NHTSA ID Number: 11020651
Manufacturer Communication Number: L-SB-0029-25
TSB/Document Date: 2025-07-10
Summary
Some 2024 – 2025 model year TX 350, TX 500h, and TX 500h+ vehicles equipped with a Mark Levinson sound system, may exhibit one or both of the following conditions: •Audio cuts off at high or maximum volume in some high bass audio settings. •A lack of bass and sound depth from the sound system, especially from the rear speakers and subwoofer. The stereo component amplifier assembly has been modified to improve these conditions and enhance the sound system performance.
L-SB-0029-25
June 4, 2025
Mark Levinson Sound System: Sound Cuts Off at High
Volume and Lacks Bass
Service
Category
Audio/Visual/Telematics
Section
Audio/Video
Market USA and
Mexico
Applicability
YEAR(S)
MODEL(S)
2024 - 2025
TX350, TX500H, TX550H+
ADDITIONAL INFORMATION
Introduction
Some 2024 – 2025 model year TX 350, TX 500h, and TX 500h+ vehicles equipped with a
Mark Levinson sound system, may exhibit one or both of the following conditions:
Audio cuts off at high or maximum volume in some high bass audio settings.
A lack of bass and sound depth from the sound system, especially from the rear speakers
and subwoofer.
The stereo component amplifier assembly has been modified to improve these conditions and
enhance the sound system performance. Follow the Repair Procedure in this bulletin to address
these conditions.
© 2025 Lexus
, a division of Toyota Motor Sales, USA
Page 1 of 4
L-SB-0029-25
June 4, 2025
Page 2 of 4
Mark Levinson Sound System: Sound Cuts Off at High Volume and Lacks Bass
Warranty Information
For USA Market
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL2511
R & R Stereo Component Amplifier Assembly
0.7
86280-#####*
87
74
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being
repaired by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Basic Warranty. This warranty is in effect for
48 months or 50,000 miles, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
For Mexico Market
OP CODE
DESCRIPTION
TIME
OFP
T1
T2
EL2511
R & R Stereo Component Amplifier Assembly
0.7
86280-#####*
87
74
*Warranty claim MUST be submitted with the correct 10-digit OFP. Choose the correct OFP for the vehicle being
repaired by searching for the parts in the Electronic Parts Catalog using the VIN filter.
APPLICABLE WARRANTY
This repair is covered under the Lexus Basic Warranty. This warranty is in effect for
48 months or 80,000 kilometers, whichever occurs first, from the vehicle’s in-service date.
Warranty application is limited to occurrence of the specified condition described in
this bulletin.
Parts Information
PART NUMBER
PREVIOUS
NEW*
86280-0E330
86280-0E331-84
PART NAME
QTY
Stereo Component Amplifier Assembly
1
*The replacement REMAN amplifier should be ordered through Dealer Daily.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0029-25
June 4, 2025
Page 3 of 4
Mark Levinson Sound System: Sound Cuts Off at High Volume and Lacks Bass
Software Update Information
AP (AMPLIFIER) SOFTWARE ID
MODEL
MODEL YEAR
TX 350, TX 500h, TX 500h+
2024 – 2025
PREVIOUS
NEW
Older than 1400
1400 or Newer
Repair Procedure
1. Confirm the condition(s) exist(s).
Does the vehicle equipped with a Mark Levinson sound system exhibit one or both of the
following conditions:
Sound cuts off when playing audio at high or max volume in some high bass
audio settings.
A lack of bass and sound depth from the sound system, especially from the rear speakers
and subwoofer.
YES — Continue to step 2.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
2. Check the stereo component amplifier assembly software version.
Refer to TIS, applicable model and model year Repair Manual:
2024 – 2025 TX 350, TX 500h, and TX 550h+:
Audio / Visual / Telematics – Audio / Video – Radio Receiver – Registration
Is the software version listed under the Model Info AP SW (Amplifier Software) screen
older than 1400?
YES — Continue to step 3.
NO — This bulletin does NOT apply. Continue diagnosis using the applicable
Repair Manual.
© 2025 Lexus, a division of Toyota Motor Sales, USA
L-SB-0029-25
June 4, 2025
Page 4 of 4
Mark Levinson Sound System: Sound Cuts Off at High Volume and Lacks Bass
Repair Procedure (continued)
3. Remove the stereo component amplifier assembly.
Refer to TIS, applicable model and model year Repair Manual:
2024 – 2025 TX 350, TX 500h, and TX 550h+:
Audio / Visual / Telematics – Audio / Video – Stereo Component Amplifier – Removal
4. Install the NEW stereo component amplifier assembly.
Refer to TIS, applicable model and model year Repair Manual:
2024 – 2025 TX 350, TX 500h, and TX 550h+:
Audio / Visual / Telematics – Audio / Video – Stereo Component Amplifier – Installation
5. Confirm that the conditions are no longer present.
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TSB/Document ID: L-SB-0029-25
Replacement Service Bulletin Number:
MFR Communication Date: 2025-06-04
MFR Internal Campaign ID/Software Version: L-SB-0029-25
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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