Warranty Extension: 2019-2020 Acura RDX MOST Bus Network Connectors

NHTSA ID Number: 10190296

Manufacturer Communication Number: B21-009

Summary

Service Bulletin – A loose connection in the MOST bus network is causing a popping or crackling from the speakers, a blank display, or no sound from the audio system. You may also see a Network Loss message, Center Display Unit Stays On with Ignition Turned to OFF and Door Open, display switches between the Day Mode and Night Mode, the Drive mode not available message appears, or Disclaimer is stuck on.

 


B21-009
April 9, 2021
Version 3

Warranty Extension: 2019-20 RDX MOST Bus Network Connectors

Supersedes 21-009, dated February 18, 2021, to revise the information highlighted in yellow.

 

AFFECTED VEHICLES

Year Model Trim Level VIN Range
2019-20RDXALLCheck the iN VIN status for eligibility.

 

REVISION SUMMARY

Under BACKGROUND, the miles were updated.

 

BACKGROUND

A loose connection in the MOST bus network is causing a popping or crackling from the speakers, a blank display, or no sound from the audio system. You may also see a Network Loss message, Center Display Unit Stays On with Ignition Turned to OFF and Door Open, display switches between the Day Mode and Night Mode, the Drive mode not available message appears, or Disclaimer is stuck on.

American Honda is extending the warranty for the MOST bus network on these vehicles to 6 years or 74,000 miles from the original date of purchase, whichever comes first.

 

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

Install the FAKRA connector set.

 

PARTS INFORMATION

Part Name Part Number Quantity
Rear Pillar Trim Clip91561-TA5-A11eBay logo1
FAKRA Connector Set39817-TJB-AC0eBay logo3

 

TOOL INFORMATION

NOTE: The tool listed below is a required tool that should be in your dealer inventory. Order additional tools only if your tools are damaged and need replacement.

Tool Name Part Number Quantity
Straight FAKRA Puller07AAC-THRA2001

 

INSPECTION PROCEDURE

1. Check the software version in the audio unit. Go to the HOME screen and select, Settings, System. Scroll to About and select Acura Software System.

Is D.1.2.1 or higher displayed?

Yes – Go to step 2.

No – Using OTA, update the audio unit software to D.1.2.1 or higher, then continue with step 2.

 

2. Turn the ignition to ON, and on the touch pad, press and hold the Back, Home, and Cards List buttons at the same time. Hold until the Dealer Diagnostics menu screen appears in the primary information area. You will hear a tone when you release the buttons.

 

3. Using Touchpad A, select DETAIL INFORMATION & SETTING.

 

4. Scroll down the menu, and select SHUTDOWN REASON.

 

In this example, the cause of the failure can be identified as Meter:SUDDEN_SIGNAL_OFF.

 

5. Write down any failures as they will be collected on the warranty claim. Then, clear the data.

 

REPAIR PROCEDURE

1. Remove the dash side panel and air vent.

 

2. Remove the two screws.

 

3. Remove the lower trim, and disconnect the switch connectors and in-car temp sensor.

4. Remove the lower center cover to expose the infotainment unit.

 

5. Remove the two tie down hooks on the passenger side, then remove the load floor strip.

 

6. Remove the cargo floor lid, cargo bin, then the rear trim panel.

 

7. Remove the bolt from the rear seat cushion.

 

8. While pushing down on the rear seat cushion, pull the seat hook handles to release the hooks.

 

9. Pull back the seat cushion to pull the seat belt buckles from the slits in the seat cushion.

 

10. With rear seat heaters: Disconnect the connectors.

 

11. Remove the rear seat cushion.

 

12. Remove the lower trim.

 

13. Remove the rear passenger seat hinge cover by lifting it up.

 

14. Remove the inner handle cap.

 

15. Pull back and remove the lower side trim panel.

 

16. Remove the two screws.

 

17. Using a rubber mallet, apply a light blow to disengage the quarter pillar trim clip (a must-replace part). Then, remove the quarter pillar trim. Once it is removed, install a new quarter pillar trim clip.

 

18. With rear speaker: Disconnect the rear speaker from the upper quarter pillar trim.

 

19. Disconnect the red and green MOST connectors at the infotainment, stereo amplifier, and tuner units using the straight FAKRA puller. Do not pull on the units while the FAKRA connectors are connected to help prevent communication issues.

NOTE: To avoid mixing up the wires, remove only one FAKRA connector at a time.

