in the area of the OBD plug socket.
1
2
3.2

– Connection plug for brake
booster
– OBD plug socket

Connect CAN line.
Figure 9

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3.2.1

Þ
Pick up the CAN signal on plug A (⇒
Figure 10 -1-) from the rear-end
electronics control unit (J393) at the
rear left.
1
2
3
4
5

– Rear-end electronics
control unit (J393)
– Plug connection ground &
brake booster
– Trailer tow hitch control unit
– Plug connection to trailer
tow hitch
– Ground

Figure 10

To do this, expose the CAN bus cables (A51 Orange/Brown & A52 Black/Black) and
crimp together with the supplied cable using a bumper connector as a splice. Slide
shrink-fit hose over the splice and shrink the hose to make it water-tight using a
hot-air gun.
Route the supplied cable on the main
wiring harness to the installation
connector and plug socket contacts
into the standard socket housing.
⇒ Figure 11

Figure 11
Plug for trailer preparation

Chamber

Function

Black/Red line

1

Term. 15

Brown/White line

2

BLS

Black line

3

CAN High

Orange/Brown line

4

CAN LOW

Blue/Green line

6

Brake booster

3.3

Fit trailer tow hitch control unit and connect it.
3.3.1

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Þ Figure 10 -3Fit rear left control unit holder. ⇒

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3.3.2

Þ
Connect plug connections (⇒
Figure 12 -2-) to the trailer tow
Þ Figure 12 -1-).
hitch control unit (⇒
Þ Figure
Establish plug connection (⇒
12 -3-) for ground connection &
brake booster.

3.3.3

Clip the trailer tow hitch control unit
into the control unit holder.

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6690

6

Follow-up actions
4.1

Create cut-out for trailer tow hitch in bumper.

Figure 12

Figure 13
4.1.1

Mark cut-out with a marker. ⇒ Figure 13
Information
Mask the sawing area to prevent damage here.

4.1.2
4.2

Make cut-out using a drill and saw.

Passenger compartment
4.2.1

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

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4.3

4.4
Coding:

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4.2.2

Install rear luggage compartment trim panel (support). ⇒ Workshop Manual
'70061905 Removing and installing rear luggage compartment trim panel (support)'

4.2.3

Install cover for rear lock support. ⇒ Workshop Manual '70391905 Removing and
installing cover for lock carrier (rear)'

4.2.4

Install rear luggage compartment trim panel. ⇒ Workshop Manual '70061900
Removing and installing rear luggage compartment trim panel'

Outside area
4.3.1

Install rear bumper. ⇒ Workshop Manual '635019 Removing and installing rear
bumper'

4.3.2

Install rear trim. ⇒ Workshop Manual '635519 Removing and installing rear trim'

4.3.3

Install tail lights. ⇒ Workshop Manual '943119 Removing and installing tail light in
rear light'

4.3.4

Install rear wheel extension. ⇒ Workshop Manual '664519 Removing and installing
rear wheel cover'

4.3.5

Install rear wheel housing liners. ⇒ Workshop Manual '536919 Removing and
installing rear wheel housing liner'

4.3.6

Install wheels on rear axle. ⇒ Workshop Manual '440519 Removing and installing
wheel'

Connect the battery. ⇒ Workshop Manual '2706IN Information on vehicle electrical system
battery working instructions after disconnecting'

Observe preconditions for control unit programming
Basic instructions and procedure for control unit programming using the PIWIS Tester information'

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6

Information
Vehicle update – general information
The entire vehicle network will be checked for a necessary update or computed to ensure fault-free
functioning of the vehicle. For this purpose, the following preparations are to be made:
•

Latest release on PIWIS Tester 4 and PiUS available

•

Vehicle is fully built up

•

VCI and PIWIS Tester 4 must be connected to each other via workshop Wi-Fi

•

The user must be logged in to the PIWIS Tester 4 in the PPN

•

Vehicle must be supported with an external charger

•

Seat heating and seat ventilation are not active

•

Place the original hand-held transmitter in the emergency start tray (see Workshop Manual)

The vehicle performs the update independently. The current status can be retrieved on the diagnostic
tester or on the front display and control panel (R238) under Messages (RPC+). During the update,
all displays in the vehicle (instrument cluster, central display and passenger display) are occasionally
switched off. The programming process is still ongoing at these times. During the update, a buzzing of
the acoustic simulator will sound several times. This noise is normal and indicates an ongoing update of
the main control unit for the drive and chassis (HCP1).
NOTICE
Sitting inside the vehicle during the update
•

Update cancelled by automatic ignition activation

Þ
⇒

Avoid sitting inside the vehicle during the update.
NOTICE

The specified update process was not followed
•

Update cancellation

•

Destruction of control units

Þ
⇒

Observe and follow the procedures displayed for the update and instructions for the PIWIS Tester

Þ
⇒

Do not replace ignition without instructions from PIWIS Tester

Þ
⇒

Repeat the programming only if a failed update is displayed on the PIWIS Tester

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Information
An active Internet connection with the PIWIS Tester must be ensured.
The technician must log in to PPN with the PIWIS tester.
The PIWIS Tester must not be charged using the cigarette lighter.
NOTICE
Control unit programming will be aborted if the Wi-Fi connection is unstable.
•

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

Þ
⇒

During control unit programming, always connect the PIWIS Tester to the vehicle communication module (VCI) via
the USB cable.
5.1

5.2

Start diagnostics.
5.1.1

•F7“ select additional menu.

5.1.2

Confirm the displayed query for creating a vehicle analysis log (VAL) with "Yes".

5.1.3

Cancel the automatic integration test by pressing •F11“.

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

Select the "Maintenance of vehicle data with PIWIS ONLINE" function in the "Model
series-specific tests and campaigns" menu item.
A message appears informing you that "Actual" (vehicle) and "Target" (PIWIS Online)
data will be compared.
Press •F12“ to continue.

5.2.2

Confirm information "The vehicle data was synchronised with PIWIS Online.
Significant differences were found" by pressing •F12“.

5.2.3

Look for the option "TRAILER HITCH" in the "Family" column.
Select the value "1D6 - Trailer tow hitch without ball joint (removable)" in the
drop-down menu. Press •F12“ to continue

5.3

5.2.4

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

5.2.5

Vehicle data is written and transferred to the vehicle.

5.2.6

The vehicle data log can be created with •F14“. Check that the selected vehicle
equipment has been entered and close the log.

Program and code control units (campaign)
5.3.1

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Press •F3“ to start the integration test in the control unit overview.

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6

5.3.2

After the necessary update has been calculated, confirm the table of the listed control
units, which must be coded/programmed, by pressing •F8“.

5.3.3

Wait for information "The update was successful." and check the coding status of the
control units in the displayed table.
Continue by pressing •F11“ to return to the control unit overview.

5.3.4

After software update is complete, perform a vehicle bus idle.
•
•
•
•

Go back to the control unit overview.
End the vehicle’s operational readiness (ignition off).
Wait for 5 minutes with the driver door open.
Restore operational readiness (ignition on).

Read out the fault memory of all systems, work through any existing faults and erase
the fault memory.

66 90 23 44:

5.4

Create a vehicle analysis log (VAL) in the "Overview" menu item.

5.5

Exit the diagnostic application. Switch off ignition and disconnect P90999 - P90999 - PIWIS
Tester 4.

5.6

Disconnect the battery charger. Information on vehicle electrical system battery working
instructions after disconnecting'

–Trailer tow hitch without ball joint (1D6) installed–
Includes:
Remove and install rear apron, connect wiring harness, install and
code trailer tow hitch without ball joint (1D6).

Labor time: 371 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.

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