EMC measures RR Convertible

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 exhaust system
    Fault profile with effect:
    EMC faults are conducted through the exhaust system from the engine compartment via the exhaust system to the rear. This disrupts the antenna system.
    In areas with poor transmission power, AM reception is disrupted or is lost at an earlier stage.

Earth strap on the left-hand side of the vehicle

GR_FB6507010

Index

Explanation

Index

Explanation

1

Earth strap on the exhaust system:
rear left at the rear silencer

 

 

Earth strap on the right-hand side of the vehicle

GR_FB6507011

Index

Explanation

Index

Explanation

1

Earth strap on the exhaust system:
rear right at the rear silencer

 

 


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