luggage compartment. ⇒
-top-, ⇒ Workshop Manual '978409
Loosening and securing fuse box in
the luggage compartment'
1
2
3
4

2.3.2

Release fuse holder H (strip B –
white) and connect the lines (RD/GN
Þ Figure 9
and RD/YE) as follows (⇒
-Bottom-):
•
•

2.3.3
2.3.4

– Fuse holder H (strip B –
white)
– Cover on underside
– Latch on fuse holder
– RD/GN line 2,52

Chamber 6: RD/GN line 2.52
Figure 9
⇒ Preparation for connector B,
chamber 1 (swivel motor)
Chamber 7: RD/YE line 2.52 ⇒ Preparation for connector B, chamber 6 (charge
line)

Lock connector housing strip B (color: white) and install it into the fuse holder.
Install fuse holder H (strip B – white) in the fuse box in the luggage compartment.

⇒ Workshop Manual '978409 Loosening and securing fuse box in the luggage
compartment'

2.3.5

Route RD/GN and RD/YE lines to
connector B (preparation). ⇒ Figure
10
1
2
3

– RD/GN and RD/YE lines
– Connector B (preparation)
– Fuse box in luggage
compartment

Release connector B, connect lines
RD/GN and RD/YE as described in
Þ Figure 10 -MagnifierStep 2.3.2. ⇒
Lock connector B.

Tequipment

Figure 10

Jan 26, 2026
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6

Cayenne (9YA)
6690

ENU

Installation and Conversion Instructions

11/23

2.4

Install trailer hitch control unit in the luggage
compartment area (left side panel). ⇒ Figure
11
1
2
3
4

– Trailer hitch control unit bracket
– Connector A - Wire harness for trailer
hitch
– Ground line 2.52 – BN
– Ground pin MB25

2.4.1

Disconnect any lines and hoses in the
installation area.

2.4.2

Insert pins (2 x on underside of
Þ Figure 11 -Acontrol unit bracket) into the body. ⇒

2.4.3

Þ
Clip trailer hitch control unit bracket at the top into the web plate on the body. ⇒
Figure 11 -B-

2.4.4

Guide connector A (wire harness for trailer hitch) and connector B/C (trailer hitch
preparation) into the control unit bracket.

2.4.5

Install the trailer hitch control unit in
the bracket (⇒ Figure 12).
1
2

Figure 11

– Trailer hitch control unit
– Holder

Figure 12

Jan 26, 2026
Page 8 of 13

Tequipment

Installation and Conversion Instructions
2.5

Cayenne (9YA)
11/23

ENU

6690

6

Install cable ring eyelet A6 at the ground pin
Þ Figure 13 -2MB25. ⇒
1
2
3
4
5
6

– Ground line BN 2,52
– Ground pin MB25
– Connector A (Wire harness for trailer
hitch)
– Connector B (preparation)
– Connector C (preparation)
– Trailer hitch control unit

Tightening torque 9 Nm (6.6 ftlb.)
2.6

Connect plug connections for connector A / B /
C to the trailer hitch control unit (⇒ Figure 13).

2.7

ONLY for Trailer hitch – mechanical (1D6):.
2.7.1

Figure 13

Connect plug connection (2-pin
⇒ Figure 14) for brake booster
preparation in the luggage
compartment area at the left.
1
2
3

– Connector (2-pin) – brake
booster preparation
– Connector A
– Ground line BN 2,52

Install connection point at a suitable
location using a scraper clip.
Figure 14
2.7.2

Affix sticker showing the warning
“Electric Brake for Trailer not
connected” on a clean surface at
a clearly visible position next to
the “Ball Position” sticker or the
dashboard (⇒ Figure 15).
1
2

– “Electric Brake for Trailer
not connected” warning
sticker
– “Ball Position” sticker
Figure 15

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6

Cayenne (9YA)
6690

ENU

11/23

2.8

Check fuse assignment in fuse holder H (strip B
– white ⇒ Figure 16) and insert missing fuses
if necessary:
•
•
•
•

3

Coding:

