No. 155-21

Service
Technical Information
155/21 ENU WML0
9
WML0 – Retrofitting Loudspeaker Booster (Stop Delivery)
Revision:
This bulletin replaces bulletin Group 9 155/21 WML0 (982), dated November 29, 2022.
Model Year:
2023
Model Line:
718 (982)
Equipment:
BOSE Surround Sound System (M-no. 9VL)
Concerns:
Loudspeaker booster
Cause:
Due to worldwide semiconductor shortages experienced by some suppliers, the affected
vehicles were built without a loudspeaker booster.
Action required: Retrofit loudspeaker booster.
Affected
Vehicles:
Only vehicles assigned to the campaign (see also PCSS Vehicle Information).
AfterSales
Jan 10, 2023
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9
Service
Technical Information
ENU 155/21
WML0
Installation
Position:
Installation position
– (Retrofitting) loudspeaker booster
Required parts
Parts Info:
Part No.
Designation
Quantity
V04015001LD
 Booster
1 pc(s)
PAF008573
 Hexagon nut
4 pc(s)
9A700748300
 External hexalobular screw
4 pc(s)
Required tools
Tool:
•
•
Jan 10, 2023
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Torque wrench, 2-10 Nm (1.5-7.5 ftlb.), e.g. V.A.G 1783 - torque wrench, 2-10 Nm (1.5-7.5
ftlb.)
Torque wrench, 40-200 Nm (30-148 ftlb.), e.g. V.A.G 1332A - Torque wrench, 40-200 Nm
(30-148 ftlb.)
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Service
Technical Information
•
•
155/21 ENU WML0
9
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
Installing and teaching loudspeaker booster
NOTICE
Voltage peaks
•
Risk of damage to electrical load or to the control unit

Switch off ignition and keep transmitter key outside of the transmission range (at least 5 m).

Switch off electrical loads before disconnecting or removing them.
Work
Procedure:
Information
Always comply with the regulations for handling ESD-sensitive components!
•
Always wear approved work clothes and shoes when carrying out assembly work.
•
Do not remove new parts from ESD (electrostatic discharge) protective packaging until shortly
before installation.
•
Do not touch electric pins and plug contacts.
1
Loosen the right front seat at the threaded joint and fold it back. For instructions, see  Workshop
Manual '720119 Removing and installing front seat'
Information
The number of connecting lines for the loudspeaker booster will vary depending on equipment and
the connecting lines are located close to the installation position. These may be fastened in place
and may have to be exposed beforehand.
2
Install loudspeaker booster.  Workshop Manual '914419 Removing and installing loudspeaker
booster'
3
Fold the right front seat forward and screw it on completely. For instructions, see  Workshop
Manual '720119 Removing and installing front seat'
4
Only relevant for vehicles with Scope 6: Teaching loudspeaker booster.  Workshop Manual
'914455 Replacing loudspeaker booster'
5
Enter the campaign in the Warranty and Maintenance booklet.
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Jan 10, 2023
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Service
Technical Information
ENU 155/21
WML0
Warranty processing
Information
The working times specified below were determined specifically for carrying out this campaign and may
differ from the working times published in the PCSS Labor Operation List.
Scope 1-5:
Not relevant for this vehicle type.
Scope 6:
Installing loudspeaker booster and teaching loudspeaker booster
Relevant for
•
718 (982)
Labor time:
Retrofit loudspeaker booster
Includes:
Loosening and fastening right front seat.
Teaching loudspeaker booster
Reading out and erasing fault memories
Carry out a function test
Labor time: 64 TU
Parts required:
V04015001LD
Booster
1 pc(s)
PAF008573
Hexagon nut
4 pc(s)
9A700748300
External hexalobular screw
4 pc(s)
 Damage code WML0 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.
© 2023 Porsche Cars North America, Inc.
Jan 10, 2023
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