Removing and installing driver airbag unit

1. Disconnect battery and cover battery or battery terminal, respectively.

2. Undo fastening screws (2 ea.) with a Torx T 30 socket screwdriver.

Hho Dry Cell Plan
1714-68

Note

Replace the self-locking nuts whenever they have been released, undoing the retaining plate of the airbag unit (4 screws) in the steering wheel.

3. Pull off connector.

Lock Plate Torque Converter
1715-68

Note

When stowing away the airbag unit, make sure the padded side faces up.

The airbag unit must be stored in a safe place when it remains removed for longer periods. Observe safety precautions.

Tightening torque for fastening screws (two M 6x16 screws): 10 Nm (7 ftlb.)

Tightening torque for retaining plate (four M 5x20 screws): 5 Nm (3.5 ftlb.)

68 66 19 Removing and installing contact unit

1. Remove airbag steering wheel (refer to

5. Pull out and disconnect connectors. Take

2. Undo and lift off trim cover.

Porsche 964 Airbag Steering Wheel

1717-68

To avoid inadvertent rotation of the contact unit after the steering wheel has been removed, the contact unit locks automatically when the steering wheel is pulled back. In the same manner, the contact unit is released automatically when the steering wheel is in-

6. Set the front wheel to the straight-ahead position before refitting the contact unit.

7. Make sure the contact unit is kept exactly in the center position (arrows).

1717-68

3. Release contact unit fastening screws.

1721-68

993 Ignition Position
1718-68

1721-68

4. Take out heating and air conditioning control with Special Tool V160 and release tie-wraps of connectors.

68 63 19 Removing and installing airbag triggering unit

The airbag triggering unit must not be removed with the connector remaining connected. When working on the airbag system, allow a waiting time of at least one minute after switching off the ignition (disconnecting the battery) and removing the connector. The triggering unit is located on the transverse wall above the center console.

1. Disconnect battery and cover terminal or

2. Working from the passenger side, flip clamp open. Pull connector off the triggering unit.

3. Undo shear nut with Special Tool 9259.

Porsche 993 Heater Control Panel
281-68

1716-68

4. Working from the driver's side, undo both shear nuts with Special Tool 9259 and take

The mounting locations on the body panel must be cleaned down to bare metal.

Use 1/4 in. hex socket wrench to tighten the

1716-68

68 68 19 Removing and installing passenger airbag unit

1. Disconnect battery and cover terminal or

2. Remove left and right-hand side nozzles.

3. Remove radio and mounting bracket.

4. Remove heater and air conditioning control

One nut and bolt assembly each for the knee protector mounting is located below the mounting bracket and the side nozzles.

5. Remove ashtray.

6. Remove knee protector. Disconnect plug-in

7. Release lower airbag flap (3 screws). Release upper airbag cap (4 screws). After releasing the 4 screws, press flap forward and pull out from below (the flap engages

The hex socket head bolts are micro-sealed. Use new screws when refitting the assembly. Tightening torque: 6 Nm (4 ftlb.)

8. Release airbag unit and pull out from below.

Porsche 993 Airbag
1720-68
Porsche 993 Airbag
1719-68

When stowing away the airbag unit, make sure the airbag opening faces up.

993 Porsche Ignition Unit
1722-68

The airbag unit must be stored in a safe place when it remains removed for longer periods. Observe safety precautions.

68 Checking operational readiness of airbag system

1. Functional check of airbag warning lamp. Switch on ignition. The airbag script must come on for approx. 3 seconds. If the warning lamp does not come on, check bulb

2. Functional check of fault memory. Pull off fuse for voltage supply to clock (fuse No. 18) for approx. 30 seconds with the ignition switched on. The airbag warning lamp must now display a fault. Read out fault and check if fault code 19 (Airbag warning light: Open circuit, fault not present) is displayed.

3. Erase fault memory.

4. Check if no trim parts, decals or other items are attached on the steering wheel and in the area of the passenger airbag.

