# Service bulletin T\-TT\-0484\-18\-Rev

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: 10155248
- Published by NHTSA: 2019\-03\-25
- Manufacturer's number: T\-TT\-0484\-18\-Rev
- Manufacturer's date: 2019\-02\-28
- NHTSA component: ELECTRICAL SYSTEM

## NHTSA's summary

TT: Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low. These settings may need to be reapplied any time the phone is paired to a new head unit, a phone update is applied, or the phone is un\-paired and re\-paired.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2019/MC-10155248-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2019/MC-10155248-9999.pdf)

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

## Components

Electrical system

## Vehicles listed

- 2017 to 2019 TOYOTA 4RUNNER
- 2017 to 2018 TOYOTA AVALON
- 2016 to 2019 TOYOTA HIGHLANDER
- 2016 to 2019 TOYOTA PRIUS
- 2016 to 2017 TOYOTA PRIUS V
- 2018 TOYOTA PRIUS V
- 2016 to 2019 TOYOTA SEQUOIA
- 2016 to 2019 TOYOTA SIENNA
- 2016 to 2019 TOYOTA TACOMA
- 2016 to 2019 TOYOTA TUNDRA
- 2018 TOYOTA YARIS

## Recalls for the same vehicles and component

- [2021723](/recalls/tc/2021723.md), 2021-11-24: Electrical
- [21V688000](/recalls/nhtsa/21V688000.md), 2021-09-02: EXTERIOR LIGHTING:HEADLIGHTS; ELECTRICAL SYSTEM:WIRING
- [20V410000](/recalls/nhtsa/20V410000.md), 2020-07-15: EXTERIOR LIGHTING:TURN SIGNAL; ELECTRICAL SYSTEM:WIRING
- [2020284](/recalls/tc/2020284.md), 2020-06-25: Electrical
- [19V876000](/recalls/nhtsa/19V876000.md), 2019-12-11: ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL
- [2019434](/recalls/tc/2019434.md), 2019-08-28: Electrical
- [18V685000](/recalls/nhtsa/18V685000.md), 2018-10-04: ELECTRICAL SYSTEM:SOFTWARE; AIR BAGS
- [2018477](/recalls/tc/2018477.md), 2018-09-05: Electrical
- [18V579000](/recalls/nhtsa/18V579000.md), 2018-09-05: ELECTRICAL SYSTEM:WIRING
- [2018100](/recalls/tc/2018100.md), 2018-02-21: 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\-0790\-25](/bulletins/11022964.md), 2025-09-09, Service bulletin: ELECTRICAL SYSTEM. Some customers may experience echoing on the line calling the vehicle when using Bluetooth Hands Free. This is caused by the phone Hands Free volume being too low.
- [T\-SB\-0058\-23 Rev1](/bulletins/11020657.md), 2025-07-10, Service campaign: ELECTRICAL SYSTEM. The air conditioning dye injection tool kit has been developed to aid in identifying the location of air conditioning refrigerant leaks. The procedures outlined in this Service Bulletin aid in locating, inspecting, and repairing refrigerant leaks.
- [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.
- [T\-TT\-0754\-24](/bulletins/11003619.md), 2024-07-06, Service bulletin: ELECTRICAL SYSTEM. Customers have expressed concerns about the performance of Qi Wireless Chargers. Wireless chargers on applicable vehicles are designed to work with Qi Certified devices only. MagSafe devices, that are not Qi Certified, may not charge as expected with Qi Wireless Chargers.
- [T\-TT\-0754\-24](/bulletins/11003564.md), 2024-07-06, Service bulletin: ELECTRICAL SYSTEM. Customers have expressed concerns about the performance of Qi Wireless Chargers. Wireless chargers on applicable vehicles are designed to work with Qi Certified devices only. MagSafe devices, that are not Qi Certified, may not charge as expected with Qi Wireless Chargers.

JSON: [/v1/bulletins/10155248](/v1/bulletins/10155248)

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