# Service bulletin B21100A

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10202602
- Published by NHTSA: 2021\-10\-28
- Manufacturer's number: B21100A
- Manufacturer's date: 2021\-10\-22
- NHTSA component: AIR BAGS; SEATS

## NHTSA's summary

ServiceNews Article \- There are several possible causes for the SRS DTC U3000\-49 \(Internal Failure of the SRS Unit\) to be stored. If you can duplicate the DTC, the troubleshooting will take you through the step\-by\-step process in isolating the faulty component. In most situations, the SRS Unit should be last on the list of components to replace. Here is a quick tip for troubleshooting a faulty seat weight sensor.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202602-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10202602-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Air bags, Seats

## Trouble codes named

U3000

## Vehicles listed

- 2020 ACURA ILX
- 2020 ACURA MDX
- 2020 ACURA NSX
- 2020 ACURA RDX
- 2020 ACURA RLX
- 2020 ACURA TLX

## Recalls for the same vehicles and component

- [2026251](/recalls/tc/2026251.md), 2026-05-21: Seats And Restraints
- [26V332000](/recalls/nhtsa/26V332000.md), 2026-05-21: AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
- [2024059](/recalls/tc/2024059.md), 2024-02-01: Airbag
- [24V064000](/recalls/nhtsa/24V064000.md), 2024-02-01: AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION:FRONT PASSENGER
- [2023127](/recalls/tc/2023127.md), 2023-03-09: Seats And Restraints

## Other bulletins for the same vehicles and component

- [B20\-019](/bulletins/10215510.md), 2022-07-07, Service bulletin: SEATS; EQUIPMENT. "Service bulletin \- When speeding up, slowing down, stopping, or turning, you hear or feel a noticeable clicking/popping from the driver's and/or front passenger's seat\-back. Clients sometimes compare this to someone kicking the back of the seat. This sensation can also happen when adjusting the seat or shifting your weight in it."
- [BTI\&03082022902](/bulletins/10209087.md), 2022-03-15, Service bulletin: SEATS; LATCHES/LOCKS/LINKAGES. Dealer Message \-American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 RDXs with a client complaint of the center console lid \(armrest\) not latching/staying closed intermittently or at all times. To better understand the cause of this condition, AHM would like to collect specific information from the vehicle prior to you attempting a repair of any kind.
- [BTI\&01032022901](/bulletins/10206447.md), 2022-01-12, Service bulletin: SEATS. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 RDXs with a client complaint of the center console lid \(armrest\) not latching/staying closed intermittently or at all times. To better understand the cause of this condition, AHM would like to collect specific information from the vehicle prior to you attempting a repair of any kind.
- [BTI\&12152021905](/bulletins/10205471.md), 2021-12-22, Service bulletin: SEATS. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 RDXs with a client complaint of the center console lid \(armrest\) not latching/staying closed intermittently or at all times. To better understand the cause of this condition, AHM would like to collect specific information from the vehicle prior to you attempting a repair of any kind.
- [B21100A](/bulletins/10203504.md), 2021-11-16, Service bulletin: AIR BAGS; SEATS. ServiceNews Article \- There are several possible causes for the SRS DTC U3000\-49 \(Internal Failure of the SRS Unit\) to be stored. If you can duplicate the DTC, the troubleshooting will take you through the step\-by\-step process in isolating the faulty component. In most situations, the SRS Unit should be last on the list of components to replace. Here is a quick tip for troubleshooting a faulty seat weight sensor.
- [BTI\&10252021901](/bulletins/10202912.md), 2021-11-03, Service bulletin: SEATS. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 RDXs with a client complaint of the center console lid \(armrest\) not latching/staying closed intermittently or at all times. To better understand the cause of this condition, AHM would like to collect specific information from the vehicle prior to you attempting a repair of any kind.
- [BTI\&09102021901](/bulletins/10201462.md), 2021-09-16, Service bulletin: SEATS; SEATS:CRITICAL FASTENERS. Dealer Message \- American Honda Motor Co., Inc. \(AHM\) is searching for certain 2020\-2021 RDXs with a client complaint of the center console lid \(armrest\) not latching/staying closed intermittently or at all times. To better understand the cause of this condition, AHM would like to collect specific information from the vehicle prior to you attempting a repair of any kind.
- [B20\-022](/bulletins/10173888.md), 2020-04-16, Service bulletin: SEATS. Service Bulletin \- The bolt holes for the replacement second row seat frames are not threaded and require special self\-tapping bolts to secure the seat cushion and seat\-back frame to the seat frame.
- [B20\-004](/bulletins/10170637.md), 2020-01-23, Service bulletin: EQUIPMENT; SEATS. Service Bulletin \- When the front passenger seat is occupied, and the vehicle is turning, a tick or click is heard. There is too much clearance in the front passenger lower seat frame around the area of the seat weight sensor bracket.

JSON: [/v1/bulletins/10202602](/v1/bulletins/10202602)

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