This bulletin applies to 2014 BMW 528i xDrive vehicles produced to March 2012. The wipers, lights and power windows may be inoperative. This situation may start as a sporadic failure and lead to a permanent fault. One or more of the following faults may be stored:
FRM – 800E8D FRM: terminal 30A, power window regulator failed
FRM – 30000 power window, driver’s door: relay opening, no voltage
FRM – 30018 power window, driver’s door: deactivation of drive due to overvoltage
FRM – 3001E power window, driver’s door: no input voltage at relay
FRM – 800E8B FRM: terminal 30A connection for lights faulty
The cause: The connector at Z1*3B at the (Z1) front power distribution box in the passenger compartment is loose (the 7-pin connector is not fully seated into the power distribution box).
Perform vehicle diagnostics using ISTA. If the faults listed above are stored in the FRM (footwell module), proceed to the next step.
NOTE: When the ISTA system message displays “Battery voltage only “XX.XX”V, please connect charger,” note the displayed battery voltage reading in the repair order.
Follow and complete test plan “AT6300_FRM3VS – supply, footwell module.” The test plan is automatically linked to the stored faults. The test plan will prompt you to check the power supply to the FRM, which is supplied from the power distribution box via connector Z1*3B.
If the voltage measured on the FRM power supply circuits is incorrect based on the test plan normal values, check the back of the front power distribution box 7-pin connector Z1*3B to make sure that it’s properly seated in place by pushing it in until it locks.
Refer to ISTA repair instructions 6113050 (“removing and installing/replacing power distribution box in passenger compartment”). Clear the faults and re-test the system.