REST monitors engine coolant temperature, it is not a timed function. If coolant drops below a certain temp, it is considered too cold to keep occupants warm, and REST shuts off. I think a friend of mine had a similar problem. It was either a battery with low charge, or his Climate Control unit needed a software upgrade. I'll contact him and ask for details.

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1995 S600, 1 of 618 (sold)

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