 

20. Using a small flat-tip screwdriver, remove the secondary lock, then break off the tab as shown.

 

21. Pull and twist counterclockwise to remove the housing from the wire. Then, discard the housing and lock.

 

22. Select the correct color FAKRA housing, then slide the new terminal onto the wire until it clicks into place.

 

23. Line up the locking tabs of the FAKRA housing to the new terminal, then slide the new terminal into the housing until it clicks.

 

24. Repeat steps 20 thru 23 for the other connectors. Then, install the MOST connectors to the infotainment, amplifier and tuner units.

 

25. Install all the removed parts in the reverse order of removal. When installing the units, make sure the harness is routed correctly as a misrouted harness can put pressure on the connectors which may cause a connection issue. Do not pull on the units while the FAKRA connectors are connected to help prevent communication issues.

 

26. Test-drive the vehicle to confirm the repair. If the repair was not successful, continue with normal troubleshooting based on client symptom(s).

 

END

 


2 Affected Products

Vehicle

MAKEMODELYEAR
ACURARDX2019-2020

 


1 Associated Document

Manufacturer Communications

B21-009
April 9, 2021
Version 3

MC-10190296-0001.pdf 2982.6KB

 


NHTSA ID Number: 10187544

Manufacturer Communication Number: B21-009

Summary

Service Bulletin – A loose connection in the MOST bus network is causing a popping or crackling from the speakers, a blank display, or no sound from the audio system. You may also see a Network Loss message, Center Display Unit Stays On with Ignition Turned to OFF and Door Open, display switches between the Day Mode and Night Mode, the Drive mode not available message appears, or Disclaimer is stuck on.

 

1 Associated Document

Manufacturer Communications

B21-009
February 18, 2021
Version 1

MC-10187544-0001.pdf 3024.891KB

 


NHTSA ID Number: 10190300

Manufacturer Communication Number: ONLF9O04052021

Summary

“Owner Notification Letter – On some 2019 RDX models, a loose connection in the MOST bus network may cause the following:

-A popping or crackling from the speakers, a blank display, or no sound from the audio system

-Network Loss and/or Drive Mode Not Available Messages or the disclaimer message stuck on

-The center display staying on after turning the vehicle to the OFF mode with the door open

-Display switches between the Day Mode and Night Mode

On some 2020 RDX models, a loose connection in the MOST bus network may cause the following:

-A popping or crackling from the speakers, a blank display, or no sound from the audio system

-A Network Loss message

For vehicles that display any of the above respective symptoms, American Honda is extending the warranty for the MOST bus network on these vehicles to 6 years or 72,000 miles from the original date of purchase, whichever comes first.”

 

1 Associated Document

Manufacturer Communications

Service Bulletin #21-009 Defect 6M100 / Symptom F9O00
April 2021

MC-10190300-0001.pdf 312.055KB

 


 

