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emma_shadow27

Sequoia MOST bus fault

Hey, I'm having a real headache with my 2015 Toyota Sequoia (gas engine). The audio system is completely dead – no sound whatsoever. The navigation is also kaput. I ran a car diagnostics tool and it showed a 'MOST bus fault'. Anyone ever dealt with this? I'm not super tech-savvy, so any help would be greatly appreciated!

Summary of the thread

The issue involves a 'MOST bus fault' in a 2015 Toyota Sequoia, leading to a non-functional audio system and navigation. The MOST bus is a fiber optic network for multimedia data transmission, and a fault could be due to a malfunctioning control unit, such as the radio tuner or amplifier. While checking fuses is a simple first step, diagnosing the specific faulty unit typically requires specialized tools and expertise, suggesting a visit to a qualified workshop for proper diagnosis and repair.

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4 comment(s)

lilian_nacht5

Greetings. I understand your frustration. The symptoms you describe align with a malfunctioning MOST (Media Oriented Systems Transport) bus. The MOST bus is a fiber optic network used in some vehicles for high-speed data transmission between control units, primarily those related to multimedia. If one of the control units on the bus fails, it can disrupt the entire system, leading to the issues you're experiencing. I encountered a similar issue on my 2018 Audi A6. Have you checked the fuses related to the audio and navigation systems? Sometimes a blown fuse can mimic a more complex problem.

emma_shadow27 (community.author)

Thanks for the info! I did check the fuses, and they all seem fine. What exactly does 'control unit' mean in this case? Is that something I can check myself, or am I looking at a mechanic visit?

lilian_nacht5

A 'control unit', in this context, refers to an electronic module responsible for a specific function, such as the radio tuner, amplifier, navigation computer, or DVD player, all of which might be connected via the MOST bus in your Sequoia. While it's theoretically possible to diagnose the specific faulty unit yourself using specialized diagnostic equipment and software to monitor the MOST bus communication, it typically requires a level of expertise and tools beyond what most individuals possess. Considering the complexity and the need for specialized tools to pinpoint the exact module causing the fault, I would suggest consulting a qualified workshop with experience in automotive diagnostics and fiber optic systems. In my case, with the Audi, the dealer had to use their diagnostic tools to pinpoint the faulty module. After replacing it the repair cost was about 1000€.

emma_shadow27 (community.author)

Thanks a bunch for your help! It sounds like this is beyond my capabilities. I'll take it to a workshop and have them diagnose the MOST bus. I appreciate you sharing your experience with the Audi; that gives me a good idea of what to expect.

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TOYOTA

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SEQUOIA