Substitute Value

The audio and RTI system s have no substitute values in case of fault in systems components.

The telephone system has substitute values which are automatically activated by the phone module (PHM) when a certain type of fault occurs. There are four different types of situation which give rise to substitute values:

• In case of a fault in the handset the phone module (PHM) forces the telephone system to use the handsfree. Message in the display.
• In case of a fault in the handsfree equipment the phone module (PHM) forces the telephone system to use the handset. Message in the display.
• At faults that affect the user access to the other telephone functions. The phone module (PHM) reduces system functionality so that the telephone may only make/accept calls. This also occurs when Driver information module (DIM) or CAN communication is lost. When functionality is reduced a message is displayed (if Driver information module (DIM) has not been lost.
• At faults that might cause damage to the components with continued use. The phone module (PHM) switches off the telephone box, handsfree, hand set and bus between Phone module (PHM) and the telephone box.

The phone module (PHM) guides a return to normal function when the fault is remedied.