Checking seat heating

1. Remove switch cover (4 screws).

2. Disengage seat heating switch and pull out switch (take care not to damage the wire).

3. Switch on ignition.

4. Connect voltmeter to term. 1 (positive) and term. 2 (negative).

1343 - 72

Display: approx. 5 V Note

If no voltage is displayed, check power supply according to wiring diagram.

5. Connect voltmeter to term. 2 (negative) and term. 3 (positive).

Display, depending on potentiometer setting: approx. 2 - 3 V

6. Push tip switch into "on" position and keep it in this position.

Display: approx. 5 V

7. Push tip switch into "off" position and keep it in this position.

Display: approx. 0 V

8. Turn knurled wheel of potentiometer all the way up.

Display: approx. 3 V

9. Turn knurled wheel of potentiometer all the way down. The voltage must then drop to approx. 2 V.

10. Remove seat and connect to Special Tool 9269.

11. Switch on seat heating and set to maximum heating output.

12. Measure voltage at 2-pin connector marked with digit 3.


When the seat heating is switched on, the voltage oscillates between 0 V and approx. 12 V (clocked voltage).

Checking resistance of heater elements Note

Use a digital ohmmeter for the measurements.

1. Disconnect connector marked with digit 3.

2. Zero out ohmmeter.

3. Connect ohmmeter on pin side. Display at 20' C ambient temperature: 1.5 to 1.8 n

Calibrating controllable seat heating

Control units Note

The seat heating must be calibrated after the control unit or heating elements have been replaced.

Installation position

At the bottom of the seat


Control unit for seat heating

A - measuring point (V) B - calibration potentiometer

Calibrating controllable seat heating 72 • 3

Printed in Germany - VIII, 1993



1. Digital-voltmeter with an internal resistance (Ri) >1 Mfl.

2. Two measuring probes with a maximum diameter of 2 mm.

3. Thermometer (as recommended in the Workshop Handbook).

5. Two auxiliary cables to supply voltage to the removed seat (terminals15 and 31). Use adapter cable 9269 for seat-position control.

Calibration procedure

1. Store the seat to be calibrated in the working area until it has assumed the ambient temperature.

2. Provide power supply.


Do not switch on the seat heating. If switched on unintentionally, the seat must cool down until the heating elements have again adopted the ambient temperature.

3. Measure the ambient temperature and refer to the table for the relevant voltage value.

4. Connect the voltmeter to the control unit (A).

5. Set the voltage value on the calibration potentiometer (B) so that it corresponds to the appropriate value for the ambient temperature.


Ambient temperature in'C Voltage in V

10 1.75

12 1.80

14 1.85

16 1.90

18 1.95

22 2.05

24 2.10

26 2.15

28 2.20

30 2.25

32 2.30

34 2.35

36 2.40

38 2.45

40 2.50

42 2.55

44 2.60

46 2.65

Functional check

Switch on seat heating for approx. 10 sec. with maximum heating power. After switching off, measure the voltage at the control unit. The value measured now must be considerably higher.

Calibrating controllable seat heating J

Printed in Germany - VIII, 1993


The assembly operations on the air conditioning system as of MY '92 are described in the Repair Manual of the 944 model, Vol. Ill, Repair Group 87. Refrigerant R 12 up to MY '92 Refrigerant R 134a as of MY '93

Air Conditioning

Technical data of air conditioning system as of MY '93 87 - 1

Pressure and temperature specifications 87 - 3

Radio, Telephone, In-board Computer

Removing and installing antenna 91 - 1

Exterior Lights, Lamps, Switches, outside

Adjusting the pop-up headlight mechanical system 94 - 1

Checking headlight beam adjuster 94-5

Instruments, Fuel Gauge, Alarm System

Diagnosis / troubleshooting alarm system D90 -1

Technical data of air conditioning system As of MY '93

Refrigerant charge 860 g refrigerant R 134a

Refrigerant oil in compressor 120 ± 20 c.c. ND 8

Tightening torques for refrigerant lines

Outside thread dia.


Tightening torque, Nm (ftlb.)


18 UNF

17 ±3 (13 ±2)


16 UNF

24 ±4 (18+3)

Hexagon head bolts


Tightening torque, Nm (ftlb.)

Evaporator Compressor

Pressure switch to refrigerant line 3 Nm (2 ftlb.) Note

When fitting the refrigerant line, coat the fittings and O-rings lightly with refrigerant oil. The refrigerant oil must be disposed of as hazardous waste.

Technical data of air conditioning system Printed in Germany - XII, 1994

Pressure and temperature specifications

Refrigerant R 134 a

General testing requirements:

- V-belt tensioned correctly.

- Magnetic clutch energized. -Condenser clean.

- Sunroof, doors and windows closed bar

Ambient temperature

High pressure in refrigerant circuit vs. ambient temperature

1. Switch on A/C system.

2. Set temperature selector to max. cooling.

3. Set fresh-air blower to stage 4.

The pressures and temperatures indicated in the below diagrams must be reached after a running time of approx. 10 min and at a speed of 2,000 rpm with the compressor switched on.

Pressure and temperature specifications Printed in Germany - VIII, 1993

Ambient temperature

1353- 87

Ambient temperature

1353- 87

Low pressure in refrigerant circuit vs. ambient temperature

Temperature at center nozzle

Ambient temperature

1354- 87

Ambient temperature

1354- 87

Air temperature at center nozzle vs. ambient temperature

Pressure and temperature specifications Printed in Germany - VIII, 1993

Radio, Telephone, ln-board Computer

Removing and installing antenna

Vehicles with sun roof

1. Take out sun roof.

2. Remove cover.

Right Angle Drainer For Roof

3. Cut out roof liner in antenna area at right angles to the direction of travel at a length of approx. 15 cm.

Vehicles without sun roof

1. Open rear cover.

2. Remove upper section of weatherstrip of rear cover.

3. Detach roof liner in spotweld flange area.

4. Disconnect connector.


5. Undo screw connection of antenna wire.

6. Undo mounting nut with double socket (17 mm A/F).


Adjusting the pop-up headlight mechanical system


The installed pop-up headlight assembly is comprised of:

1. Sheetmetal console; fitted to body

2. Joint rod; provides link between return lever and rotary support

3. Mounting saddle of electric motor

4. Headlights with hood

5. Rotary support

6. Electric motor with deflection lever

7. Cover ring

The headlight position with regard to the fender aperture is adjusted with the headlight folded down:

1. In longitudinal axis of the vehicle: at the console.

Porsche Seat RepairBlaze Monter Machine

Adjust the headlight in such a manner that the upper edge of the headlight does not protrude above the fender contours and that the headlight is centered with regard to the fender aperture. Make sure the left-hand and right-hand headlights are adjusted in the same way.

Headlight assembly is removed 824-94B

2. In lateral axis of the vehicle: across the headlight.

Headlight assembly removed 825-84


3. in vertical direction: across the rotary support.

Headlight assembly removed B2s-&

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