NHTSA ID Number: 11020860
Manufacturer Communication Number: B25-003
TSB/Document Date: 2025-07-23
Summary
Service Bulletin - An uneven sealing surface allows moisture to enter the inner taillight(s), causing one or both of the inner taillights not to work.
Service Bulletin
July 9, 2025
25-003
Version 2
Warranty Extension: 2014–19 MDX and 2017–19 MDX Sport Hybrid
Moisture in the Inner Taillights
Supersedes 25-003 dated April 18, 2025, to revise the information highlighted in yellow.
APPLIES TO
Year
Model
Trim Level
VIN Range
2014–19
MDX
ALL
Check iN VIN status inquiry for eligibility.
2017–19
MDX Sport Hybrid
ALL
Check iN VIN status inquiry for eligibility.
REVISION SUMMARY
•
Under TOOL INFORMATION, the note has been updated.
•
Under WARRANTY INFORMATION, the warranty tables have been updated.
•
Under REPAIR PROCEDURE, steps 10 and 16 have been updated.
•
Under REPAIR PROCEDURE, the image in step 15 has been updated.
•
Under REPAIR PROCEDURE, a note was added after step 24.
BACKGROUND
An uneven sealing surface allows moisture to enter the inner taillight(s), causing one or both of the inner taillights not to
work.
NOTE:
• All Safety Recalls must be completed before this warranty extension can be applied.
• Acura is extending the warranty coverage on the inner taillights, related to this condition, to 9 years and unlimited
mileage from the original date of purchase.
• This warranty extension does not apply to any vehicle that has ever been declared a total loss or sold for salvage by a
financial institution or insurer or has a branded or similar title under any state’s law.
CLIENT NOTIFICATION
Owners of affected vehicles will be sent a notification of this campaign.
Do an iN VIN status inquiry to make sure the vehicle is shown as eligible.
CORRECTIVE ACTION
Inspect and, if necessary, replace the inner taillight(s).
CLIENT INFORMATION: The information in this bulletin is intended for use only by skilled technicians who have the proper tools, equipment, and
training to correctly and safely maintain your vehicle. These procedures should not be attempted by “do-it-yourselfers,” and you should not assume this
bulletin applies to your vehicle, or that your vehicle has the condition described. To determine whether this information applies, contact an authorized
Acura automobile dealer.
© 2025 American Honda Motor Co., Inc. – All Rights Reserved
Page 1 of 12
PARTS INFORMATION
Part Name
Part Number
Quantity
Right Inner Taillight (RIGHT LID LIGHT ASSEMBLY)
34150-TZ5-H04
1
Left Inner Taillight (LEFT LID LIGHT ASSEMBLY)
34155-TZ5-H04
1
Right Inner Taillight (RIGHT LID LIGHT ASSEMBLY) (A-Spec)
34150-TZ5-A73
1
Left Inner Taillight (LEFT LID LIGHT ASSEMBLY) (A-Spec)
34155-TZ5-A73
1
Fuse (7.5A) (depending on trim level)
38221-SNA-A31
1
Fuse (10A) (depending on trim level)
38221-SNA-A41
1
REQUIRED MATERIALS
Part Name
Part Number
Quantity
08712-0010
1 (One Tube Will Repair 50 Vehicles)
Commercially available
1
Tool Number
Quantity
Sealant Template
07AAJ-TZ5A200
1
Body Clip (To hold the template)
91501-S04-003
2
3M Stripe Off Wheel with Hardware
MMM07498
1
3M Stripe Off Wheel (Wheel only)
MMM07499
1
Penguin 353 Sealer
Masking Tape
TOOL INFORMATION
Tool Name
NOTE:
• The maximum recommended RPM for the 3M Stripe Wheel is 4,000 RPM.
• Each 3M Stripe Off Wheel can be used on 20 VINs (10 VINs on each side of the wheel).
Page 2 of 12
WARRANTY CLAIM INFORMATION
NON-A-SPEC
7141G3
Replace left inner
taillight, check inner
taillight harness, check
fuse (includes
inspection)
0.6 hr
7141G4
Replace right inner
taillight, check inner
taillight harness, check
fuse (includes
inspection)
0.6 hr
7141G5
Replace both inner
taillights, fuse, & check
inner taillight harness
(includes inspection)
7141G3
B25003A
34155-TZ5-A72
B25003B
34150-TZ5-A72
0.8 hr
B25003C
34155-TZ5-A72
Replace sub harness,
& left inner taillight
(includes inspection)
0.6 hr
B25003D
34155-TZ5-A72
7141G4
Replace sub harness,
& right inner taillight
(includes inspection)
0.6 hr
B25003E
34150-TZ5-A72
7141G5
Replace both inner
taillights and fuse.
Check inner taillight
harness.
