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:
EMC MEASURE R56 PARTS DESCRIPTION - ANTENNA DIAGNOSIS
| 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 |