolant temperature switch

(110%) for auxiliary fan (highspeed)

171819

202122

23

26

30

141

143144M l

M 5

M9

Relay, auxiliary fan pre-resistorPre-resistor, auxiliary fanHigh pressure switch, auxiliary fan(low speed): On 20 bar/Off 15 barRelay, auxilrary fanAuxiliary fanLow pressure switch, arrconditioning compressor cut-out:On 2.6 bar/Off 2.0 barCoolant temperature switch (110C)for compressor (high temperaturecut-out)Switch, fresh airlrecrrculatrng airA To electronic control unit C-IS-E,

terminal 19C To hazard warnrng switch,

terminal 15D To seat belt Indicator, terminal 8

circurt 15E To heated windshield washer

nozzle (circuit 15)F To engine fan clutchTerminal block for circuit TD (bydiagnostic socket)Control unit for compressorprotective cut-outElectromagnetrc clutch, compressorRPM sensor, compressor shaftCommon ground connection (behindinstrument cluster)Ground connection, engine (unitscrewed into engine)Ground connectron, front left (nearheadlight)

M 10 Ground connectron, battery

4


Model Year 1985

Fig. 212 Wiring diagram, tempmatic climate control, model 201.122lncar temperature sensorAmbient sensor, outstde arrtemperatureTemperature sensor, air conditioningevaporatorFeedback potentiometerPushbutton swatch umt, consistingof:a Temperature wheelb Pushbutton switch with six

buttonsc Mode switch for air conditioning

compressor wrth three buttonsarr conditioning on,

controlled via temperature sensor(3) to 0% evaporator temperature

air conditioning, controlledvia pushbutton switch unit(electromc system)

arr conditioning offd Relay for air conditioning

compressore Relay for auxiliary coolant pumpf Lightsg Fuse: 2 ampsh 12-pin connector, at left side of

pushbutton switch unitj 12.pin connector, at right side of

pushbutton switch unitTerminal block, circuit 56dPreglow starter switchBlower motorPm-resistor, blower motorElectrical center with fusesFuse1=16AFuse3=16A

11 Switchover valve unit, 4 connections11.4 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 .l Switchover valve for heater

valve (open)

2

3

45

6769

10

12

1314

1516

171619

Switchover valve unit, 5 connections12.6 Switchover valve for legroom

flaps12.9 Switchover valve for fresh air/

recirculating air flap (shortstroke)

12.10 Switchover valve for fresh air/recirculating air flap (longstroke)

12.6 Switchover valve for defrosternozzle flaps (short stroke)

12.7 Switchover valve for defrosternozzle flaps (long stroke)

Auxiliary coolant pumpAspirator blower for incartemperature sensorBlower switcha Coolant temperature switch

(100%) for engine fan clutchb Coolant temperature switch

(1lOC) for auxiliary fan (hlghspeed)

Relay, auxiliary fan pre-resistorPre-resistor, auxiliary fanHlgh preeaure switch, auxillaty fan(low speed): On 20 bar/Off 15 bar

202122

2613213411

141

143

144

M l

MS

MQ

M 10

Relay, auxiliary fanAuxiliary fanLow pressure switch, airconditioning compressor cut-out:On 2.6 bar/Off 2.0 barSwitch, fresh air/recirculating airRpm sensor, ring gearMicroswitch for compressor cut-out at full load (only connected onvehicles with automatictransmission)Control unit for compressorprotective cutoutElectromagnetic clutch,compressorRpm sensor, compressor shaftA Coolant temperature switch

(100%) for engme fan clutchB To control unit, EGR, terminal 6C To hazard warning switch,

circurt 150 To seat belt indicator, terminal 6

(circuit 15)E To control unit, EGR, terminal 4F To control unit, electronic idle

speed, terminal 10G To klckdown switchH To switchover valves, EGRCommon ground connectlon(behind Instrument cluster)Ground connectlon, engine (unitscrewed Into englne)Ground connectlon, front left (nearheadlIght)Ground connectlon, battery

5


Model Year 1986

Tempmatic climate control, model year 1986

Modifications as compared with model year 1985

Model 201.024

Activation of electromagnetic clutchfor engine fan

At a refrigerant pressure of 20 bar the pressure switch(S 32) activates the low speed of the auxiliary fan andthe electromagnetic clutch for engine fan via doublecontact relay (K 8).

