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WC26 - Re-programming Rear-differential Lock Control Unit (Workshop Campaign)

Revisions:

September 3, 2013, amends WC26 as follows:
a. PIWIS tester software version changes from 10.800 to 12.600.
b. The programming code that must be entered into the PIWIS tester is M4P5H.
c. Provides additional text under "Carrying out control unit programming" procedure under "Information".
d. Troubleshooting work procedure now has Porsche part numbers 0BN927771F OR OBN927771Y.

Model Year:

As of 2011 up to 2013

Note:

CRITICAL WARNING - THIS CAMPAIGN INCLUDES STEPS WHERE SEVERAL CONTROL UNITS
IN THE VEHICLE WILL BE PROGRAMMED WITH THE PIWIS TESTER. IT IS CRITICAL THAT THE
VEHICLE VOLTAGE BE BETWEEN 13.5 VOLTS AND 14.5 VOLTS DURING THIS PROGRAMMING.
OTHERWISE, THE PROGRAMMING COULD FAIL RESULTING IN DAMAGED CONTROL UNITS.
CONTROL UNITS DAMAGED BY INADEQUATE VOLTAGE WILL NOT BE COVERED UNDER
WARRANTY. THE TECHNICIAN MUST VERIFY THE ACTUAL VEHICLE VOLTAGE IN THE
INSTRUMENT CLUSTER OR IN THE PIWIS TESTER BEFORE STARTING THE CAMPAIGN. IT IS
ALSO ADVISABLE TO MONITOR THE VEHICLE VOLTAGE DURING THE PROGRAMMING VIA THE
INSTRUMENT CLUSTER. PLEASE REFER TO EQUIPMENT INFORMATION EQ-1105 FOR A LIST
OF SUITABLE BATTERY CHARGERS/POWER SUPPLIES WHICH SHOULD BE USED TO MAINTAIN
VEHICLE VOLTAGE.

Vehicle Type:

Cayenne (92A)/Cayenne S (92A)/Cayenne GTS (92A)/Cayenne Turbo (92A)

Equipment:

Porsche Torque Vectoring (PTV Plus) incl. regulated rear-differential lock (I-no. 1Y1).

Concerns:

Rear-differential lock control unit

Information:

This is to inform you of a voluntary Workshop Campaign on the above-mentioned vehicles.
With the current data record for regulating the rear-differential lock, there may be increased
wear on the pinion shaft on the servo motor for the rear-differential lock as a result of extreme
driving over the service life of the vehicle.
This can cause noises and can subsequently impair the function of the rear-differential lock.

Action
Required:

Re-program control unit for rear-differential lock.
Information
It takes about 4 minutes to program the rear-differential lock control unit.

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Note:

PIWIS Tester test software version 12.600 (or higher) must be used to carry out the campaign from now
on. Please note the changed programming code: To program the rear-differential lock control unit using
PIWIS Tester test software version 12.600 (or higher) the programming code M4P5H must be entered."

Affected
Vehicles:

The VIN(s) can be checked by using PIWIS Vehicle Information link to verify if the campaign affects the
vehicle. This Campaign is scope specific to the VIN! Failure to verify in PIWIS may result in an improper
repair. This campaign affects 2,204 vehicles in the North America.

Tools:

9818 - PIWIS Tester II with PIWIS Tester software version 12.600 (or higher) installed.
Battery Charger/Power Supply — Suitable for AGM Type batteries, recommended current rating of 70A,
fixed voltage 13.5V to 14.5V. Refer to Equipment Information EQ-1200 and EQ-1105.

Work
Procedure:

See Attachment “A”.

Claim
Submission:

See Attachment “B”.

Attachment "A"
NOTICE
Fault entry in the fault memory and control unit programming aborted due to low voltage.
•

Increased current draw during diagnosis or control unit programming can cause a drop in voltage, which
can result in one or more fault entries and the abnormal termination of the programming process.



Before commencing work, connect a battery charger or power supply - suitable for AGM Type batteries,
recommended current rating of 70A fixed voltage 13.5V to 14.5V to the jump-start terminals in the engine
compartment.