5. Check components visually for damage and any changes.

6. All checks of the system must be recorded in the stamp areas provided for this purpose in the Warranty and Maintenance brochure.

68 47 19 Removing and installing Cabriolet draft stop

993 Porsche Ignition Unit

1900-68

68 47 19 Removing and installing Cabriolet draft stop

Removing Cabriolet draft stop

Porsche 996 Convertible Latch

68 47 19 Removing and installing Cabriolet draft stop

Removing Cabriolet draft stop

Open convertible top. No. Operation

Instructions

Open zip fastener

Open and disconnect zip fastener of draft stop.

Unlatch drag lever

Unlatch the drag lever from the ball joint mounted on

Remove draft stop

Swing the draft stop until the red marks on the draft stop and the left mount are opposite each other. Press the red button and press the draft stop out of the left mount. Lift the draft stop slightly at the left and pull it

Remove mounts

Remove the fastening screws of the mounts from the

Remove ball joint

Unscrew the bail from the link.

68 47 19 Removing and installing Cabriolet draft stop Installing Cabriolet draft stop

Draft Porsche 993

68 47 19 Removing and installing Cabriolet draft stop

Installing Cabriolet draft stop

Instructions

Install ball joint

Screw the ball to the link. Tightening torque: 5.6 Nm (4 ftlb.)

Install mounts

Position the mounts on the roof frame and screw them to the roof frame using the M 6 x 16 bolts.

Replace bushing

If the dimension X between the installation points of the mounts is up to 1002 mm, the short bushing must be screwed to the right side of the draft stop with a Torx screw. If dimension X is above 1002 mm, the long bushing must be installed. Tightening torque: 15 Nm (11 ftlb.).

Position draft stop

Insert draft stop first into the right mount then into the left mount. Swing the draft stop until the red marks on the draft stop and the left mount are opposite each other. Snap the draft stop into the left mount; a click

Latch in drag lever

Swing the draft stop forwards and latch the drag lever into the ball joint mounted on the link.

Close zip fastener

Insert the part of the zip fastener installed on the draft stop into the half of a zip fastener on the roof liner and close the zip fastener.

68 27 13 Bonding interior rearview mirror in place For vehicles with new mirror generation

The following materials are required to bond the complete interior rearview mirror into place:

Outside Rearview Mirror Glue

1981-68

Cleaning solution (000.043.157.00)* Primer (000.043.158.00)* Cover sheet (000.043.177.01)* Activator (000.043.052.00)* Adhesive (000.043.051.00)*

* Porsche Part No.

68 27 13 Bonding interior rearview mirror in place For vehicles with new mirror generation

Bonding the assembled interior rearview mirror to the windshield

Porsche 993 Rear View Mirror

68 27 13 Bonding interior rearview mirror in place

For vehicles with new mirror generation

Bonding the assembled interior rearview mirror to the windshield

1 Mark position of interior rearview mirror.

Instructions

Mark position of bonding plate on outside of windshield. Dimension A = 597 mm Dimension B = 145 mm

Remove adhesive residue.

Using a scraper, mechanically remove adhesive residue

Using a scraper, mechanically remove adhesive residue from bonding plate of rearview mirror.

Sand bonding plate of interior Using 100 grit sanding paper, mechanically sand rearview mirror to produce bonding plate of interior rearview mirror, a smooth surface.

Clean bonding plate of interior Clean bonding plate of interior rearview mirror rearview mirror. using cleaning solution (A).

Clean bonding area of

Clean bonding area on windshield with cleaning

Mask off bonding area of

Mask off bonding area of windshield with primer template (masking sheet C).

The mark indicating the position of the interior rearview mirror must be visible in the center of the primer template.

Apply primer to bonding area of windshield.

Apply a thin, even coat of primer (B) to masked bonding area of windshield.

Caution: Allow to flash off for 15 to 20 minutes!

No. Operation

5 Activate bonding area on

Instructions

Spray bonding area of windshield with

Remove primer template.

Caution: Allow to flash off for 2 minutes!