Formerly only the auxiliary fan was activated by therefrigerant high pressure switch (S 32).

Fig. 83/27S 32 Refrigerant high pressure switch

laux fan low and engme fan)

Fig. 83128K 8 Double contact relay

6


Model Year 1986

Model 201 .126

Layout and function are similar to A/C compressorprotective cutout of model 201.122 model year 1985.

The switch (S 32) activates only the aux. fan low (en-gine has visco-fan).

A/C compressor overheating cut-out,models 201.0241.126

To prevent overheating of the engine, a cutout hasbeen integrated in control unit (N6). At approx. 115C(engine 602), 110C (engine 102) coolant tempera-ture the temperature switch (S 25/5 or S 25/3) willswitch to ground so that the A/C compressor isswitched off via the control unit. The temperatureswitch opens at approx. 108C (engine 602), 103C(engine 102) and the A/C compressor switches onagain via control unit (N6).

Fig. 83/29 Engine 102S 2513 Coolant temperature switch 110 C

(A/C compressor cut-out]

Fig. 83/30 Engine 602S 2515 Coolant temperature swatch 105/l 15 C

a 105 C. aux fan (high speed)b 115 C. A/C compressor cut-out

7


Model Year 1986

N19Il

Fig. 83/31 Wiring diagram, tempmatic climate control, Model 201.024B 1014 In-car temperature sensorB 1015 Outside arr temperature sensorB 1016 Evaporator temperature sensorF 1 Electrical center Fuse 1 - 16 A

K 8

K 9L 4M 2M 4M 9M 13N 6N 19/l

Fuse3-16ADouble contact relay, auxtllary fan lowand engine fan clutchRelay, auxtllary fan highRpm sensor, A/C compressorBlower motorAuxiliary fan

R 14R 15R 23S 2/ls 3S 24S 2513

Aspirator blower for in-car sensorAuxrkary coolant pumpCompressor cut-out control unitPushbutton switch umta Relay for A/C compressorb Relay for aux coolant pumpc Illuminationd Fuse - 2 APre-reslstor for blower motorPre-resistor for aux fanFeedback potentiometerIgnlhon-starter switchBlower switchFresh/recirculation switchCoolant temperature,engine overheat (1 1 Oc),A/C compressor cut-out

S 2514

s 31

S 32

W 1

w 5w 9w 11X 6x 11x 15

Y 2Y 5/l

Y 25

Coolant temperature switch 100/l 10-Ca 100C for engine fan clutchb 1 lo% for aux fan ( HI)Refrigerant low pressure switch(compressor)Closed 2 6 bar/Open 2 0 barRefrigerant high pressure switch(aux fan low and engine fan clutch)Closed 20 bar/open 15 barCommon ground(behind Instrument cluster)Enqme qround

Y 26 Switchover valve umt. 5 connections8 SwItchover valve for legroom flaps9 Switchover valve for fresh/

recirculating air flap (short stroke)10 Switchover valve for fresh/

recirculating air flap (long stroke)6 Switchover valve for defroster flaps

(short stroke)7 Switchover valve for defroster flaps

(long stroke)a To control unit for CIS-E system

pm socket 19Ground, at front headlamp CGround, engme (electnc wire connechon) dTerminal block 58 dDlagnostrc plug eConnector plug, engine fan tocoolant temperature switch (S 25/4) fEngine fan clutch gElectromagnehc clutchfor A/C compressorSwitchover valve unit, 4 connechons4 Switchover valve for blend air

