Service

Technical Information

146/18 ENU

WJ20

4

WJ20 - Replacing PASM Control Unit (Workshop Campaign)

Important:

CRITICAL WARNING -This campaign includes steps where control unit(s) in the vehicle will be
programmed with the PIWIS Tester. The vehicle voltage must be maintained between 13.5 volts and 14.5
volts during this programming. Failure to maintain this voltage could result in damaged control unit(s).
Damage caused by inadequate voltage during programming is not a warrantable defect. The technician
must verify the actual vehicle voltage in the PIWIS Tester before starting the campaign and also document
the actual voltage on the repair order

Model Year:

As of 2017 up to 2018

Model line:

Panamera (971)

Subject:

Control unit for Porsche Active Suspension Management (PASM)

Information:

The PASM control unit can stop working on the affected vehicles after several years of driving.
This is caused by a defective soldered joint.
As a result, the function of the chassis may be impaired and a corresponding warning will be displayed in
the instrument cluster.

Remedial
Action:

Replace PASM control unit.

Affected
Vehicles:

Only the vehicles assigned to the campaign (see also PIWIS Vehicle information). This campaign affects
2,385 vehicles in North America.

AfterSales

Feb 7, 2020
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Service

Technical Information

WJ20 ENU 146/18

Installation
position:

Installation position of PASM control unit

Parts required
Part No.:

Part No.

Designation
– Use

Qty.

00004399031

 PASM control unit
– Vehicles with air suspension (I-no. 1BK)

1 ea.

 PASM control unit
– Vehicles with steel springs (I-no. 1BH)

1 ea.

or
00004399032

Also required for all vehicles except vehicles with equipment combination
fixed luggage compartment cover (I-no. 3U7) and without sun blind (I-no. 3Y0):
9A700794200

Feb 7, 2020
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 Bearing pin

AfterSales

1 ea.

Service

Technical Information

146/18 ENU

WJ20

4

Parts required
Part No.:

Part No.

Designation

Qty.

00004399033

 PASM control unit

1 ea.

Also required for all vehicles except vehicles with equipment combination
fixed luggage compartment cover (I-no. 3U7) and without sun blind (I-no. 3Y0):
9A700794200

 Bearing pin

1 ea.

Required tools
Tools:

•
•

9900 - PIWIS Tester 3
Battery charger with a current rating of at least 90 A, e.g. Battery Charger, 90 A

Replacing PASM control unit
Work Procedure: 1

Observe warning notes for working on the high-voltage vehicle electrical system  Workshop
Manual 'General warning notes for working on the high-voltage vehicle electrical system'.

2

Isolate the high-voltage system from the power supply  Workshop Manual 'Isolating high-voltage
system from power supply/Starting high-voltage system'.

3

Complete the relevant documentation  Workshop Manual 'Test log: Verifying absence of electric
charge'.

4

Remove side trim panel for rear luggage compartment at the left  Workshop Manual 'Removing
and installing side trim panel for rear luggage compartment'.

5

Only for vehicles with subwoofer (I-no. 9VJ or 9VL):
Remove subwoofer  Workshop Manual 'Removing and installing subwoofer'.

6

Disconnect high-voltage charger with coolant lines connected and set it aside.

NOTICE
Coolant hoses kinked or pulled too tightly
•

If the coolant hoses are kinked or pulled too tightly, this can cause lasting damage and leaks in the
cooling system.



Remove and install the high-voltage charger carefully without kinking the coolant hoses or pulling
them too tightly.

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Service

Technical Information

WJ20 ENU 146/18
6.1

Disconnect all electric plug connections on the high-voltage charger and unscrew fastening
screws and nuts. Do not drain the coolant in the low-temperature system and do not
disconnect the coolant hoses while doing this.
For instructions, see  Workshop Manual 'Removing and installing high-voltage charger',
ignoring steps 9 and 10.

6.2

First, tilt the high-voltage charger with holder
 Removing high-voltage charger with holder
-1- and with coolant hoses connected 
Removing high-voltage charger with holder
-2- to the rear  Removing high-voltage
charger with holder -arrow A- and then set
it down carefully with the front side on the
carpeted floor of the luggage compartment
 Removing high-voltage charger with holder
-arrows B-.
Removing high-voltage charger with holder
Set the high-voltage charger  Setting down
high-voltage charger with holder -1- down
on the carpeted floor in such a way that the
coolant hoses  Setting down high-voltage
charger with holder -2- are not strained.

7

Replace PASM control unit.
For instructions, see:
 Workshop Manual 'Removing and installing PASM
control unit'.
 Workshop Manual 'Replacing PASM control unit'

8

Install high-voltage charger  Workshop Manual
'Removing and installing high-voltage charger'.

9

Install subwoofer, if you removed it earlier  Workshop Manual 'Removing and installing subwoofer'.

Setting down high-voltage
charger with holder

10 Install side trim panel for rear luggage compartment at the left  Workshop Manual 'Removing and
installing side trim panel for rear luggage compartment'.
11 Start the high-voltage system  Workshop Manual 'Isolating high-voltage electrical system from
power supply/Starting high-voltage electrical system'.
12 Complete the relevant documentation on commissioning  Workshop Manual 'Test log: Commissioning the high-voltage system'.
13 Commission the PASM control unit  Workshop Manual 'Replacing PASM control unit'.

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AfterSales

Service

Technical Information

146/18 ENU

WJ20

4

14 Calibrate the levelling system  Workshop Manual 'Calibrating the levelling system'.
15 Read out and erase the fault memories of all control units.
15.1

Press •F7“ in the control unit selection screen ('Overview' menu) to call up the Additional
menu.

15.2

Select the function “Read all fault memories
and erase if required” and press •F12“
('Next') to confirm your selection  Erasing
fault memories.
The fault memories of the control units are
read out.

15.3

Once you have read out the fault memories,
check the fault memory entries.
Erasing fault memories
Information
If control units are found to have faults that
are not caused by control unit programming, these must first be found and corrected. This
work cannot be invoiced under the workshop campaign number.

15.4

Press •F8“ to delete fault memory entries.

15.5

Press •F12“ ('Yes') in response to the question as to whether you really want to delete all
fault memory entries.
The faults stored in the fault memories of the various control units are deleted.
Information
If fault memory entries for individual control units cannot be deleted, proceed as follows:
•

Switch off the ignition.

•

Disconnect the PIWIS Tester diagnostic connector from the diagnostic socket.

•

Lock the vehicle using the driver's key.

•

Wait approx. 1 minute before unlocking the vehicle again.

•

Start the engine, leave it running for a short time and then stop it again.

•

Switch off the ignition and wait approx. 10 seconds before switching it back on again.

•

Plug the PIWIS Tester diagnostic connector into the diagnostic socket again and restore
communication with the vehicle.

•

Read out the fault memory again and delete any fault memory entries that are stored.

AfterSales

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Technical Information

WJ20 ENU 146/18
15.6

Once you have erased the fault memories,
select the 'Overview' menu to return to the
control unit selection screen  Control unit
selection.

16 Enter the campaign in the Warranty and Maintenance
booklet.

Control unit selection

Replacing PASM control unit
1

Replace PASM control unit and commission it.
For instructions, see:
 Workshop Manual 'Removing and installing PASM control unit'
 Workshop Manual 'Replacing PASM control unit'

2

Calibrate the levelling system  Workshop Manual 'Calibrating the levelling system'.

3

Enter the campaign in the Warranty and Maintenance booklet.

Warranty processing
Information
The specified working times were determined specifically for carrying out this campaign and include all
required preliminary and subsequent work.