Trailer hitch control unit
Insulating tape
Tie-wrap

Figure 20
3.4.2

Route wire harness for switch
along the existing wire harnesses
as follows to the right side of the
luggage compartment ( Figure
21):
1
2
3

– Wire harness for switch
– Luggage rail (left)
– Tie-wrap

Trailer hitch control unit → under
luggage rail (left) → rear closing
panel → under luggage rail (right)
→ side panel (right)
3.4.3

Oct 8, 2019
Page 12 of 17

Figure 21

Secure electric wire harness in the passenger compartment to existing
lines/components with tie-wraps without tensile stress and so that no chafing
occurs.

Tequipment

Installation and Conversion Instructions
3.5

Cayenne (9YA)
29/18

ENU

6690

6

ONLY for vehicles with air suspension with levelling system and vertical adjustment (1BK):
Adapt new connector housing (12-pin, electric wire harness for trailer hitch) for new switch
for trailer hitch/rear lowering.
3.5.1

Release connector (12-pin) on vehicle side for switch for rear lowering (1BK) (see
also  Figure 22).

3.5.2

Release new connector (12-pin,
switch for trailer hitch – 1D3/1D9
and rear lowering (1BK) ( Figure
22).
Unpin BK/YE line from chamber 6
(light on switch) and secure it.

Figure 22

3.5.3

Unpin lines on the connector
(12-pin) on vehicle side from
chambers 1–6 and pin them at the
same position in the new connector
(12-pin) ( Figure 23 -B-).
A
B

1
2
3
4
5
6
3.5.4
3.6

– Connector (12-pin) –
switch for rear lowering
– Connector (12-pin) –
switch for trailer hitch/rear
lowering
– YE/CY – Up
– WH/VT - redundant level
– GN/BK – Down
– BU/CY – function test on
level LED
– BN/YE – ground
– CY/BU – light on switch

Figure 23

Lock new connector (12-pin).

ONLY for vehicles with standard springs/chassis (1BA):
Make cut-out for trailer hitch switch in side trim panel (right).

Tequipment

Oct 8, 2019
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6

Cayenne (9YA)
6690

ENU

Installation and Conversion Instructions

29/18
3.6.1

Mark dimensions for cut-out (trim on
trailer hitch switch) on the inside of
the side trim panel (right).
1
2
3

– Side trim panel (right)
– Cut-out
– Trailer hitch switch trim

Information
Mask the sawing area to prevent
damage.
Figure 24

3.6.2

Carefully make a cut-out at the
marking ( Figure 24 -A-).

3.6.3

Smooth off cut edges with scissors or a knife.

3.6.4

Clip trim for switch into side trim panel (note installation position of –side guide– 
Figure 24 -B-).

3.7

ONLY for vehicles with Surround Sound System (9VJ/9VL):
Install subwoofer (  Workshop Manual '913619 Removing and installing subwoofer
(Burmester)' or  Workshop Manual '913619 Removing and installing subwoofer (Bose)').

3.8

Install side trim panel for luggage compartment (at the right)  Workshop Manual '700319
Removing and installing side trim panel for rear luggage compartment'.

3.9

Connect plug connection for switch for trailer hitch or switch for trailer hitch/rear lowering.
Install switch in side trim panel for luggage compartment (at the right).

4

Concluding work
4.1

Install side trim panel for luggage compartment  Workshop Manual '700319 Removing
and installing side trim panel for rear luggage compartment'.

4.2

Install rear apron (  Workshop Manual '635519 Removing and installing rear apron')

4.3

Lower the vehicle (  Workshop Manual '4X00IN Lifting the vehicle')

Coding:

NOTICE
Voltage drop
•

Risk of irreparable damage to control unit

•

Risk of damage to control unit

•

Fault entries in the control unit

•

Coding in the control unit is aborted

Oct 8, 2019
Page 14 of 17

Tequipment

Installation and Conversion Instructions

Cayenne (9YA)
29/18

ENU

6690

6

•

Malfunctions in control unit, even during programming



Switch off the ignition and remove the ignition key before disconnecting the control unit.



Ensure that the power supply is not interrupted during programming.



Connect a battery charger with a current rating of at least Nominal value 90 A to the vehicle battery.
5

Coding/programming trailer hitch (1D6 or 1D3/1D9)
5.1

Preparatory work – Coding

NOTICE
Control unit programming will be aborted if the Internet connection is unstable.
•

An unstable Internet connection can interrupt communication between PIWIS Tester
III and the vehicle communication module (VCI). As a result, control unit programming
may be aborted.



During control unit programming, always connect PIWIS Tester III to the vehicle
communication module (VCI) via the USB cable.
5.1.1

9900 - PIWIS Tester 3 must be connected to the vehicle and switched on.

5.1.2

Switch on ignition AND hazard warning lights on the vehicle.

Information
The 9900 - PIWIS Tester III instructions take precedence since the description
may be different with later Tester releases.
The procedure described here has been structured in general terms; different text
or additions may appear on the 9900 - PIWIS Tester III.
5.1.3

Select the "Diagnostics" menu item on the PIWIS Tester.

5.1.4

If 9900 - PIWIS Tester 3 is connected correctly, a connection to the vehicle will be
established: "Cayenne" model line is detected.

