No. 87-21 Service Bulletin/Repair Instructions

Service
Technical Information
87/21
ENU
2700
2
Replacement Requirements for Electronic Components - Follow Separate Procedure

(87/21)

Model Line:
Taycan (Y1A/Y1B)
Model Year:
As of 2020
Concerns:
Spare parts requirements for:

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Information:
Instrument cluster

Display and operator control unit (central display)

Display and operator control unit (front center console)

Control unit for driver assistance systems

High-voltage battery charger (OBC)

Central computer

Control unit for emergency call module and communication unit

Amplifier

Self-levelling system control unit

High-voltage heating (PTC)

Thermal management control unit

Front/rear door control unit

Rear-differential lock control unit

Engine sound system booster, interior/exterior
Due to a software update for various control units that has taken place in the meantime,

components with non-current software were blocked in the central parts warehouse (ZEL) for

further use.

In order to maintain supply capability should one of the affected electronic components require

replacement even in the event of a part shortage, these electronic components have been released

again subject to compliance with a separate procedure for software updating. Depending on the specific

component concerned, control unit programming must also be carried out according to the procedure

described below after installation.
Action required: Programme affected electronic components after installation in order to update the software to the

required status.

In the section "Affected part number" you will find an overview of the affected parts.
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Information

If the vehicle is affected by workshop campaign WMA5 or WMA6, but this has not yet been carried out:

•
Carry out workshop campaign WMA5  Technical Information 'WMA500 WMA500 -WMA5

Workshop campaign - Update software of different control units' or WMA6  Technical Information

'WMA600 WMA6 Workshop campaign - Update software of various control units' after component

replacement to update the components to the required software status. Then check software

versions and ensure that the required software status is available on the components according to

the corresponding information.
If the vehicle is not affected by workshop campaign WMA5 or WMA6, or the campaign has already been

carried out:

•
Carry out the procedure described below for control unit programming depending on the specific

component replaced. Continue in the section "Affected part numbers". Then check software

versions and ensure that the required software status is available on the components according to

the corresponding information.
If the vehicle is affected by workshop campaign WMA5 or WMA6, delivery to the customer must not take

place without previously completing the workshop campaign.
Affected part numbers

Parts Info:
If one of the components mentioned below has been replaced on the vehicle, the programming must be

carried out as described in section  Technical Information 'WMA600 Control unit programming 1'.

Component assignment 1
Jul 15, 2021

Page 2 of 30
Designation
Part No.
Instrument cluster
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9J1920911P 5Q0

9J1920913P 5Q0

9J1920901M IA6

9J1920903M IA6

9J1920901P IA6

9J1920903P IA6

9J1920901M IA7

9J1920903M IA7

9J1920901P IA7

9J1920903P IA7

9J1920901M IA8

9J1920903M IA8

9J1920901P IA8

9J1920903P IA8
Charger for high-voltage battery (OBC) 22 KW

(For 11 KW charger see "Component assignment

5")
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9J1915681AD
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Control unit for self-levelling function
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9J1907553L
Thermal management control unit
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PAB965429D
High-voltage heating (PTC)
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9J1963507C
Rear-differential lock control unit
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9J1927771C
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If one of the components mentioned below has been replaced on the vehicle, the programming must be

carried out as described in section  Technical Information 'WMA600 Control unit programming 2'.

Component assignment 2

Designation
Part No.
Control unit for emergency call module and

communication unit
•

•

•
9J1035283C

9JA035284C

4K2035282B
Engine sound system booster (interior)
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9J1035446D
Engine sound system booster (exterior)
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9J1035335D
Front/rear door control unit
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PAB959795
If one of the components mentioned below has been replaced on the vehicle, the programming must

be carried out as described in section  Technical Information 'WMA600 Control unit programming component assignment 3'.