To hazard warning switch terminal 15From fasten seat belt Indicator,terminal 8 (connection terminal 15)To heated windshield washer nozzle(termmal 15)To fuel pump relay pm socket 10To tachometer

flaps (cold)3 Switchover valve for blend air

flaps (warm)5 Swrtchover valve for heater valve

(opens)1 Switchover valve for heater valve

(open)

8


Model Year 1986

N1911

Fig. 83/32 Wiring diagram, tempmatic climate control, Model 201.126B 10/4B 1015B 1016F 1

In-car temperature sensorOutside arr temperature sensorEvaporator temperature sensorElectrical center Fuse 1 - 16 A

S 24s 25/5

Fresh/recrrculatron swatchCoolant temperature swatch 105/l 15%

K 9K 10L 3L 4M 2M 4M 9M 13N 6N 8N 19/l

R 14R 15R 23S 212s 3

Fuse3- 16ARelay, auxtkary fanRelay, auxrlrary fan pre-resistorRpm sensor, flywheel ring gearRpm sensor, A/C compressorBlower motorAuxrliary fanAsprrator blower for m-car sensorAuxrlrary coolant pumpCompressor cut-out control unrtIdle rpm control unitPush button switch unita Relay for A/C compressorb Relay for aux coolant pumpc Illuminationd Fuse - 2 APre-resrstor for blower motorPre-resistor for aux fanFeedback potentrometerPre-glow starter switchBlower swatch

s 27/l

s 31

S 32

w 1

w 9w 10X 6x 29/lY 5/l

a 105% for aux fan ( HI)b 1 15% engine overheat

A/C compressor cut-outMIcroswitch for A/C compressorcut-out at full throttle(only connected with auto trans )Refrigerant low pressure swatch(A/C compressor cut-out)Closed 2 6 bar/Open 2 0 barRefrigerant high pressure swatch(aux fan low)Closed 20 bar/Open 15 barCommon ground(behmd Instrument cluster)Ground, at front headlampBattery groundTerminal block 58 dTest connection for rpm signalElectromagnetic clutchfor A/C compressor

Y 25 Swrtchover valve unit, 4 connections4 Swrtchover valve for blend air

flaps (cold)3 Swrtchover valve for blend air

flaps (warm)5 Switchover valve for heater valve

(closed)1 Switchover valve for heater valve

(open)Y 26 Swrtchover valve unit, 5 connechons

8 Switchover valve for legroom flaps9 Swrtchover valve for fresh/

recirculating air flap (short stroke)10 Swrtchover valve for fresh/

recrrculatmg air flap (long stroke)6 Switchover valve for defroster flaps

(short stroke)7 Switchover valve for defroster flaps

(long stroke)C To hazard warning switch terminal 15d From fasten seat belt mdrcator,

termmal 8 (connectron terminal 15)

g To krckdown switchh To swrtchover valves for EGR

9


Model Year 1987__

Tempmatic climate control, model year 1987

Tempmatic climate control, model 201

Modifications as compared to Model Year 1986:

Fresh/recirculated air switch and tempmatic push-button control unit

The fresh/recirculated air switch has been integratedinto the tempmatic pushbutton control unit, in placeof the previous EC pushbutton. In addition, theoperation of the A/C mode pushbuttons, as well asthe symbol for the center button, have been modified(Fig. 83/l). Both A/C mode pushbuttons can beswitched on and off individually. If one pushbutton isdepressed, it will automatically cancel the other. Withboth A/C mode pushbuttons switched off, the climatecontrol operates as before in the economy (EC) set-ting (no A/C).

Fig. 83/l

Function of recirculated air mode

The function of the recirculated air mode is identicalto model 124, however, when depressing the recircu-lated air switch, the outside temperature must exceed15 C for the system to remain in the recirculated airmode for 30 minutes (in model 124, exceeding 7 C).

