Work Procedure 1 - 7.2

Refer to the wiring diagrams.

1 - Move the front seats to rearmost position. Note the radio code and disconnect the battery negative clamp.

2 - Remove the passenger's side foot board.

3 - Remove the old cabrio top control unit and install the new 993 618 313 00 control unit.

4 - Remove and disassemble plug M1. Locate the 1.0 mm red wire (Pin 3, Term 15).

4.1 - Join the additional 0.5 mm red wire (locally obtained) to the existing 1.0 mm red wire (term 15, pin 3) and solder. Insulate the connection with electrical tape.

4.2 - Reassemble plug M1 and reinstall onto the control unit.

5 - Solder the 2.4 mm round connectors onto one end of the additional 0.5 mm brown / white and green / white wires.

6 - Remove plug M2 from the control unit.

6.1 - Install the round connector of the additional brown / white wire into the M2 connector position 1 (term. hd).

6.2 - Install the round connector of the additional green / white wire into the M2 connector position 5 (term. P).

6.3 - Reassemble plug M2 and reconnect into the control unit.

7 - Route the additional 0.5 mm red wire and green / white wire along the under dash and up to the area of the oil pressure/oil temp. gauge. Route the additional wires along the existing harness and secure using cable ties.

7.1 - Pull the oil pressure / oil temperature gauge from the dash panel.

7.2 - Pull the 0.5 mm red / yellow wire connector from the cabrio top control light.

7.3 - Join the additional 0.5 mm red wire to the existing 0.5 mm red / yellow wire and solder (see wiring diagram 7.3). Insulate the connection with electrical tape and reconnect onto the Cabrio top control light terminal.

7.4 - Pull the additional green / white wire through the flat connector housing (999 652 199 40) and crimp the flat male connector (N 017 242 11) onto the end of the wire. Insert the flat connector into the flat connector housing. Connect the additional green / white wire onto terminal G of the oil pressure / oil temperature gauge (see wiring Diagram 7.4).

7.5 - Pull the speedometer from the dash panel. Remove the red / yellow wire on terminal + (plus). Cut off the flat connector. Insulate and tape this wire to the back of the harness.

7.6 - Reinstall the speedometer and oil pressure/oil temperature gauges.

8 - Route the additional brown / white wire along the center tunnel to the area of the shift coupler cover.

8.1 - Remove the shift coupler cover. Locate the wiring harness inside the tunnel and very carefully cut the harness open with a knife.

8.2 - Locate the 0.5 mm brown / white wire (from the hand brake switch) in the harness. Connect the additional 0.5 mm brown / white wire to the existing brown/white wire in the harness and solder. Insulate the connection with electrical tape. Approximately 2 cm from the solder connection and toward the rear of the vehicle, cut the brown / white wire in the harness and install the diode (911 617 106 01). Pay attention to the correct installation position of the diode (see wiring diagram 8.2, page 5). Solder the diode into place and insulate the connections with electrical tape. Close the harness using electrical tape and reinstall the shift coupler cover.

9 - Reinstall the passenger's foot board and related parts. Reconnect the battery, reset the vehicle clock, and recode the radio.

10 - Function test the system.

10.1 - Pull the hand brake lever up.

10.2 - Place the ignition key in position 2 (ignition on or engine running).

10.3 - Open and close the Cabrio top using the control switch.





11 - Ensure that the vehicle owner is aware of the change in operating instructions for the Cabrio top.The changed operating instructions for the owner's manual are found in this bulletin. Copy the page, cut it down to the size of the owner's manual, and insert it into the clear sleeve in the front of the owner's manual.

11.1 - In the vehicle owners manual find the section...." Electrical Operation of Top". Locate the text....." 1. Turn ignition key to ignition lock position 1". Strike out this text with a solid line through the center. At this location in the owner's manual, note the following:

Cabrio top operation changed. Refer to the new information in the front of the owners manual.

11.2 - The abbreviated operating instructions found on page 8 of this bulletin are to be copied, cut down to the correct size, and placed on the back side of the driver's sun visor over the old information.

12 - Discuss the new operating instructions directly with the vehicle owner. Show the customer where the new information can be found in the vehicle and demonstrate the Cabrio top operation.

Labor Information: 210 TU

For the 911 Carrera 2/4 and 911 Turbo M.Y. 1990 through 1994:

Parts information:





The additional parts will be required when installing the 993 618 313 00 control unit into the 911 Carrera 2/4 or 911 Turbo MY. 1990 through 1994: