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siegfriedschubert2

Hilux MOST bus fault

Alright Hilux gurus, I'm at my wit's end! My 2008 Hilux with the diesel engine is giving me a headache. The audio system is completely dead, no sound whatsoever. The navigation is also kaput. I scanned it and it's throwing a MOST bus fault. Anyone seen this before? I'm dreading this could be expensive...

Summary of the thread

A 2008 Hilux with a diesel engine is experiencing a complete failure of the audio system and navigation, with a diagnostic scan indicating a MOST bus fault. This suggests a communication issue between control units, likely due to a defect in one of the units connected to the MOST bus. The recommended solution is to have a professional workshop diagnose the problem, as they have the necessary tools and expertise. Ultimately, the issue was traced to the navigation unit, which was replaced to restore functionality.

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4 comment(s)

michaelmiller1

MOST bus? Sounds like a communication issue between the control units. With those symptoms and that fault code, a defect in one of the control units connected to the MOST bus is highly probable. Have you checked the fuses, or tried disconnecting/reconnecting any of the affected units?

siegfriedschubert2 (community.author)

Fuses are all good, yeah. Disconnecting/reconnecting... you mean like the radio unit itself, or is there more to it than that? Where would I even start looking for the other control units on that bus?

michaelmiller1

It's a fiber optic bus system for data transmission. If the radio unit's fuse is fine, the problem is deeper. Locating all the units on the MOST bus requires diagrams, specific to your Hilux's configuration. It's probably best to take it to a workshop with experience in car electronics. They have the tools to diagnose which control unit is failing. Could save you a lot of time and frustration.

siegfriedschubert2 (community.author)

Yeah, you're probably right. Bit the bullet and took it in. Turns out it was the navigation unit itself causing the whole bus to crash. 1000€ later and everything is working again. Thanks for the heads up about the MOST bus system!

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TOYOTA

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HILUX