This instruction show your guide on how to repair BMW car driver side windows can not work.It is caused by the FEM trouble.
Fault phenomenon: The driver’s window cannot be raised or lowered.
Fault code:The driver’s door window lifter; the relay is disconnected, and there is no output voltage. The driver’s door lifter: the system is not standardized.
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Fault analysis: The motor has no voltage when measured, and the circuit diagram is found. The motor is controlled by the internal relay of the FEM, and it is determined that the FEM computer is damaged.
Remove the body computer and measure the relay according to the circuit diagram terminal. Remove the relay and energize the coil. The relay is damaged. Replace it to eliminate the fault.
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