# Service bulletin 21TC04 \- C\-HR \-

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: 10201362
- Published by NHTSA: 2021\-09\-13
- Manufacturer's number: 21TC04 \- C\-HR \-
- Manufacturer's date: 2021\-07\-08
- NHTSA component: ELECTRICAL SYSTEM; SEAT BELTS

## NHTSA's summary

DP: The subject vehicles are equipped with a rear seat belt reminder system that illuminates indicators temporarily after the ignition is turned on if rear seat belts are not buckled. Due to incorrect programming in a certain electronic control unit, certain situations can cause the rear seat belt reminder system not to illuminate the indicator as designed.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10201362-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10201362-9999.pdf)

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

## Components

Electrical system, Seat belts

## Vehicles listed

- 2021 TOYOTA C\-HR

## Recalls for the same vehicles and component

- [2021723](/recalls/tc/2021723.md), 2021-11-24: Electrical

## Other bulletins for the same vehicles and component

- [T\-SB\-0106\-22 Rev2](/bulletins/11028726.md), 2026-02-11, Service bulletin: ELECTRICAL SYSTEM. OBSOLETE NOTICE January 30, 2026: This bulletin is now obsolete. Please see T\-SB\-0001\-26.
- [T\-SB\-0001\-26](/bulletins/11028722.md), 2026-02-11, Service bulletin: ELECTRICAL SYSTEM. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool \(SST\) USB flash drive to update the map, points of interest, and system software.
- [T\-TT\-0780\-25](/bulletins/11019332.md), 2025-06-06, Service bulletin: ELECTRICAL SYSTEM. To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE.
- [T\-TT\-0780\-25](/bulletins/11018329.md), 2025-05-15, Service bulletin: ELECTRICAL SYSTEM. To assist with the early detection and early resolution of audio related concerns you may be asked to recover MMR data from the head unit. The following steps are instructions on how to retrieve the data from the system and are only to be used when requested by FTS and/or FPE.
- [T\-SB\-0106\-22 Rev2](/bulletins/11016786.md), 2025-04-08, Service bulletin: ELECTRICAL SYSTEM. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool \(SST\) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update, however, the process for generating license keys differs from previous generations.
- [T\-SB\-0106\-22 Rev2](/bulletins/11015500.md), 2025-03-11, Service bulletin: ELECTRICAL SYSTEM. Some 2018 – 2024 model year Toyota vehicles equipped with a Premium Audio with Dynamic Navigation System require a Special Service Tool \(SST\) USB flash drive to update the map, points of interest, and system software. The SST is used with applicable vehicles to deliver the update, however, the process for generating license keys differs from previous generations.
- [22TC01 Technical](/bulletins/10245474.md), 2023-11-27, Service bulletin: ELECTRICAL SYSTEM. TI: TECHNICAL INSTRUCTIONS FOR 22TC01 DATA COMMUNICATION MODULE \(DCM\) REPROGRAMMING CERTAIN 2021 MODEL YEAR C\-HR, RAV4 PRIME, TUNDRA CERTAIN 2021\-2022 4RUNNER, HIGHLANDER, HIGHLANDER HV, PRIUS PRIME, SEQUOIA, TACOMA CERTAIN 2022 PRIUS
- [T\-SB\-0057\-18](/bulletins/10238157.md), 2023-06-26, Service bulletin: EQUIPMENT; ELECTRICAL SYSTEM. TSB: The Immobilizer and Smart Key Reset is a feature that allows the registration of new keys when all master keys are lost. Once the system is reset, all previously registered keys will be erased. Follow the procedures in this bulletin to reset a vehicle Immobilizer or Smart Key system.
- [Service Campaign](/bulletins/10220151.md), 2022-09-15, Service bulletin: ELECTRICAL SYSTEM. DL: Due to improper programming of the Data Communication Module \(DCM\), which provides cellular communication in various situations, including emergencies, the driver and Safety Connect operator may not be able to hear each other?s voices during a Safety Connect call
- [22TC01](/bulletins/10214367.md), 2022-06-21, Service bulletin: ELECTRICAL SYSTEM. TECHNICAL INSTRUCTIONS FOR 22TC01 DATA COMMUNICATION MODULE \(DCM\) REPROGRAMMING CERTAIN 2021 MODEL YEAR C\-HR, RAV4 PRIME, TUNDRA CERTAIN 2021\-2022 4RUNNER, HIGHLANDER, HIGHLANDER HV, PRIUS PRIME, SEQUOIA, TACOMA CERTAIN 2022 PRIUS

JSON: [/v1/bulletins/10201362](/v1/bulletins/10201362)

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