Subject: Cabriolet Top Control Unit  Models: 911 1986-89/1990-02/1994

Bulletin Number: 96 – 13

ATTENTION: Service Manager / Service Technician

Models Affected:             911 Carrera, 911 Turbo, M.Y. 1986 – 89 and 911 Carrera 2/4, M.Y 1990 to 1994 and 911 Turbo, M.Y. 1991, 92 and 94

Concern:                              The Cabrio top control unit is now superceded to the type used in the 911 Carrera (93). The original equipment part for the above mentioned models is no longer available.

General Information:     As a result of the parts supersession, when the 993.618.313.00 control unit is installed, additional wiring work is necessary.

                                                For the 911 Carrera and 911 Turbo M.Y. 1986 through 1989, refer to the wiring diagrams and specific instructions found on this bulletin.

                                                For the 911 Carrera 2/4 and 911 Turbo M.Y. 1990 through 1994, refer to the wiring diagrams and specific instructions found on this bulletin.

Parts Information:           The following additional parts will be required when installing the 993.618.313.00 control unit into the 911 Carrera or 911 Turbo M.Y. 1986 through 1989:

                                            *Locally obtained

Work Procedure:                                         Refer to the wiring diagrams below.

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 brown / white wire into the M2 connector position 5 (term. P).

6.3 – Reassemble pug M2 and reconnect onto 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 diagram 7.3 on page 5). Insulate the connection with electrical tape and reconnect onto the Cabrio top control light terminal.

7.4 – Pull the additional green / white wire through 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, page 5).

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 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) 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 is 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 on the very last page of 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 on 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.

                             The following additional parts will be required when installing the              993.618.313.00 control unit into the 911 Carrera 2/4 or 911 Turbo M.Y 1990 through 1994:

                                                                                  * locally obtained

1 – Move the driver’s seat to the rear most position. Note the radio code and disconnect the battery negative clamp.  

                    4 – Remove plug 1 from the central informer.

4.1 – Join the additional 0.5 mm brown / red wire and the central informer and solder (see diagram 4.1 on the page above). Insulate the connection with electrical tape and   reinstall plug 1 into the central informer.

5 – Reinstall the cabrio top using the control switch.

6 – Reconnect the battery, reset the vehicle clock and recode the radio.

7 – Function test the system.

7.1 – Pull the hand brake lever up.

7.2 – Place the ignition key in position 2 (ignition on engine running).

7.3 – Open and close the cabrio top using the control switch.

8 – Make the vehicle owner aware of the change in operating instructions or the cabrio top. The changed operating instructions are found on the very last page of 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.

8.1 – In the vehicle owner’s 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 owners manual, note the following:

Cabrio top operation changed. Refer to the new information in the front of the owner’s manual.

8.2 – The abbreviated operating instructions found on this page 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.

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

Labor Information:                                                          100 TU

                                                                                Abbreviated cabrio top operating instructions to be copied, cut to size and placed on the back of the driver’s sun visor.

                                                                For 911 Carrera, 911 Carrera 2/4 and 911 Turbo M.Y. 1986 through 1994

To operate convertible roof electrically observe operating instructions.

Operate top only with vehicle at standstill. (ignition key in pos. 2) and the hand brake pulled.

Caution: Drive only with convertible top in final, forward or rear, position (indicator lamp off).

At temperatures below freezing, the rear window must be opened first.

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