10


Model Year 1987

Function of dehumidifying mode

Pushing this button switches the compressor on tooperate until the evaporator reaches i-5 OC. The inte-rior temperature sensor has no influence.

Pushbutton control unit

Short-circuit proof design.

Override function during failure of a temperaturesensor or the feedback potentiometer.

Malfunction indication using light emitting diode(LED) blink code.

Short-circuit proof design

The circuit board in the tempmatic pushbutton con-trol unit is protected against shorts from any of its ex-ternally connected circuits. The respective outputsignal, i.e. blower and A/C compressor, is switchedoff, and the blend air flap remains in its present posi-tion. The respective output signals are switched onagain after the short-circuit has been eliminated.

Due to this modification, the two ampere fuse in thetempmatic pushbutton control unit is no longer re-quired.

Override function during failure of a termperaturesensor or feedback potentiometer

Then tempmatic pushbutton control unit switches toan override function if one of the following compo-nents fails:

In-car temperature sensor

Outside temperature sensor

Evaporator temperature sensor

Coolant temperature gauge sensor

Feedback potentiometer

In this case, the blend air flap remains in its presentposition. The heater valve remains open or opens.The blower continues to blow at the previously setspeed, and the legroom flaps open. All other func-tions are non-operational.

Malfunction indication using light emitting diode(LED) blink code

A defective temperature sensor or feedback potentio-meter is detected by the tempmatic pushbutton con-trol unit. The malfunction indication is conveyed in theform of voltage impulses (battery voltage) at terminal9 of the right connector on the tempmatic pushbuttoncontrol unit. These impulses can be read throughthe use of a LED (not a light bulb). The malfunctioningcomponent or respective wiring can be pinpointedaccording to the number of voltage impulses indicat-ed by the blinking LED. The LED will blink once foreach impulse. The voltage impulses have a frequencyof l/2 Hz. (two seconds).

Defectivecomponentwith wiring

In-car temp.sensor

Outside temp.sensor

Feed backpotentiometer

Evaporatortemp. sensor

Coolant temp.gauge sensor

--~ - --rNumber of Time ofvoltage impulseimpulses sequences(blinks) in seconds

2

5 10

10 I 20

15 I 30

20 40

tj 50

The malfunction indication repeats until the defect isno longer detected. There is a pause of four secondsbetween each sequence of impulses, at which pointthe opening and closing of the relay in the blowerswitch is audible (clicking noise), momentarilyswitching the blower off. This provides an additionalmethod for diagnosing the defective component bylistening to the relay and timing the impulse se-quences.

The test procedure for diagnosis using the LED blinkcode is on page 246.

11


Model Year 1987

Model 201.0291128

Auxiliary fan

Models 107, 124, 126, 201

2-Function refrigerant pressure switch

These models are equipped with dual electric auxili-ary fans. They are switched on simultaneously in thefirst speed at a refrigerant pressure of 20 bar and inthe second speed at an engine temperature of 105 C.At maximum speed, both auxiliary fans draw approx.26 Amps at 13 Volts battery voltage.

The auxiliary fans are attached to the condenser andcan only be removed after first removing the frontcenter reinforcement (arrow).

To prevent damage to the A/C compressor, a 2-func-tion refrigerant pressure switch (S 31 /l) is installed inthe receiver/dryer replacing the previous switch.

Function 1 (low pressure) activates if the refri-gerant level is too low or with no refrigerant insystem.

Cut-out pressure is approx. 2.0 bar.Cut-in pressure is approx. 2.6 bar.

Function 2 (high pressure) activates if the expan-sion valve becomes clogged or if the auxiliary fanfails to operate.

Cut-out pressure is approx. 30.0 bar.Cut-in pressure is approx. 22.0 bar.

Fig. 8312

M 4/l Left auxlllary fanM 4/2 Right auxlllary fan

Fig. 8313

S 3 111 2-Function refrigerant pressure switch

Model 201

Testing the temperature sensorsand the feedback potentiometer

Complaints resulting from a defective temperaturesensor or feedback potentiometer causing the blowerto switch off momentarily or the blower relay to makea clicking noise, can be more easily diagnosed usinga light emitting diode (LED) blink code.

Further test procedures are performed as before.

12


Model Year 1987

Diagnosis using LED blink code

Fig. 83/4 LED blink code tester

Special tools

Defectivecomponentand/or wiring

In-car temp.sensor

Outside temp.sensor

Feed backpotentiometer

Evaporatortemp. sensor

Coolant temp.gauge sensor

Number ofvoltageimpulses(blinks)

5

10

15

20

25

Time ofimpulsesequencesin seconds

10

20

30

40

50

II 124 589 00 21 00 201 589 09 63 00 /--900589002100 1L I L-_--J LA

Test procedure Modified test value for checking the feedbackpotentiometer

1. Remove pushbutton control unit. Connect socketbox tester cable to tempmatic pushbutton controlunit and unit wiring plugs.

2. Connect red wire of LED blink code tester tosocket 10 and brown wire of LED blink code testerto socket 9 of the socket box.

3. Turn ignition on and set temperature wheel to22 C. Pushbuttons can be in any position.

4. Count number of voltage impulses by countingthe blinking LED in the switch of the LED blinkcode tester.

5. Replace defective part or check respective wiring.

6. Repeat test procedure until no defects are detect-ed.

Due to modifications to the pushbutton switch, therequired voltage for adjustment of the feedbackpotentiometer, with the temperature selector in posi-tion MIN, is changed from 3.9-4.4 V to 2.4-2.7 V.

Note: We recommend to make the above change intest step 20 of your test chart Tempmatic, Model201.

13


Model Year 1987

0.75TJ Y2__

9

Fig. 83/5 Wiring diagram, Tempmatic climateA lplA 9A 9klA 911B 1 O/4B 1015B 1016813Fl

K8

K9M2M4M9M l 3N2/4

N 3N6N 19/l

Coolant temperature gaugeA/C compressorElectra-magnetrc clutchRPM sensorIn-car temperature sensorOutsIde temperature sensorEvaporator temperature sensorCoolant temperature gauge sensorElectrrcal center.Fuse 1 16AFuse 2 8AFuse 3 16AFuse 10 8AFuse 11 aADouble contact relay for auxllraryfan, low, and magnehc clutchfor engme fanAuxtlrary fan relay. highBlower motorAuxrltary fanAspirator blowerAuxiliary coolant pumpWarnmg module(seat belts, keys, lights)CIS-E control unitA/C compressor control unitTempmahc pushbutton control unit

R 14R15R23s2/1s 3/lS 2.513S 2514

ab

s31/1

S 32

Wl

W3

W5X 6x 11x 15

X 4811

X 48/2

:ontrol, model 201.028Blower motor prereslstor groupAuxrlrary fan prereslstorFeedback potentiometerIgnition/starter switchBlower swatch. Tempmatlc1 1 O0 C temperature switch100/l 10 C temperature swatch100 C for engine fan clutch1 10 C for auxiliary fanRefrigerant pressure switch.2-function (off 2 O/30 0 bar,on 2 6122 0 bar)Refrrgerant high pressure switch(auxiliary fan)(off 15 0 bar, on 20 0 bar)Mam ground, behrnd instrumentclusterGround, left front wheelhousmg(at ignrhon coil)Ground, engtneTerminal block, crrcurt 58dDragnoshc socket/termmal blockConnector, engine fan/100 C temp switch (S 25/4)Connector sleeve, crrcult TD(solder fomt m harness)Connector sleeve, circuit 15(solder Joint In harness)

