Convertible Top Malfunction Indicator: Description and Operation

GF77.30-P-4000RC Vario Roof Indicator Warning Messages, Function
- refinement package
- as of model year 09


Function description of control and warning messages for Vario roof, general
The convertible top mechanism control unit (N52) transmits the signal requirements for control and warning messages for the Vario roof to the instrument cluster (A1) via the interior CAN and assigns them a priority.
The function and warning messages are output by:
^ Warning buzzer in instrument cluster
^ Function and warning messages via display in instrument cluster

Warning buzzer in instrument cluster
The warning buzzer in the instrument cluster is actuated for max. 10 s with C. 15 ON and at a speed > 8 km/h when the Vario roof is unlocked. After expiration of 10 s the warning buzzer is disabled and triggered only after:
- C. 15 OFF changes to C. 15 ON or
- Vario roof changes position or
- the Vario roof actuation switch is actuated in the opposite direction of subsequent relocking or
- subsequent locking is actuated (after changing Vario roof actuation switch from "actuated" to "not actuated").

It is also possible to actuate the warning buzzer with C. 15C OFF, since the feedback of the locking state of the Vario roof is also required when the Vario roof is operated via the transmitter key (A8/1) with IR signal.

Moreover, the warning buzzer in the instrument cluster is actuated for 20 s when the stop mode is switched off. Actuation is started 15 minute before switching off the Stop mode.

Function and warning messages via display in instrument cluster
This is requested by the convertible top mechanism control unit. The convertible top mechanism control unit checks the function requirements for the display texts in the instrument cluster.

The message display is possible independently from the status of C. 15, since these messages are also required when the Vario roof is operated via the transmitter key with IR signal.

Table for control and warning signals in instrument cluster (listed according to priority of convertible top mechanism control unit)

Priority X means that these messages can be transmitted parallel to the remaining messages. Otherwise, the convertible top mechanism control unit transmits only one message to the instrument cluster with the corresponding priority.