Apply adhesive to bonding plate of mirror.

Apply a drop of adhesive (E) to bonding plate of interior rearview mirror.

Bond interior rearview mirror

Press interior rearview mirror with bonding plate onto primered and activated area on windshield.

Note: Press in place for approx. 40 - 50 seconds!

Note:

Bonding strength 60 % after 1 hour 100 % after 24 hours

68 27 19 Removing and installing inside rear view mirror

The following special tool is required for removing and installing the inside rear view mirror:

Tools For Removing Rear View Mirrors
2056 - 68

A = pliers (special tool 9578)

Removing and installing inside rear view mirror

Porsche 993 Rear View Mirror

Removing and installing inside rear view mirror

Removing inside rear view mirror

No. Operation

Instructions

Fix pliers in position

Set pliers to diameter of mirror foot and attach pliers to foot of mirror with projecting plastic parts facing

Loosen mirror

Turn foot of inside rear view mirror 90° using pliers (special tool 9578). Remove pliers from foot of mirror.

Remove mirror

Unclip foot of inside rear view mirror from retaining plate

After removal of the inside rear view mirror from its foot, the small aluminium chip in the locking area must be removed as otherwise it might not be possible to seat the mirror securely when it is fitted. If fitting for the second or third time, check the locking area of the mirror foot for wear and replace the mirror if necessary.

Installing inside rear view mirror

No. Operation

Instructions

Insert mirror

Clip foot of inside rear view mirror, turned 90°, into

Fix mirror in position

Attach pliers (special tool 9578) to foot of mirror with projecting plastic parts facing windshield. Turn the foot of the mirror 90° using the pliers. The mirror must not be turned beyond the locking point.

Remove pliers from foot of mirror.

72 81 19 Removing and installing seat lift units

The following spare parts and special tools are required for removing and installing the seat lift units.

Oscillating Spindle Sander

A = front left and rear right lift unit B = front right and rear left lift unit C = upholstery clip pliers D = upholstery clip

Removing seat and lift units

Automotive Upholstery Clips Supplies Mounting Head Ties Porsche

Removing seat and lift units

No. Operation

Instructions'

Remove rear mounting screws. Move the seat forward up to the stop and unscrew the 2 Remove front mounting screws. Move the seat back up to the stop and unscrew the

Disconnect wiring.

Lift the seat slightly and unplug the connectors. Remove

4 Remove switch cover.

Unscrew the mounting screws of the switch cover.

5 Remove switch console.

Unscrew the mounting screws of the switch console.

6 Remove motor cover.

Using a cross-head screwdriver, unscrew the mounting screws of the cover for the motors.

Disconnect upholstery clips, tensioner wire, tie wraps and electrical connections.

Cut the upholstery clips and tie wraps open on the underside of the seat using secateurs. Unplug the seat heating connector. Disconnect the tensioner wire from

8 Bend metal lugs open.

Bend open the metal lugs on the seat frame and unhook the seat cover.

Disconnect upholstery clips and seat cover.

Cut the upholstery clips between the foam upholstery and the cover open using secateurs. Unclip the cardboard guide on the seat cover from the seat frame and remove the seat cover with the foam part from the seat

No. Operation

Instructions

10 Disconnect lift units at top.

Unscrew the top mounting nuts of the lift units and take

11 Disconnect lift units at bottom.

Unscrew the bottom mounting screws of the lift units from the seat rails and remove the lift units between the seat rail and the seat frame.

12 Remove lift unit from drive shafts. Unclip special spring (retaining spring) between lift unit and drive shaft. Pull lift unit off drive shaft.

13 Remove slides and washers.

Remove the slides and washers from the spindles of

Removing seat and lift units

Porsche 944 Ignition Switch Removal 993 Porsche Airbag Frame

72 81 19 Removing and installing seat lift units

74 28 01 Checking seat heater

1. Remove switch cover (4 screws).

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

3. Switch on ignition.

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

Porsche Airbag Wiring

7. Pijsh button into "off" position and keep it in

8. Turn knurled wheel of potentiometer all the

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

10. Remove seat and connect to Special Tool

11. Switch on seat heater and set to maximum

12. Measure voltage at 2-pin connector

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 button into "on" position and keep it in this position.

