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Home >> BMW >> 1990 >> 325is Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Input Devices >> Main Relay (Battery)

Main Relay (Battery)

Activated by ignition switch, the main relay supplies power to MCU and other computer-controlled systems. On 325i Series, relay is located on left front shock tower. On 525i, 535i and 735i Series, relay is located in relay block, behind right front strut tower.

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