1995 Volvo 850 Memory Power Seats
Power seat option is available for driver’s and passenger’s seat. Seats have a memory function and an integral diagnosis system. Memory function has 3 memory buttons for different seat settings. There is one control for seat cushion and one for backrest. Seat control module, which is located under seat, controls 4 motors. Three motors are under the seat and one is in the backrest. Memory-type control module takes seat position information from 4 position sensors.
Control module contains 9 relays: 2 for each motor and one main on/off relay. Motor No. 1 controls fore and aft movement of the seat. Motor No. 2 controls backrest angle, motor No. 3 controls seat cushion height at the rear, and motor No. 4 controls seat cushion height at the front.
If system detects a broken, shorted, or grounded wire, motors can then only be operated without their memory function. If system detects a broken, shorted, or grounded motor wire, that motor is disabled. Other motors can only be operated without their memory function.
If a control button is pressed for more than 30 seconds, a timer circuit cuts off power supply to motors by disabling main relay. Seat positions are held in an EEPROM which retains information indefinitely in case of power failure.
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