Toyota 4RUNNER 2017–2021 — technical service bulletin
Bulletin T-TT-0516-18_Rev · NHTSA communication 10176493 · issued May 13, 2020
Technical service bulletin
communication type
Equipment
component
2017–2021
model years
34
vehicle entries
Official summary
TT: The microphone circuit passes through the DCM before reaching the radio/navigation system. To simplify the diagnosis of the microphone, Safety Connect SOS button lights, and DCM (Data Communication Module/telematics transceiver) inoperative conditions, refer to the procedure below to prevent unnecessary parts replacement.
Vehicles covered
- 2018 Toyota 4RUNNER
- 2019 Toyota 4RUNNER
- 2020 Toyota 4RUNNER
- 2018 Toyota Avalon
- 2019 Toyota Avalon
- 2020 Toyota Avalon
- 2018 Toyota Camry
- 2019 Toyota Camry
- 2020 Toyota Camry
- 2018 Toyota C-HR
- 2019 Toyota C-HR
- 2020 Toyota C-HR
- 2019 Toyota Corolla
- 2020 Toyota Corolla
- 2020 Toyota Corolla Hatchback
- 2018 Toyota Highlander
- 2019 Toyota Highlander
- 2020 Toyota Highlander
- 2018 Toyota Land Cruiser
- 2019 Toyota Land Cruiser
- 2020 Toyota Land Cruiser
- 2018 Toyota Prius
- 2019 Toyota Prius
- 2020 Toyota Prius
- 2017 Toyota Prius Prime
- 2018 Toyota Prius Prime
- 2019 Toyota Prius Prime
- 2020 Toyota Prius Prime
- 2021 Toyota Prius Prime
- 2019 Toyota RAV4
- 2020 Toyota RAV4
- 2018 Toyota Sienna
- 2019 Toyota Sienna
- 2020 Toyota Sienna
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.