onseiannai ni sitagau.

It is read:

音声案内 → おんせいあんない
に → に
従う → したがう

So the full sentence is:

おんせいあんない に したがう

音声案内 is a compound noun:

• 音声 = voice, audio, spoken sound
• 案内 = guidance, directions, information, instructions

Together, 音声案内 means something like:

• audio guidance
• voice guidance
• spoken instructions
• audio announcements

The exact English wording depends on context. For example, in a station, elevator, phone menu, or navigation system, it often refers to spoken guidance given by a machine or system.

With 従う, Japanese normally uses に to mark the thing, rule, person, or instruction that someone follows.

So:

• 音声案内に従う = follow the audio guidance
• ルールに従う = follow the rules
• 先生の指示に従う = follow the teacher’s instructions

This can feel a little strange to English speakers, because English uses a direct object:

• follow the instructions

But Japanese does not normally say 音声案内を従う.
With 従う, に is the natural particle.

従う means to:

• obey
• follow
• comply with
• act according to

It often has the nuance of following instructions, rules, guidance, orders, or someone’s will.

So in this sentence, it does not mean physically walking behind something. It means:

• follow the spoken instructions
• act according to the audio guidance

That is why 従う fits well with things like:

• instructions
• rules
• advice
• orders
• guidance

Good question. 従う is often about obeying or complying, not just moving behind someone.

For example:

• 先生の指示に従う = obey the teacher’s instructions
• 規則に従う = follow the rules

If you want to say physically go after someone, Japanese often uses expressions like:

• ついていく = go along with / follow behind
• あとをついていく = follow after someone

So 音声案内に従う is about following guidance, not physically chasing a voice.

Yes, it can still be a complete sentence in Japanese.

The dictionary form 従う is often used in:

• written instructions
• manuals
• signs
• headings
• simple, neutral statements

So 音声案内に従う。 can sound like a plain instruction such as:

• Follow the audio guidance.
• One should follow the audio guidance.

A more direct and polite instruction would be:

音声案内に従ってください。

That version is closer to Please follow the audio guidance.

Japanese often leaves out the subject when it is obvious from context.

In a sentence like 音声案内に従う。, the implied subject is usually:

• you
• the person being addressed
• people in general

So even though Japanese does not say あなたは, the meaning is still understood from the situation.

This omission is extremely common in Japanese.

No, that sounds unnatural.

With 従う, the thing being followed is normally marked by に, not を.

So the natural form is:

音声案内に従う

Not:

音声案内を従う

This is one of those cases where Japanese grammar does not match English grammar directly. Even though English says follow the guidance, Japanese uses に with this verb.

It is a compound noun made from two nouns:

• 音声
• 案内

Japanese very often combines nouns like this to make a more specific term. So while you can analyze it as two parts, it functions as one unit here:

音声案内に従う

You can think of 音声案内 as one chunk meaning audio guidance.

The difference is mainly tone and formality.

• 音声案内に従う。
  Plain form. Neutral, concise, often used in written instructions, notes, or simplified statements.

• 音声案内に従ってください。
  Polite request/instruction. This is what you would say if you want to tell someone directly, Please follow the audio guidance.

So the shorter version can sound like a label, instruction style, or plain statement, while the 〜てください version sounds more like something directly addressed to the listener.

従って is the て-form of 従う.

It is used for things like:

• connecting actions
• making requests
• giving instructions as part of a longer sentence

Examples:

• 音声案内に従ってください。
  Please follow the audio guidance.

• 音声案内に従って進んでください。
  Please proceed according to the audio guidance.

So if you see 従って, it is the same verb, just in a different grammatical form.