0.8 hr
B25003F
34155-TZ5-A72
6L800
QLL00
A-SPEC
6L800
QLL00
Page 3 of 12
INSPECTION PROCEDURE
1. Turn on the parking lights and check the taillight operation.
Inspection Result
Repair Direction
Inner taillights are working.
Go to step 2.
Both inner taillights are not working.
If the outer taillights are working, check the sub
harness fuse (5A) and connections then replace both
inner taillights.
One inner taillight is not working.
Replace the affected inner taillight.
Both outer and inner taillights are not working.
Proceed with normal troubleshooting.
2. Inspect for any signs of water intrusion into the inner taillight assemblies.
• If water intrusion is found, replace the affected taillight(s). Go to REPAIR PROCEDURE.
• If no water intrusion is found, no further action is required.
Page 4 of 12
REPAIR PROCEDURE
NOTE:
• The new inner taillight sub harness is permanent and should never be removed.
• The inline fuse in the harness can be serviced by replacing the 5A fuse.
1. Open the tailgate.
NOTE: To prevent damage to the tailgate support struts, do not use the power tailgate function (if equipped) during the
repair. Open and close the tailgate manually.
2. Remove the tailgate upper trim panel, then remove the side trim panels.
3. Remove the pull pocket, then disconnect the power tailgate switch connector.
4. Remove and disconnect the tailgate light connectors.
Page 5 of 12
5. Remove the tailgate lower trim panel.
6. Disconnect the license sub-harness connector, remove the five nuts, release the pins from the clips, then remove the
rear license trim.
Page 6 of 12
7. Disconnect both inner taillight connectors.
8. Remove the failed inner taillight(s) by removing the two mounting bolts and two mounting nuts.
NOTE: Be sure to completely remove the old inner taillight gasket from the tailgate surface.
Page 7 of 12
Dust Sealer Removal
NOTE: Only remove the sealer from the failed inner taillight that was just removed.
9. Install the template to the inner taillight location on the tailgate using the body clips.
10. Use the top edge of the template to mark the area with a marker where the dust sealer needs to be removed. The
sealer should be removed from between the vertical lines, and along the edge of the template.
NOTE: There should be no dust sealer remaining inside the marked area.
11. Once the dust sealer removal area has been marked, remove the template.
12. Seal the tailgate before doing the dust sealer removal:
1. Place tape over the opening for the lid light.
2. From the inside of the tailgate, place tape over the opening for the inner taillight.
Page 8 of 12
13. Place tape over the edge of the outer taillight to keep debris from getting into the housing.
14. With the tailgate closed, and while wearing proper eye protection, use a drill (or equivalent rotary tool) with the 3M
Stripe Off Wheel to remove the dust sealer between the markings.
NOTE:
•
•
•
Ensure that the power tool being used is appropriate for the type of stripe off wheel being used.
The maximum RPM for the recommended 3M Stripe Off Wheel is 4,000 RPM.
The stripe off wheel will only remove paint where there is sealer underneath the paint.
Page 9 of 12
15. Use the template as a guide to ensure enough sealer has been removed.
NOTE: If the template indicates that additional sealer needs to be removed, remove the template, then continue to
remove sealer as needed with the stripe off wheel.
Example of finished sealer removal:
16. Place a tracking mark on the center of the stripe off wheel after each VIN is repaired. When 10 VINs have been
completed (10 tracking marks have been added), flip the wheel over and repeat the process for 10 more VINs. After 20
VINs have been completed (10 tracking marks on each side of the wheel), replace the stripe off wheel with a new
wheel.
Page 10 of 12
Apply Sealer
17. With the template installed, use a marker to make a line across the top edge of the template, then remove the template.
18. Place tape along the underside of the line that was drawn in the previous step.
19. Apply a thin bead of Penguin Seal 353 to the area above the tape where the tailgate panels meet. While wearing a
glove, run a finger along the new sealer to seal the panel joint and smooth the sealer across the area where the old
sealer was removed.
Page 11 of 12
20. Immediately remove the tape below the sealer and allow 15 minutes for the sealer to dry.
NOTE: You can proceed to the next step while the sealer is drying.
21. Remove the remaining masking materials from the outer taillight and inside the tailgate.
Inner Taillight Installation
22. Install the new inner taillight(s) and connect them.
23. Make sure all the taillights come on.
24. Install all remaining parts in the reverse order of removal.
NOTE: The new inner taillight sub harness is permanent and should never be removed. The inline fuse in the sub-harness
can be serviced by replacing the 5 A fuse.
Page 12 of 12
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TSB/Document ID: B25-003
Replacement Service Bulletin Number:
MFR Communication Date: 2025-07-09
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: VISIBILITY/WIPER
MFR Component System:
MFR Component Subsystem:
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