Y 2

Y 25

Y 26

Electra-magnetrc engrnefan clutchSwitch-over valve unrt.4 connechons4 Switch-over valve for blendair flaps (cold)3 Switch-over valve for blendair flaps (warm)5 Swatch-over valve for heatervalve (closes)1 Switch-over valve for heatervalve (opens)Switch-over valve unit.5 connecttons8 Switch-over valve for legroomflaps9 Switch-over valvefor fresh/rectrculated air flap(short stroke)10 Switch-over valvefor fresh/recirculated air flap(long stroke)6 Switch-over valve for defrosterflaps (short stroke)7 Swatch-over valve for defrosterflaps (long stroke)

14


Model Year 1987

Fig. 83/6 Wiring diagram, Tempmatic climate control, model 201.029A lplA 9A9klA911B 1014B lOf50 1016813Fl

Kf3

K 8/lM2M4/1M4/2M9M l 3N 214

N3N 6

Coolant temperature gaugeA/C compressorElectra-magnetrc clutchRPM sensorin-car temperature sensorOutsrde temperature sensorEvaporator temperature sensorCoolant temperature gauge sensorElectrical center,Fuse 1 16AFuse 2 8AFuse 3 16AFuse 10 8AFuse 11 8ADouble contact relay for auxrlraryfan, low, and magnetrc clutchfor engme fanRelay for dual auxrltary fan, hrghBlower motorLeft auxrlrary fanRight auxrlrary fanAspirator blowerAuxrkary coolant pumpWarnmg module(seat belts, keys, lights)CIS-E control unitA/C compressor control unit

N 19/lR14R15R23s2/1s 3/ls 2515

ab

s31/1

S32

Wl

w 3

W5X 6x 11

x40/1

X 4072

Tempmatic pushbutton control unitBlower motor preresrstor groupAuxiliary fan preresrstorFeedback potentrometerIgnmon/starter switchBlower switch105/l 15O C temperature switch105O C for auxiliary fan115 C for A/C compressoremergency cut-outRefrigerant pressure switch,2-functron (off 2.0130 0 bar,on 2 6122 0 bar)Refrigerant high pressure switch(auxiliary fan)(off 15 0 bar, on 20 0 bar)Main ground, behmd instrumentclusterGround, left front wheelhousmg(at ignition coil)Ground, engineTerminal block, circuit 58dDragnosttc sockebtermmal block(crrcurt TD)Connector sleeve, crrcurt TD(solder joint m harness)Connector sleeve, circuit 15(solder joint in harness)

Y 25

Y 26

1i

I1 A9 kl 1831-14329/l

Switch-over valve unit.4 connections4 Switch-over valve for blendarr flaps (cold)3 Switch-over valve for blendair flaps (warm)5 Switch-over valve for heatervalve (closes)1 Switch-over valve for heatervalve (opens)Switch-over valve unit,5 connectionsEt Switch-over valve for legroomflaps9 Switch-over valvefor fresh/recirculated air flap(short stroke)10 Switch-over valvefor fresh/recrrculated air flap(long stroke)6 Switch-over valve for defrosterflaps (short stroke)7 Switch-over valve for defrosterflaps (long stroke)

15


Model Year 1987

b.w.u>e&w2Alp1 813 M4

Fig. 83/7 Wiring diagram, Tempmatic climate control, model 201.034Coolant temperature gaugeA/C compressorElectra-magnetic clutchRPM sensorIn-car temperature sensorOutside temperature sensorEvaporator temperature sensorCoolant temperature gauge sensorElectrical center,Fuse 1: 16AFuse 2 8AFuse 3. 16AFuse 10: 8AFuse 11: 8ADouble contact relay for auxiliaryfan, low, and magnetic clutchfor engine fanRelay for auxiliary fan, highBlower motorAuxiliary fanAspirator blowerAuxiliary coolant pumpWarnmg module(seat belts, keys, lights)CIS-E control unitA/C compressor control unitTempmatic pushbuttoncontrol unit

