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WKG8 – Re-coding Airbag Control Unit (Workshop Campaign)

Model line:

911 Carrera (992)

Model Year:

2020

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.

Subject:

Airbag control unit

Situation:

The airbag control unit on the affected vehicles was coded with an incorrect data record.
As a result, the Event Data Recorder (EDR) function is activated although this is not yet approved for the
vehicle type. This function can be used to record certain historical data without the customer's consent in
the event of an accident.

Remedial
Action:

Re-code the airbag control unit using the PIWIS Tester with test software version 38.750.020 (or higher)
installed.

Affected
Vehicles:

Only the vehicles assigned to the campaign (see also PCSS Vehicle Information).

Required Tools
Tools:
Information
The new 911 (992) comes with either a lithium starter battery (I-no. J2A) or an AGM starter battery
(I-no. J0V, J4K) as standard.
This depends on the following:
•

Country version

•

Model type

•

Vehicle equipment

Lithium starter batteries must only be charged using a suitable battery charger that has a current
and voltage-controlled charge map.

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For further information about the battery chargers to be used, see  Workshop Manual '270689
Charging battery/vehicle electrical system'.
•

•

Battery charger with a current rating of at least 90 A and - if required - also with a current and
voltage-controlled charge map for lithium starter batteries, e.g. VAS 5908 - Battery charger
90A
9900 - PIWIS Tester 3 with PIWIS Tester software version 38.750.020 (or higher) installed

Preparatory Work
NOTICE
Fault entry in the fault memory and/or control unit coding aborted due to low voltage.
•

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



Before starting control unit coding, connect a suitable battery charger with a current rating of at least 90 A
to the vehicle.
NOTICE

Coding will be aborted if the WLAN connection is unstable.
•

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



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

Control unit coding will be aborted if the driver's key is not recognised
•

If the driver's key is not recognised in the vehicle, coding cannot be started or will be interrupted.



Place the driver's key with the back facing down in the area in front of the storage compartment under
the armrest (emergency start tray) in order to guarantee a permanent radio link between the vehicle and
driver's key.

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Information
The procedure described here is based on the PIWIS Tester 3 software version 38.750.020.
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.
Work Procedure: 1

Re-code airbag control unit.

NOTICE
Use of a PIWIS Tester software version that is older than the prescribed version
•

Measure is ineffective



Always use the prescribed version or a higher version of the PIWIS Tester software for control unit
coding.
Required PIWIS Tester software version:

38.750.020 (or higher)

Type of control unit coding:

Control unit coding using the 'Automatic coding'
function for the control unit:
Airbag control unit – 'Coding/programming'
menu – 'Automatic coding' function.
Read and follow the information and instructions
on the PIWIS Tester during the guided procedure.

Coding sequence:

Do not interrupt coding.
When coding is complete, the message “Coding has
been completed successfully” is displayed and a tick
appears in the 'Status' box.
Procedure if control unit coding is not
successful:
2

Repeat control unit coding.

Read out and erase all fault memories.
For instructions, see  Workshop Manual '033500 Fault memory for on-board diagnosis'.
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.

3

Enter the campaign in the Warranty and Maintenance booklet.

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Warranty processing
Scope 1:

Working time:
Re-coding airbag control unit
Includes:
Connecting and disconnecting battery charger
Connecting and disconnecting PIWIS Tester

Labor time: 30 TU

Reading out and erasing fault memories
 Damage Code WKG8 066 000 1

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.

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