122-U8T8P-03

Service
Technical Information
168/18 ENU
2705
2
Complaint - Battery Low and Yellow Warning Message "Battery low _ Service necessary" in
instrument cluster: Re-programming gateway control unit (battery sensor) (168/18)
Model Line:
Cayenne (9YA)
Model Year:
As of 2018 up to 2019
Subject:
Gateway control unit (battery sensor)
Information:
Information
In the event of a customer complaint about a flat battery and if the yellow warning message
"Battery low _ Service necessary" ( Yellow warning message: Battery low _ Service necessary)
appears in the instrument cluster, the following points must be observed before doing any other work:
•
A chain of different factors can cause an increased closed-circuit current (greater than 1.0 A) after
charging, see also  Technical Information '944900 Complaint - Battery flat and specific fault code
in front-end electronics control unit: Observe specified procedure (154/18)'.
•
A battery sensor software version lower than "1000" can bring about this symptom.
•
In the event of a customer complaint and if the battery sensor software version in the gateway
control unit is lower than "1000", re-program the gateway control unit as described in the
"Procedure" section.
Replacing components will not resolve the problem.
Yellow warning message: Battery
low _ Service necessary
Date of
Introduction:
A control unit with adapted software has been used during production since April 12, 2018 or as of
chassis number 9Y 2KD A9 5209.
Tools:
•
•
9900 - PIWIS Tester 3 with software version 38.000.010 (or higher) installed
Battery charger with a current rating of at least 90 A.
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Technical Information
168/18
Work
Procedure:
NOTICE
Voltage drop
•
Risk of irreparable damage to control unit
•
Risk of damage to control unit
•
Fault entries in the control unit
•
Coding in the control unit is aborted
•
Malfunctions in control unit, even during programming

Before disconnecting the control unit, switch off ignition and remove ignition key.

Make sure that the power supply is not interrupted during programming.

Connect battery charger/power supply - Suitable for AGM Type batteries, recommended current
rating of 90A fixed voltage 13.5V to 14.5V.
1
Preliminary work:
1.1
Connect a battery charger with a current rating of at least 90 A.
1.2
Switch on the ignition.
NOTICE
Coding will be aborted if the WLAN connection is unstable.
•
An unstable WLAN connection can interrupt communication between PIWIS Tester 3 and the
vehicle communication module (VCI). As a result, coding/programming may be aborted.

During control unit coding/programming, always connect PIWIS Tester 3 to the vehicle
communication module (VCI) via the USB cable.
1.3
9900 - PIWIS Tester 3 with software version 38.000.010 (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.
1.4
On the PIWIS Tester start screen, call up the  'Diagnostics' menu.
The diagnostic application is then started and the control unit selection screen is populated.
2
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"Gateway" control unit  re-program:
AfterSales
Service
Technical Information
168/18 ENU
2705
2
Information
The procedure described here is based on the 9900 - PIWIS Tester 3 test software version
38.000.010.
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.
Menu
•

Control
unit/Function
Instructions/information or
2.1
Control units
’Overview’
2.2
 Follow instructions:
•
•
'Additional menu'
•
Campaign
number

confirm/execute
 Result/consequence of action
call up
Create Vehicle Analysis Log (VAL) if necessary and
carry out any campaigns that are available for the vehicle.
2.3
2.4
Action

•F7“
•Yes“/•No“/
•F12“
‘Campaign’
select
•F12“
Value:
’L5V4A’
enter
•F12“
Read and follow the information and instructions on the PIWIS Tester during the guided
programming sequence. Then press •>>“ to continue.
During the programming sequence, the control unit is re-programmed and then re-coded automatically if necessary.
Do not interrupt programming and coding.
Once control unit programming - and coding if necessary - is complete, you will be prompted to
switch the ignition off and then back on again after a specified waiting time.
2.5
Control units
’Overview’
2.6
'Extended
identifications'
select
Battery sensor software version
programmed during this campaign
1000
Gateway
select
If programming is not completed successfully (error message “Programming unsuccessful”),
programming must be repeated.
3
Subsequent work:
3.1
Read out and erase all fault memories.
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168/18
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.
3.2
Switch off ignition.
3.3
Disconnect the PIWIS Tester from the vehicle.
3.4
Calibrate the battery by charging it fully.
 Workshop Manual '2X00IN Trickle charging 12-volt lithium-ion battery'
3.5
Switch off and disconnect the battery charger.
End of action required.
Invoicing:
The work involved is invoiced under the labor operation:
APOS
Labor operation
90352500
Programming gateway control unit
I No.
For invoicing and documentation using PQIS, enter the following coding:
Location (FES5)
27060
Vehicle electrical system battery
Damage type (SA4)
1611
does not function
References:
 Technical Information '944900 Complaint - Battery flat and specific fault code in front-end electronics
control unit: Observe specified procedure (154/18)'
 Workshop Manual '2X00IN Trickle charging 12-volt lithium-ion battery'
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.
Feb 7, 2019
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AfterSales