Disconnect electric plug connection for the fan blower to prevent the blower from coming on during
control unit programming.
NOTICE

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

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



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

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NOTICE
Control unit programming will be aborted if the vehicle key is not recognized
•

If the vehicle key is not recognized in vehicles with Porsche Entry & Drive, programming cannot be started
or will be interrupted.



Switch on the ignition using the original vehicle key. To do this, replace the original vehicle key in the
ignition lock with the plastic key fob if it was previously removed at the start of this procedure.

Work
Procedure:

VEHICLE VOLTAGE MUST REMAIN BETWEEN 13.5 AND 14.5 VOLTS DURING THE ENTIRE WORK
PROCEDURE.
1

Disconnect electric plug connection for the fan
blower  Electric plug connection for fan blower
-1- ( Electric plug connection for fan blower -a-)
to prevent the fan blower from coming on during
control unit programming.
Having the fan on and the associated increased
current draw can cause a drop in voltage, which
can result in abnormal termination of control unit
programming.

Electric plug connection for fan blower
2

Connect a battery charger or power supply, suitable for AGM type batteries, recommended current
rating of 70A fixed voltage 13.5V to 14.5V to the jump-start terminals in the engine compartment.

3

Switch on the ignition using the original driver's key. On vehicles with "Porsche Entry & Drive", do
this by replacing the control panel in the ignition lock with the original driver's key if necessary.

4

9818 - PIWIS Tester II with software version 12.600 (or higher) installed must be connected to
the vehicle communication module (VCI) via the USB cable. Then, connect the communication
module to the vehicle and switch on the PIWIS Tester.

Carrying out control unit programming
Information
The procedure described here is based on the PIWIS Tester II software version 12.600.
The PIWIS Tester instructions take precedence and in the event of a discrepancy, these are the
instructions that must be followed.
A discrepancy may arise with later software versions for example.

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VEHICLE VOLTAGE MUST REMAIN BETWEEN 13.5 AND 14.5 VOLTS DURING THE ENTIRE WORK
PROCEDURE.
1

On the PIWIS Tester start screen, call up the  'Diagnostics' menu and select vehicle type 
'Cayenne'  '92A as of MY 2011'.
The diagnostic application is then started and the control unit selection screen is populated.

2

In the control unit selection screen ( 'Overview'
menu), press •F7“ to call up the  'Additional
menu' ( Control unit selection).

Control unit selection
3

When the question “Create Vehicle Analysis Log (VAL)?” appears, either press •F12“ to create a
VAL or press •F11“ if you do not want to create a VAL.

4

Press •>>“ to acknowledge the message informing you that campaigns for the vehicle are stored
in the PIWIS information system.

5

Select the  'Campaign' function and press
•>>“ to confirm your selection  Additional
menu – Campaign.
You are then prompted to enter a campaign
number.

Additional menu – Campaign

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To enter the campaign number, click in the
relevant text box so that the cursor starts to flash
 Campaign number input field.

Campaign number input field
7

Enter the programming code M4P5H and press "Enter" to confirm.
The text box turns blue.
Press •>>“ to start the guided programming sequence.

Information
Read and follow the information and instructions on the PIWIS Tester during the guided
programming sequence.
Depending on the data record stored on the rear-differential lock control unit, the control unit will be
re-programmed with a new data record with the Porsche part number OBN927771F or OBN927771Y.
(Programming takes approx. 4 minutes.)
Do not interrupt programming.
If programming does not start, the campaign number must be entered again and programming must be
restarted.
If an error message is displayed (e.g. “Campaign does not exist”, “No suitable programming rules found”
or “Vehicle data could not be read”, etc.), please read and follow the appropriate instructions provided
under  Technical Information 'WC2600 Troubleshooting' at the end of this Technical Information.
If programming is interrupted (e.g. due to a voltage drop or if communication is aborted, etc.) or if
programming could not be carried out successfully (error message "Programming unsuccessful"),
programming must be repeated by entering the programming code M4P5H again (Additional
menu>Campaign>>Enter programming code).
It is not possible to program the control units manually.
Once programming is completed successfully (message “Campaign was carried out successfully”), carry
out the Subsequent work described below.

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