122-Z9T3E-12

Service
Technical Information
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ENU
9170
9
Eliminating Symptoms in Body Interior: Re-programming Lane Change Assist Control Unit
(for I-no. 457) (Incorrect or no display/SY1816)
General information
Symptom
The Lane Change Assist indicator integrated in both mirror attachment point finishers for warning the
driver in the near range does not light up or lights up for no reason.
Cause, introduction date and remedial action
Cause
The Lane Change Assist control unit software is not robust enough.
Model Year:
2017
Vehicle Type:
Sports Cars (982/991)
Date of
introduction
From July 25, 2016, Lane Change Assist control units with optimized software are used during
production.
Remedial
action
In the event of a customer complaint, re-program and code Lane Change Assist control units using 9900
- PIWIS Tester III.
Tools
Tools
9900 - PIWIS Tester III
Battery Charger/Power Supply - Suitable for AGM Type batteries, recommended current rating of 90A
fixed voltage 13.5V to 14.5V.
Re-programming Lane Change Assist control units
Re-programming Lane Change Assist control units
NOTICE
Coding will be aborted in the event of low voltage.
•
Increased current draw during diagnosis can cause a drop in voltage, which can result in one or more fault
entries and the abnormal termination of the coding process.
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
Service
9170
ENU
Technical Information
18/16
Before commencing work, connect a suitable battery charge or power supply - suitable for AGM Type
batteries, recommended current rating of 90A fixed voltage 13.5V to 14.5V to the jump-start terminals in
the engine compartment.
NOTICE
Coding will be aborted if the Internet connection is unstable.
•
An unstable Internet connection can interrupt communication between PIWIS Tester III and the vehicle
communication module (VCI). As a result, coding may be aborted.

During control unit coding, always connect PIWIS Tester III to the vehicle communication module (VCI) via
the USB cable.
1
Preliminary work
1.1
Connect a battery charger or power supply, suitable for AGM type batteries, recommended
current rating of 90A fixed voltage 13.5V to 14.5V.
1.2
Switch on the ignition using the original driver's key. On vehicles with “Porsche Entry &
Drive”, do this by replacing the control unit in the ignition lock with the original driver's key if
necessary.
1.3
9900 - PIWIS Tester III must be connected to the vehicle.
1.4
On the PIWIS Tester start screen, call up the  'Diagnostics' menu and select the affected
model line.
The diagnostic application is then started and the control unit selection screen is populated.
2
Re-program and then re-code Lane Change Assist master and slave control units.
2.1
2.2
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select
 Follow instructions:
•
•
2.3
Lane Change Assist master
and
Lane Change Assist slave
Control units
’Overview’
•Yes“/•
No“/
•F12“
Create Vehicle Analysis Log (VAL) if necessary and
carry out any campaigns that are available for the
vehicle.
Automatic
programming
‘Programming’
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•F12“
select
•F8“
Service
Technical Information
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ENU
9170
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Read and follow the information and instructions on the PIWIS Tester during the guided
programming sequence. Then press •>>“ to continue.
Do not interrupt programming.
Once control unit programming is complete, you will be prompted to switch the ignition off
and then back on again after a specified waiting time.
2.4
2.5
Control units
’Overview’
Lane Change Assist
master
and
Lane Change Assist slave
'Extended identification'
Software version programmed during this
campaign
select
•F12“
select
•F12“
0160
If programming is not completed successfully (error message “Programming unsuccessful”), programming must be repeated.
2.6
3
'Codings/adaptations'
Automatic
coding
select
•F12“
Subsequent work
Information
If there are still fault memory entries in individual control units, start the engine briefly and then
switch it off again. Wait for approx. 10 seconds before switching the ignition on again and
re-establish the connection between the PIWIS Tester and the vehicle. Then read out and erase the
fault memories of the affected control units again separately.
3.1
Read out the fault memories of the Lane Change Assist master and Lane Change Assist slave
control units and erase them if necessary.
3.2
Switch off the ignition.
3.3
Disconnect the PIWIS Tester from the vehicle.
3.4
For vehicles with Porsche "Entry & Drive", replace the original vehicle key in the ignition lock
with the control panel again.
3.5
Switch off and disconnect the battery charger.
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Nov 21, 2017
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Service
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Invoicing
Invoicing
Invoicing
The work involved is invoiced under the labor operation:
I No.
APOS
Labor operation
91702640
Programming Lane Change Assist control units
For invoicing and documentation using PQIS, enter the following coding:
Location (FES5)
91700
Lane Change Assist control unit
Damage type (SA4)
4021
Incorrect signal
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. If a particular condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your authorized Porsche Dealer for the latest information
about whether a particular technical bulletin applies to your vehicle. Part numbers listed in these bulletins are for reference only. Always check with your authorized Porsche dealer to verify the current and
correct part numbers. 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.
© Porsche Cars North America, Inc.
Nov 21, 2017
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© 2017 Porsche Cars North America, Inc.