5.1.5

Press •F12“ to go to the control unit search screen.

5.1.6

Confirm the question: "Create vehicle analysis log (VAL)?" with "Yes" = •F12“.

Information
The function is ONLY available when the Tester is online!
5.2

Enter the new vehicle equipment in the vehicle data using "PIWIS Online"
5.2.1

Press •F7“ in the control unit overview to switch to the “Additional menu”.

5.2.2

Select the function "Maintenance of vehicle data with PIWIS ONLINE".
A message appears informing you that the "Actual" (vehicle) data and "Required"
(PIWIS Online) data will be compared.
Press •F12“ to continue.

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6

Cayenne (9YA)
6690

ENU

Installation and Conversion Instructions

29/18
5.2.3

Confirm the message "The vehicle data was compared with PIWIS Online.
Significant differences were found" with •F12“.

5.2.4

Look for the option "TRAILER HITCH" in the "Family" column.
Select "1D6 – TRAILER HITCH WITHOUT TOW BALL (USA)" or "1D9 – EL.
RETRACTABLE TRAILER HITCH (E3)", depending on the installed option, from the
drop-down menu in the "Value" column. Press •F12“ to continue.

5.2.5

A table containing the coding value and the columns "new value" and "old value" is
displayed in the overview. Press •F8“ to continue.

5.2.6

Data is then written/stored. The following messages appear one after the other:
•
•
•
•

5.3

Transferring vehicle data to PIWIS Online.
Writing and transferring vehicle data to the vehicle.
Vehicle order was written successfully.
A check was performed in order to check whether control units have to be
coded or programmed as a result of the changes that were made.

Code/program the new vehicle equipment.
5.3.1

Confirm the table containing a list of control units that must be coded/programmed
by pressing •F12“.

5.3.2

Individual data records will be loaded, depending on the number of control units to
be coded/programmed.
Wait until the message "Creating backup documentation. Please wait..." and
"Coding was completed successfully" appears. Press •F12“ to continue.
Repeat the process for other control units if necessary.

5.3.3

Wait until the message "Adaptation of the control units is complete." appears and
check the coding status of the control units in the table that is displayed.
Continue by pressing •F12“ to return to the control unit overview.

5.4

ONLY for –electric– trailer hitch (1D3/1D9):
Initialise trailer hitch control unit and perform function test
5.4.1

Select "Trailer hitch" in the control unit overview and switch to the "Drive
links/checks" menu.

5.4.2

Select "Mechanics" and then "Trailer hitch calibration". Press •F12“ to continue.

5.4.3

After the warning message appears, press •F12“ to continue.

5.4.4

Start the routine with •F8“.
The ball hitch of the electric trailer hitch is fully extended and retracted again.

Oct 8, 2019
Page 16 of 17

5.4.5

Once the successful "Routine status" is displayed, press •F11“ to return to the
control unit overview again.

5.4.6

Carry out function test(s) on the "trailer hitch" switch and "rear lowering" switch if
necessary.

Tequipment

Installation and Conversion Instructions

Cayenne (9YA)
29/18

ENU

6690

6

5.5

ONLY for vehicles with Lane Change Assist (7Y1/7Y2/7Y3 or 7Y8):
Calibrate control unit for Lane Change Assist (  Workshop Manual '917025 Calibrating
Lane Change Assist')

5.6

Read out the fault memories of all systems, work through any existing faults and erase the
fault memories.  Workshop Manual '0335IN Diagnostic maintenance: diagnostic system
and maintenance inter…'

5.7

Create another vehicle analysis log (VAL) in the "Control unit overview" menu item.

5.8

Switch off ignition and disconnect 9900 - PIWIS Tester 3.

5.9

Drive the vehicle off the lifting platform.

66 90 23 00:

–Retrofitting –mechanical– trailer hitch–
Includes:
Removing and installing rear apron and left side trim panel for
rear luggage compartment;
Removing rear bumper and installing trailer hitch;
Making cut-out for removable ball hitch in rear apron;
Coding/programming new vehicle equipment.

91 70 25 53:

Programming Lane Change Assist control unit
Includes:
Calibrating calibration plate on the vehicle.

Labor time: 238 TU

Labor time: 47 TU

Important Notice: Technical Bulletins issued by Porsche Cars North America, Inc. are intended only for use by professional automotive technicians who have attended Porsche service training
courses. They are written to inform those technicians of conditions that may occur on some Porsche vehicles, or to provide information that could assist in the proper servicing of a vehicle. Porsche special
tools may be necessary in order to perform certain operations identified in these bulletins. Use of tools and procedures other than those Porsche recommends in these bulletins may be detrimental to the
safe operation of your vehicle, and may endanger the people working on it. Properly trained Porsche technicians have the equipment, tools, safety instructions, and know-how to do the job properly and
safely. Part numbers listed in these bulletins are for reference only. The work procedures updated electronically in the Porsche PIWIS diagnostic and testing device take precedence and, in the event of a
discrepancy, the work procedures in the PIWIS Tester are the ones that must be followed.

© 2019 Porsche Cars North America, Inc.

Tequipment

Oct 8, 2019
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