4

Installation and Conversion Instructions

Fuse slot 5 = 25 A – trailer hitch (control
unit, right lighting)
Fuse slot 6 = 30 A – trailer hitch (pivot
motor)
Fuse slot 7 = 20 A – trailer hitch
(attaching trailer & electric release)
Fuse slot 9 = 20 A – trailer hitch (plug
socket)

Follow-up actions

Figure 16

3.1

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

3.2

Install the rear bumper. ⇒ Workshop Manual '635519 Remove and install rear bumper'

3.3

Lower the vehicle. ⇒ Workshop Manual '4X00IN Raising the vehicle'

Coding/programming trailer hitch (1D6 or 1D3 / 1D9)
4.1

Preliminary work – 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

•

Malfunctions in control unit, even during programming

Þ
⇒

Prior to disconnecting the control unit, switch off ignition and remove ignition key.

Þ
⇒

Ensure that the power supply is not interrupted during programming.

Þ
⇒

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

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

Jan 26, 2026
Page 10 of 13

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

Tequipment

Installation and Conversion Instructions
Þ
⇒

Cayenne (9YA)
11/23

ENU

6690

6

During control unit programming, always connect the PIWIS Tester to the vehicle communication
module (VCI) via the USB cable.
4.1.1

Connect P90999 - P90999 - PIWIS Tester 4 to the vehicle and switch it on.

4.1.2

Switch on ignition AND hazard warning lights on the vehicle.
Information
The PIWIS Tester 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
additional information may appear on the PIWIS Tester.

4.1.3

Select the “Diagnostics” menu item on the PIWIS Tester.

4.1.4

If P90999 - P90999 - PIWIS Tester 4 is connected correctly, a connection to the
vehicle will be established: “Cayenne” model line is detected.

4.1.5

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

4.1.6

Question: “Should an FAP be created?” If “Yes”, press •F12“ to confirm.

Information
The function is ONLY available when the Tester is online!
4.2

Enter the new vehicle equipment in the vehicle data using “PIWIS Online”
4.2.1

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

4.2.2

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

4.2.3

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

4.2.4

Look for the option “HITCH DEVICE” in the “Family” column.
Select the available option from the drop-down menu in the “Value” column,
depending on the option installed:
•

1D6 – TRAILER HITCH W/O BALL JOINT (USA)

Press •F12“ to continue.
4.2.5

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

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Cayenne (9YA)
6690

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Installation and Conversion Instructions

11/23
4.2.6

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

4.3

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.
4.3.1

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

4.3.2

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

4.3.3

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

66 90 23 00:

4.4

Only for vehicles with Lane Change Assist (6I2 / 6I5 / 6I6 / 7Y1):
Calibrate Lane Change Assist control unit. ⇒ Workshop Manual '917025 Calibrating Lane
Change Assist'

4.5

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

4.6

Create another vehicle analysis log (VAL) in the “Overview” menu item.

4.7

Switch off ignition and disconnect P90999 - P90999 - PIWIS Tester 4.

4.8

Drive the vehicle off the lifting platform.

–Retrofitted - mechanical - trailer hitch–
Includes:
Removing and installing side trim panel for rear luggage
compartment;
Removing rear bumper and installing trailer hitch;
Make a cut-out for the removable ball hitch in the rear apron;
Code/program the new vehicle equipment(s).

Labor time: 294 TU

ONLY for vehicles with Lane Change Assist / Lane Keep Assist (6I2 / 6I5 / 6I6 / 7Y1):
91 70 25 53: Program Lane Change Assist control unit;
Includes:
Measure calibration plate on the vehicle.

Jan 26, 2026
Page 12 of 13

Tequipment

Labor time: 47 TU

Installation and Conversion Instructions

Cayenne (9YA)
11/23

ENU

6690

6

ONLY for vehicles with painted wheel arch extensions (6GK) or Carbon Design package (2D3) or SportDesign
package (2D5):
51 01 71 05: Body paint finish prepared
Includes:
Order-related
Painting of new parts, step 1
Plastic part

Labor time: 130 TU

66 45 61 51: Rear wheel cover (1x) Painting new part

Labor time: 40 TU

66 45 61 51: Rear wheel cover (1x) Painting new part

Labor time: 40 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.

© 2026 Porsche Cars North America, Inc.

Tequipment

Jan 26, 2026
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