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Technical Information

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Customer Complaint - Air Conditioning Does Not Function At Times: Information on charge
management (96/17)
Vehicle Type:

Panamera S E-Hybrid (970/971) / Cayenne S E-Hybrid (92A)

Model Year:

As of 2014

Subject:

Air-conditioning system function

Situation:

Customers complain that the air conditioning does not function at times or after starting it.
The air conditioning does not turn on or is turned off if the state of charge of the high-voltage battery is
very low and also if the battery is not sufficiently charged while driving.

Information
To protect the high-voltage battery from damage, the air conditioning to the passenger
compartment is turned off if the battery charge is low.
The state of charge of the high-voltage battery can drop below the limit value under the following
conditions:
•

The high-voltage battery is not connected to a charging station and charged while the vehicle is
parked up for a long time.

•

The high-voltage battery is not sufficiently charged by the combustion engine while driving and too
many electrical loads are switched on.

Component protection (technical principles):
•

The cells of a battery will be damaged if the battery is fully discharged.

•

Component protection for the high-voltage battery is activated as required to prevent the
battery from becoming fully discharged.

•

The value of 0% in the vehicle (display on the instrument cluster) corresponds to a real value of
a remaining charge of 15% (customer SOC).

•

The value of 15% (customer SOC) can be displayed using the PIWIS Tester  "High-voltage
battery" control units  Actual values/input signals.

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 If the state of charge or the remaining charge in the high-voltage battery drops below this
15%, the air conditioning is turned off.
 This behavior (electrical load is switched off) is a component protection measure and does not
constitute a defect or malfunction.
 Given this, replacing or repairing components will not resolve the issue and is not justified.
Information for the customer:
•

There is a technical reason why the air conditioning turns off at times when the state of charge of
the high-voltage battery is low (around 0% as displayed by the vehicle instrumentation).

•

This protects the high-voltage battery,

•

is not a defect or malfunction and

•

does not justifyreplacing components.

 This behavior can be prevented by charging the high-voltage battery at regular intervals,
particularly if the vehicle is parked up for a long time.
 Further information about charge management and the behavior of the high-voltage battery can
also be found in the Owner's Manual.
Invoicing:

For documentation using PQIS, enter the following coding:

Location (FES5)

87010

Air conditioning

Damage type (SA4)

1613

Does not function at times

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.
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