General Information: Compass
Before troubleshooting or servicing, the technicians must be familiar with the function and operation of the compass system.
For additional information. Refer to Operating instructions.
When performing service work or Fault-Fnding, use Diagnostic Operation System VAS 5051 or Vehicle Diagnosis and Service System VAS 5052 in the function "Guided Fault Finding".
When the battery is reconnected, check any affected system or component (radio, clock, comfort electrical connection etc.) according to the repair information and/or the operating instructions.
By the use of magnetically adhered antennae on vehicle roof, there is the hazard that the compass module will malfunction due to magnetic influence and remaining magnetization of the vehicle roof. For complaints of inaccurate or faulty direction displays on the compass module, ask the customer whether a magnetically adhered antenna is being used before starting repair work.
The Roof Display Unit -J702- and Vehicle Position Recognition Control Module -J603- under back of headliner are part of the compass equipment. The Roof Display Unit -- has the following functions, depending on equipment:
- Compass display
- Auxiliary heater display
- Clock display
- Telematics operating buttons
The desired display mode can be selected using the buttons on the display unit.
The current compass direction, in which the vehicle is directed, is displayed via the compass display with up to 2 letters (for example, N = north, NW = northwest). 8 different compass directions can be displayed.
The compass is automatically calibrated permanently. If the vehicle is equipped with subsequently installed electrical devices (for example, cellular telephone, TV, etc.), compass must be calibrated manually after installation.
Determine which display unit is installed in the roof console and then perform calibration. Refer to COMPASS, CALIBRATING MANUALLY