R14R15R23s 2/ls 3/ls 25/ls 2575

ab

A lplA 9A9klA911B 1014B 10/5B 10/6B 13Fl

K8

K9M2M4M9M l 3N 214

N 3N 6N 19/l

s31/1

S32

Wl

w 3

w 5X 6x 11

x 1 5

X48/1

X 4812

Blower motor preresistor groupAuxiliary fan preresrstorFeedback potentiometerIgnition/starter switchBlower switch100 C temperature switch105/l 15 C temperature switch105 C for auxilrary fan115O C for A/C compressoremergency cut-outRefngerant pressure switch,P-function (off 2.0/30.0 bar,on 2.6722 0 bar)Refrigerant high pressure switch(off 15.0 bar, on 20.0 bar)Main ground, behind instrumentclusterGround, left front wheelhousing(at ignition corl)Ground, engineTerminal block, crrcuit 58dDiagnostic socket/terminal block(circuit TD)Connector, engine fan/l 00 Ctemperature switchConnector sleeve, crrcuit TD(solder joint in harness)Connector sleeve, circuit 15(solder joint in harness)

I1 A9 kl 1

Y 2 Electra-magnehc engmefan clutchSwitch-over valve unit,4 connections4 Switch-over valve for blendair flaps (cold)3 Switch-over valve for blend

Y 25

air flaps (warm)5 Switch-over valve for heatervalve (closes)1 Switch-over valve for heatervalve (opens)Switch-over valve unit.Y265 connections8 Switch-over valve for legroomflaps9 Switch-over valvefor fresh/recirculated air flap(short stroke)10 Switch-over valvefor fresh/recrrculated arr flap(long stroke)6 Switch-over valve for defrosterflaps (short stroke)7 Switch-over valve for defrosterflaps (long stroke)

16


Model Year 1987

M2 s311 -

A lplA 9A9klA911B 1 O/40 1 o/5B 1 O/68 1 3Fl

K9KlOL 3M2M4M9M l 3N 214

N6N8N 19/lR14R 15R23

Coolant temperature gaugeA/C compressorElectra-magnetrc clutchRPM sensorIn-car temperature sensorOutsrde temperature sensorEvaporator temperature sensorCoolant temperature gauge sensorElectrrcal center,Fuse 1 16AFuse 2 8AFuse 3 16AFuse 10 8AFuse 11 8ARelay for auxrlrary fan, hrghAuxrlrary fan pre-resrstor relayRmg gear speed sensorBlower motorAuxrlrary fanAsprrator blowerAuxrlrary coolant pumpWarning module(seat belts, keys, Irghts)A/C compressor control unitIdle speed control unitTempmatrc pushbutton control unitBlower motor preresistor groupAuxrlrary fan preresrstorFeedback potentrometer

s 2/2s3/1S 25/5

ab

S 27/6

s 30/ls31/1

S32

Wl

w 3

WlOX 6x ia/1

x 2911

x 4af2

x 59/l

Fig. 83/8 Wiring diagram, Tempmatic climate control, model 201.126Glow/starter switchBlower switch105/l 15 C temperature swatch105 C for auxiliary fan115. C for A/C compressoremergency cut-outA/C compressor and EGR cut-outmrcroswrtch (vehrcles wrthautomatrc transmission only)Krck-down switchRefrtgerant pressure switch.2-functron (off 2 O/30 0 bar.on 2 6/22 0 bar)Refrigerant hrgh pressure swatch(auxilrary fan)(off 15 0 bar, on 20 0 bar)Main ground, behmd instrumentclusterGround, left front wheelhousmg(at ignrtion coil)Ground, batteryTerminal block, crrcuit 58dConnector, tarllamp harness/A/C compressor harnessTest connectton,engine speed srgnal (EDS)Connector sleeve, crrcurt 15(solder tomt in harness)Connector, engine fan/coolanttemperature sensor