Component assignment 3

Designation
Part No.
Central computer
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•

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9J1035084M

9J1035086M

9J1035089M

9J1035092M

9J1035136M

9J1035140N

9J1035840N

9J1035070T

9J1035089T

9J1035140T

9J1035840T

9J1035877T

9J1035070TX

9J1035089TX
Display and operator control unit (central display)
•

•

•
9J1919599F

9J1919599G

9J1919597H
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Display and operator control unit (front center

console)
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•
9J1919610H

9J1919611H
Amplifier
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•
9J1035223E (for Burmester)

9J1035223D (Bose)
If one of the components mentioned below has been replaced on the vehicle, the programming must

be carried out as described in section  Technical Information 'WMA600 Control unit programming component assignment 4 new'.

Component assignment 4

Designation
Part No.
Control unit for driver assistance systems
•

•

•
PAD907107

PAD907108

PAD907117
If one of the components mentioned below has been replaced on the vehicle, the programming must

be carried out as described in section  Technical Information 'WMA600 Control unit programming component assignment 5'.

Component assignment 5

Designation
Part No.
Charger for high-voltage battery (OBC) 11 KW

(For 22 KW charger see "Component assignment

1")
•
PAB915684K
Required tools

Tools:

Information

The Taycan (Y1A) is equipped as standard with a lithium starter battery.

Lithium starter batteries must only be charged using a suitable battery charger that has a current

and voltage-controlled charge map.

For further information about the battery chargers to be used, see  Workshop Manual '270689

Charging battery/vehicle electrical system'.

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•
Jul 15, 2021

Page 4 of 30
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 90 A battery

charger

9900 - PIWIS Tester 3 with PIWIS test software version 40.250.040 (or higher) installed.
AfterSales
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Technical Information
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ENU
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Control unit programming - component assignment 1

NOTICE

Fault entry in the fault memory and control unit programming aborted due to undervoltage.

•
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 starting control unit programming, connect a suitable battery charger with a current rating of at

least 90 A to the vehicle.

NOTICE
Control unit programming will be aborted if the WiFi connection is unstable.

•
An unstable WiFi connection can interrupt communication between the PIWIS Tester and the vehicle

communication module (VCI). As a result, control unit programming may be aborted.

During control unit programming, always connect the PIWIS Tester to the vehicle communication module

(VCI) via the USB cable.

NOTICE
Control unit programming will be aborted if the driver's key is not recognized

•
If the driver's key is not recognized in the vehicle, programming 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.

NOTICE
Programming interrupted

•
Malfunctions in control unit
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Risk of damage to control unit

Route the line between the vehicle communication module (VCI) and diagnostic socket on the vehicle

without tension and make sure that the connector is inserted fully into the diagnostic socket.

Check that the rechargeable battery for the PIWIS Tester is charged sufficiently. Connect the PIWIS Tester

to the power supply unit if necessary.
Work Work

Procedure:
This programming process is only intended for the following control units:

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•

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Instrument cluster

High-voltage battery charger (OBC), 22 kW

Control unit for self-levelling function
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Thermal management control unit

Rear-differential lock control unit
1
Carry out general preliminary work for control unit programming as described in  Workshop

Manual '9X00IN Basic instructions and procedure for control unit programming - section on

"Preliminary work"'.
2
Connect a suitable battery charger, e.g. battery charger 90A, to the jump-start terminals and

switch it on.
3
Position the driver's key with the back facing

forward upright between the holding struts in the rear

cupholder (emergency start tray) to guarantee a

permanent radio link between the vehicle and remote

control  Emergency start tray -Arrow-.
4
Connect 9900 - PIWIS Tester 3 to the vehicle

communication module (VCI) via the USB cable.

Then connect the communication module to the

vehicle and switch on the PIWIS Tester.
5
Establish operational readiness (switch on ignition).
6
On the PIWIS Tester start screen, call up the 'Diagnostics' application.
Emergency start tray
The vehicle type is then read out, the diagnostic application is started and the control unit selection

screen is populated.

7
Programming control unit

Specific information on control unit programming in the context of this Technical Information:
Jul 15, 2021

Page 6 of 30

12 3 4 5

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