SaleBestseller No. 1
FOXWELL Car Scanner NT604 Elite OBD2 Scanner ABS SRS Transmission
  • [Easy to Use—Work Out of the Box] + [FOXWELL 2026 New Version] FOXWELL NT604 Elite scan tool is the 2026 new version from FOXWELL, designed for car owners who want to figure out the cause of issues before fixing car problems by scanning common systems like ABS, SRS, engine, and transmission. The NT604 Elite obd2 scanner diagnostic tool comes with the latest software—no need to waste time downloading software first. Plug the scanner into the OBDII port with OBDII cable to start the diagnosis.
  • [Affordable] + [Reliable Car Health Monitor] Will you be confused what happens when the warning light of ABS/SRS/transmission/check engine flashes? Instead of taking your cars to dealership, this FOXWELL scanner will help you do a thorough scanning and detection for your cars and pinpoint the root cause. Note:The device is a diagnostic tool, not a repair tool. To turn off a warning light, you must first physically repair the issue causing it. Only then can the scanner be used to clear the corresponding fault code.
  • [5 in 1 Car Diagnostic Scanner] Compared with obd scanners (50-100), NT604 Elite code scanner not only includes their OBDII diagnosis but also serves as ABS/SRS scanner, transmission and check engine code reader. When it’s an odb2 scanner, you can use it to check if your car is ready for annual test through I/M readiness menu. In addition, live data stream, built-in DTC library, data play back and print, all these features are a big plus for it. Note: doesn't support maintenance functions like reset or relearn. For the SRS system, NT604 Elite can read and clear common fault codes not caused by a crash, but crash/collision data cannot be cleared.
  • [Fantastic AUTOVIN] + [No extra software fee] Through the AUTOVIN menu, this NT604 Elite car scanner allows you to get your V-IN and vehicle info rapidly, no need to take time to find your V-IN and input one by one. What's more, the NT604 Elite ABS SRS scanner supports 60+ car brands from worldwide (America/Asia/Europe). You don’t need to pay extra software fee. AUTOVIN may not work on some older vehicles or certain vehicle brands. If AUTOVIN fails, please input the vin code manually or go to the Diagnostic Menu to select your vehicle model.
  • [Solid protective case KO plastic carrying bag] + [Lifetime update] Almost all same price-level car scanner diagnostic tool only offers plastic bag to hold the scanner.However, NT604 Elite automotive scanner is equipped with solid protective case, preventing your obd2 scanner from damage. Then you don’t need to pay extra money to buy a solid toolbox.
SaleBestseller No. 2
OBDMATE OBD2 Scanner with ABS SRS Transmission, Reset Fault Lights | Check Engine Code Reader with Full OBDII Functions | DLC Pin Test | Battery Voltage Check, Car Diagnostic Tool
  • 【Reset ABS/SRS/Transmission/Engine Lights】 More than an check engine code reader, OBDMATE OM901 obd2 scanner performs comprehensive diagnostics for the 4 most-used systems (ABS/SRS/Engine/Transmission). It quickly clears fault codes, turns off warning lights, read data stream and auto VIN.
  • 【3.5" Handheld Scanner with 4 System Diagnose】 3.5" Super large TFT screen equipped displays an intuitive menu and clear readings of various sensors from ABS, SRS, ECM and TCM systems. It arrived with a silicone protective case and hard-shell carrying case, ensuring long-lived durability and drop resistance. The car diagnostic tool is plug-to-play designed, plug it and get diagnosis started without any batteries or updates required.
  • 【One-Click I/M Readines&Full OBD2 Functions】 Press F1 to get an intuitive corloured form about whether various emissions-related systems on the vehicle are operating properly. Help you get smog-check ready quickly. OM901 car scanner supports all essential OBD2 functions you need: read & clear codes, view freeze frame, read I/M readiness, retrieve VIN, live data stream (with graphing display), O2 sensor test, onboard monitoring mode, and EVAP leak test.
  • 【Battery Voltage Check&DLC Pin Test】 It allows you to monitor battery health by testing current battery voltage. Plus, this obd2 diagnostic tool features DLC 16-PIN test to check current voltage of every pin.
  • 【Automotive Scanner Diagnostic Kit】 The package comes with 1 car scanner, 1 USB-type c cable, 1 hard storage bag and 1 user manual(en). Free to update without any hidden fees. 5 languanges available in setting including English, French, Italian, German and Espanish. Valuable and Portable, making it a great tool kit for car owners, DIY enthusiasts, and professional mechanics.
SaleBestseller No. 3
BLCKTEC 460T OBD2 Scanner Car Code Reader Engine ABS SRS Transmission Diagnostic Tool, 12 Reset Services, Oil/TPMS/EPB/BMS/SAS/DPF/Throttle Reset, ABS Bleeding, Battery Test, Auto VIN, Free Update
803 Reviews
BLCKTEC 460T OBD2 Scanner Car Code Reader Engine ABS SRS Transmission Diagnostic Tool, 12 Reset Services, Oil/TPMS/EPB/BMS/SAS/DPF/Throttle Reset, ABS Bleeding, Battery Test, Auto VIN, Free Update
