Back-up Functions

The PHM first tries to establish contact by means of the main antenna, then the back-up antenna. If this fails, contact is established via satellite. In this mode, only data is communicated.

The back-up functions only work when: 

• the SOS or On Call button is used,
• a component is activated in the SRS system,
• the alarm is tripped.

Back-up Battery 

If there is no normal power supply, the back-up battery takes over the power supply.

The battery can be replaced.

If the battery capacity falls below 30%, the driver is alerted by a message on the DIM.

Back-up Antenna 

If there is no normal antenna connection, the back-up antenna takes over the functions.