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Home >> BMW >> 1989 >> 325is Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Theory/Operation >> Computerized Engine Controls >> Input Devices >> A/C Switch

A/C Switch

When the A/C system is turned on, MCU sees battery voltage signal at pin No. 41 and pin No. 40 when compressor engages. This signals MCU to adjust idle speed, if necessary.

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