  • [All System Diagnostics, Professional-Level Scanner] - BLCKTEC 460T is the ultimate OBD2 diagnostic tool for home mechanics and professionals. It supports all 10 OBD2 modes, reads and clears Engine/Transmission/ABS/SRS codes, performs All-System Diagnostics, offers workshop reset tools, and provides real-time live data. It helps you pinpoint issues, assess your car's condition, and prepare for SMOG checks with ease. NOTE: Function availability depends on your vehicle. Before you buy, be sure to use the Compatibility Checker on BLCKTEC website or contact our customer support to verify that the features you need are supported for your vehicle’s specific year, make, and model.
  • [12+ Most Popular Reset Functions] - BLCKTEC 460T OBD2 scanner offers 12+ dealer-level service functions, including Oil Maintenance Reset, ABS Bleeding, EPB Reset, SAS(Steering Angle Sensor) Recalibration, DPF(Diesel Particulate Filter) Reset, Throttle Body Relearn, Battery Reset/Initialization, TPMS Relearn, Transmission Reset, Fluid Change Reset, Maintenance Reset and more, enabling you to perform workshop services like a pro. NOTE: Function availability depends on your vehicle. Be sure to use the Compatibility Checker on BLCKTEC website to verify that the features you need are supported for your vehicle.
  • [Real-Time OBD2 and OEM Live Data, Freeze Frame Data] - BLCKTEC 460T helps diagnose vehicle issues when warning lights like Check Engine Light or ABS/SRS Light appear. It offers detailed DTC info, ECU Freeze Frame Data, and real-time OBD2 and advanced OEM live data, including Engine, Transmission, ABS, SRS, and more, making it easy to diagnose and resolve vehicle problems. You can view, graph, record, replay, and overlay up to four live data streams in a single graph for better analysis.
  • [AutoVIN, AutoReLink, AutoScan, 3X Faster] - Equipped with AutoVIN technology, 460T automatically retrieves the VIN to save you time. Its AutoScan and AutoReLink features scan all of the vehicle's ECUs and detect any fault codes immediately after you plug the scanner into the vehicle's OBD2 port - no button presses required. Additionally, it regathers DTC and I/M readiness information every 30 seconds, simplifying monitor tests. 460T's advanced technology makes it 3X faster than other products.
  • [Get RepairSolutions2, the #1 Auto Repair App for Free] - When paired with RepairSolutions2(RS2) App, 460T becomes even more powerful. RS2's Verified Fix Database built by master technicians, provides the parts needed for the repair. Additionally, RS2 gives you access to OEM warranty info, maintenance schedules, TSB, and dealership recall info, making car care easier than ever. RS2 is free with no subscription fees and it stores your car scan reports in the cloud, allowing you to access, share, or print them anytime and anywhere.
Bestseller No. 4
BlueDriver OBD2 Scanner Bluetooth, No Subscription, ABS SRS TPMS
  • [Diagnose Like a Pro] BlueDriver Pro is a professional OBD2 scanner and diagnostic tool that helps you scan, understand, and clear vehicle trouble codes with confidence. Turn your phone into a powerful car diagnostic scanner—no guesswork, no unnecessary repairs.
  • [Read and Clear More Codes Than Ever] Read and clear more codes than basic car code readers. Access enhanced diagnostics for Check Engine, ABS, SRS, Airbag, TPMS, Transmission.
  • [Verified Fixes and Real-Time Data] Get unlimited, technician-verified repair reports matched to your VIN, with definitions, causes, and confirmed fixes. Monitor live vehicle data as you drive, view freeze frames, check smog readiness, and analyze Mode 6 test results.
  • [Wireless & Bluetooth Enabled] - Say goodbye to wires. BlueDriver connects with Bluetooth via your phone/tablet to a sensor that plugs into your car's OBDII port. Get all of the capabilities of an expensive code reader & scan tool without any annoying wires.
  • [Broad Make & Model Coverage] Strong support for GM, Ford, Stellantis (RAM, Jeep, Chrysler), ToyotaeBay logo, Honda, Nissan, Mazda, Subaru, Hyundai, Mercedes-Benz, BMWeBay logo, and VWeBay logo.
Bestseller No. 5
Innova SD35 OBD2 Scanner – ABS, SRS, TPMS & Check Engine Code Reader, Live Data, All System Diagnostics, Compatible with Most Vehicles
  • OBD2 SCANNER FOR ALL SYSTEMS – The INNOVA SD35 is a tablet-based OBD2 scanner designed for advanced diagnostics. Read and clear check engine light, ABS, SRS, and TPMS codes, plus test your car battery and alternator to prevent unexpected failures. Vehicle coverage may vary. Please use Innova’s Coverage Checker to verify compatibility.
  • ALL-SYSTEM DIAGNOSTICS & LIVE DATA – Unlike basic code readers, this OBD2 scanner for all vehicles scans engine, transmission, ABS, SRS, and more. Get real-time live data, including RPM, fuel trims, temperature readings, and oxygen sensor performance.
  • OBD2 TABLET WITH USER-FRIENDLY INTERFACE – This automotive scan tool features a high-resolution display, making vehicle diagnostics faster and easier.
  • ADVANCED TPMS, OIL RESET & SERVICE FUNCTIONS – Perform TPMS sensor checks, oil light reset, and other service resets with ease This professional diagnostic tool provides comprehensive vehicle maintenance capabilities in one device.
  • WIDE VEHICLE COVERAGE (1996 & NEWER CARS & TRUCKS) – This OBD2 scanner Bluetooth tablet is compatible with ToyotaeBay logo, Ford, Honda, Chevrolet, Nissan, Dodge, and more. However, feature coverage may vary. Please use Innova's Coverage Checker to verify coverage.

 


This product presentation was made with AAWP plugin.

Leave a Comment

Share to...