EMC measures E81, E87 and R56

Measures to increase electromagnetic compatibility

For certain known fault profiles, design measures have already been implemented in production.

Check these design measures in the event of EMC faults:

  1. Earth strap on the luggage compartment lid
    Fault profile with effect:
    corrosion means that the earth connection between the luggage compartment lid and body is lost. This means that the luggage compartment lid oscillates and is electrically undefined.
    The reception deteriorates 2 to 3 years after production of the vehicle.

EMC measure E81 / E87

 

GR_FB6507007

Index

Explanation

Index

Explanation

1

Earth strap on the luggage compartment lid:
integrated in the luggage compartment hinge

 

 

EMC measure R56

 

GR_FB6507006

Index

Explanation

Index

Explanation

1

Earth strap on the luggage compartment lid:
integrated in the luggage compartment hinge

 

 


Notes for Service department

Diagnosis instructions

The antenna diagnosis runs as follows:

The self-diagnosis of the antenna diversity is triggered in the test module of the BMW diagnosis system. The self-diagnosis includes a check of the antenna inputs on the basis of a current measurement (direct current). If a fault is found, the antenna diagnosis aborts after the self-diagnosis.

If the self-diagnosis has a positive result, the FM antennas are specifically activated and evaluated with regard to field strength (check of the antennas).

Diagram of antenna diagnosis:

GR_FB8407006

Index

Explanation

Index

Explanation

1

Normal receive mode

(t1 to t2: diversity 2.5 Volt)

2

Self-diagnosis

3

Test of the antennas

(t6 to t8: switching pulse 8.5 Volt)

4

Self-diagnosis has positive result

(t2 to t5: 5 Volt)

5

Self-diagnosis has negative result: Fault detected

(t3 to t4: 0 Volt)

6

Actions triggered by the antenna diagnosis

(t9: AM 0 Volt


No liability can be accepted for printing or other faults. Subject to changes of a technical nature