Display: approx. 5 V

Porsche Airbag Wiring
1344 - 72

When the seat heater 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 - 1.8 Q

74 27 15 Calibrating controllable seat heater Control unit

Note

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

Installation position

At the bottom of the seat

Porsche Seat Heater Switch

Control unit for seat heater ies - 72

A - Measuring points (V) B - Calibration potentiometer

Tools

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

2. Two measuring probes with a max.

3. Thermometer (as recommended in the

4. Hexagon wrench 2 mm.

5. Two auxiliary wires to supply voltage to the removed seat (terminals 15 and 31).

Calibration procedure

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

2. Provide power supply.

Note

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

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

4. Connect voltmeter to control unit (A).

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

Table

Ambient temperature in°C Voltage in V

10 1.75

12 1.80

14 1.85

16 1.90

18 1.95

20 2.00

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

48 2.70

Functional check

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

Installing lift units and seat

No. Operation

Instructions

1 Adjusting lift units

The spindles of the lift units must be adjusted so that dimension A measured from the head of the unit to the grooves in the spindles is 40 mm.

2 Position washers and slides.

Push the washers and slides onto the spindles of the lift

3 Attach lift units to drive shafts.

Push the lift units onto the drive shafts and clip the special springs (retaining springs) into position between the

4 Attach lift units to bottom mounts.

Push the lift units in between the seat rails and the seat frame. Attach the lift units to the seat rails using the M 6 x 16 hexagonal head self-locking bolts. Tightening

Attach the lift units to the seat rails using the M 6 x 16 pan head screws - and bond them using Loctite 270 -. Tightening torque: 8 Nm (6 ftlb).

At the front, the motor mount must be screwed into place with the same screws.

5 Attach lift units to top mounts.

Place the guide springs on the slides of the spindles. Bond the mounting nuts with Loctite 270 and screw them onto the spindles of the lift units. Tightening torque: 11 Nm (8 ftlb).

6 Test functions of lifting units.

To test the functions of the lift units, install the seat in the vehicle without upholstery or cover. If the lift units stop at different levels at bottom right and left, unclip the special spring (retaining spring) and remove the

No. Operation

Instructions

7 Adjust lift units.

Set the lift unit which lags behind to stop at the same position as the other unit using a rectangular wrench or screwdriver. Push the drive shaft back into position and clip the retaining spring on. Remove the seat from the

8 Install foam upholstery with

Place the cover with foam section in the seat frame. Hook the cardboard guide back into the seat frame. Fasten the cover to the foam section at the back using

Hook in seat cover.

Hook the seat cover to the metal lugs at the bottom of the seat frame and bend the lugs inwards.

10 Attach cover, upholstery and

Attach the seat cover and the foam section to the seat frame using upholstery clips. Tension the tension wire and attach it to the seat frame. Plug in the electrical connector and attach the cable to the seat frame using

11 Install motor cover.

Attach the motor cover to the seat frame using sheet metal screws and washers.

12 Install switch console.

Push the seat cover under the switch console and attach the switch console to the seat frame using countersunk sheet metal screws.

13 Install switch cover.

Fit switch cover to switch console and fix it in place with sheet metal screws and washers.

14 Plug in connectors.

Place the seat in the vehicle, lift it slightly and plug in

15 Position seat on seat rail mount

Place the seat on the seat rail mount at the front and align the bolt holes at the front correctly. Position the bolts and washers at the front.

No. Operation

Instructions

16 Position seat on seat rail mount at the rear. Screw seat into place at front and rear.

Move the seat up to the stop at the front and alighn the bolt holes correctly at the rear. Position the rear bolts with washers and tighten them. Move the seat to the back and tighten the mounting screws at the front. Tightening torque at front and rear: 23 Nm (17 ftlb)

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