How does the causative passive form of the verb work?

The causative form of a Japanese verb is the 'to make (someone) do' or 'to let (someone) do' form. An equivalent of this verb form doesn't exist in English.

For example, kuruma wo ugokaseta, from ugoku "to move", means 'I made the car move'.

Making causative forms of verbs
Type of verb	Ending	Examples
godan, or "consonant" (*)	-seru	kaku, "write", becomes kakaseru tatsu, "stand", becomes tataseru yomu, "read", becomes yomaseru
ichidan, or "vowel" (*)	-saseru	miru, "see", becomes misaseru kakeru becomes kakesaseru
kahen (**)	-saseru	kuru, "come", becomes ko-saseru
sahen (**)	-saseru	suru becomes se-saseru (***) or saseru

(*) See What are group I and group II (also consonant and vowel) verbs? for definitions.
(**) See What Japanese verbs are irregular? for definitions.
(***) Modern Japanese rarely, if ever, uses the form se-saseru. Another ichidan verb, saseru, originally a short form of se-saseru, is used instead.

To make causative into passive forms, one attaches -rareru to the mizenkei of -seru or -saseru.

Causative-passive forms of verbs
Type of verb	Ending	Examples
godan, or "consonant" (*)	-serareru	kaku, "write", becomes kakaserareru or kakasareru tatsu, "stand", becomes tataserareru or tatasareru yomu, "read", becomes yomaserareru or yomasareru
ichidan, or "vowel" (*)	-saserareru	miru, "see", becomes misaserareru kakeru becomes kakesaserareru
kahen (**)	-saserareru	kuru, "come", becomes kosaserareru
sahen (**)	-saserareru	suru becomes sesaserareru or sareru

For the godan verbs, instead of -se-rareru forms, the -sareru forms shown in red above also commonly occur. The ending -serareru is gramatically correct for godan verbs. But the -sareru forms are more common than the -serareru forms. However, for ichidan and kahen verbs, -sareru forms do not exist. For example, mi-sareru, kake-sareru, ko-sareru are impossible.

This godan sareru causative-passive verb ending usually doesn't appear in textbooks.

Now let's consider what the -sareru forms of passive causative are. I think they are either:

short forms for -se-rareru forms.
mizenkei of causative verbs derived from godan verbs plus -reru adding the meaning of passive.

The latter idea is based on the assumption that mizenkei of a godan verb plus suffix -su produces another godan verb of causative meaning. For example, yaru (to do something) becomes yarasu (to make/let someone do something). Thus yarasu can be used as a godan verb, although the usage is not standard.

Examples of yarasu:

Mizenkei: Kare ni sono shigoto wa yarasanai* hou ga yoi.
Ren'yōkei: Kare ni sono shigoto wo yarashi* mashita.
Shūshikei: Sono shigoto wa kareni yarasu*.
Rentaikei: Sono shigoto wo kare ni yarasu no ha yamero.
Kateikei: Sono Shigoto wa kare ni yaraseba* yoi.

The forms marked with '*' above are not natural but may be possible. The rentaikei (see What is the 'i' verb ending?) form of yarasu is quite possible. So it can be said that yarasu itself is a godan verb.

Acknowledgements

Edited from a post to sci.lang.japan by ITO Kazumitsu

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