0-g SW WlOJJ-JJ=+0%N8rTy.- -

1631-14331~1

Y 3

Y 25

Y 26

Krckdown solenoid(automatic transmisston)Swatch-over valve unit,4 connections4 Swatch-over valve for blendarr flaps (cold)3 Swatch-over valve for blendair flaps (warm)5 Swatch-over valve for heatervalve (closes)1 Switch-over valve for heatervalve (opens)Swatch-over valve unrt,5 connections6 Swrtch-over valve for legroomflaps9 Switch-over valvefor fresh/recirculated air flap(short stroke)10 Swatch-over valvefor fresh/recirculated air flap(long stroke)6 Swatch-over valve for defrosterflaps (short stroke)7 Switch-over valve for defrosterflaps (long stroke)

a to EGR (II) control unit N37/2.terminal 2

b to EGR (II) control untt N37/2.terminal 5


Model Year 1987

Fig. 8319 Wiring diagram Tempmatic climate control, model 201 .128A lplA 9A 9klA911B 1 O/4B 1015B 1016813Fl

K8llKlOL 3M2M4/1M4l2M9M l 3N 214

N 6N 19/lN39R 14R 15R 23

Coolant temperature gaugeA/C compressorElectra-magnehc clutchRPM sensorIn-car temperature sensorOutsIde temperature sensorEvaporator temperature sensorCoolant temperature gauge sensorElectrrcal center,Fuse 1 16AFuse 2 8AFuse 3 16AFuse 10 16AFuse 11 8ARelay for dual auxrliary fan, hrghAuxllrary fan pre-reslstor relayRmg gear speed sensorBlower motorLeft auxrliary fanRrght auxrlrary fanAsprrator blowerAuxrllary coolant pumpWarning module(seat belts, keys, lights)A/C compressor control unitTempmatrc pushbutton control unitControl unit (EDS)Blower motor preresrstor groupAuxiliary fan preresrstorFeedback ootenhometer

s 2/2s 3/lS 2515

ab

s27

s 30/ls31/1

S32

Wl

w 3

WlOX 6X 18/l

X 4812

X 4814

x 59/l

x 92

Glow/starter switchBlower switch105/l 15 C temperature switch105O C for auxiliary fan115 C for A/C compressoremergency cut-outA/C compressor/boost pressure,cut-out microswitchKick-down switchRefrigerant pressure switch.2-function (off 2 O/30 0 bar,on 2 6122 0 bar)Refrtgerant high pressure switch(auxiliary fan)(off 15 0 bar, on 20 0 bar)Main ground, behind instrumentclusterGround, left front wheelhousmg(at rgnition coil)Ground, batteryTerminal block, crrcurt 58dConnector, taillamp harness/A/C compressor harnessConnector sleeve, circuit 15(solder fomt m harness) ,Connector sleeve, rpmsensor signal (solderfomt m harness)Connector, engine fan/coolanttemperature sensorTest plug (EDS) 8-pole

Y 3

Y 25

Y 26

ab

r-r0.75 0.75rl blbl plI.75

I/

0.75SW WEbl M

1ii

I1 A9 k l 1831-1432711

Krckdown solenord(automatic transmissron)Switch-over valve unit,4 connections4 Switch-over valve for blendair flaps (cold)3 Switch-over valve for blendair flaps (warm)5 Switch-over valve for heatervalve (closes)1 Switch-over valve for heatervalve (opens)Switch-over valve unit,5 connections8 Switch-over valve for legroomflaps9 Switch-over valvefor fresh/recrrculated arr flap(short stroke)10 Switch-over valvefor fresh/recrrculated an flap(long stroke)6 Switch-over valve for defrosterflaps (short stroke)7 Switch-over valve for defrosterflaps (long stroke)to clock/tachometer Al p7to engine overload protectionpressure switch

18


Model Year 1985Model Year 1986Model Year 1987

Exit:

mercedes 190e

Documents

oocthis temperature

previous temperature

air conditioning compressor

model years

sixbuttonsmode switch

switch functions

temperature sensor3

temperature switch23