GF54.50-P-2014GQ Set Compass Zone Function

GF54.50-P-2014GQ Set Compass Zone Function
- MODEL 164.1
- with CODE (523) MB Audio 20 radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08 model refinement package

- MODEL 164.1
- with CODE (510) Audio 20 with CD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08 model refinement package

- MODEL 164.1
- with CODE (525) MB Audio 50 APS radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08 model refinement package

- MODEL 164.1
- with CODE (511) Audio 50 APS with DVD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08 model refinement package

- MODEL 164.8
- with CODE (523) MB Audio 20 radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 164.8
- with CODE (510) Audio 20 with CD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 164.8
- with CODE (525) MB Audio 50 APS radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 164.8
- with CODE (511) Audio 50 APS with DVD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.0
- with CODE (523) MB Audio 20 radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.0
- with CODE (510) Audio 20 with CD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.0
- with CODE (525) MB Audio 50 APS radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.0
- with CODE (511) Audio 50 APS with DVD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.1
- with CODE (523) MB Audio 20 radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.1
- with CODE (510) Audio 20 with CD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.1
- with CODE (525) MB Audio 50 APS radio
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

- MODEL 251.1
- with CODE (511) Audio 50 APS with DVD changer
- with CODE (245) Electronic compass
as of Model Year 09 /YoM 08

Function requirement
- Circuit 30

General
The electronic compass (B26) uses the earth's magnetic field to determine the cardinal points.
The earth's magnetic poles (North/South) deviate however slightly from the geographical poles. The magnetic axis of the earth is inclined by approx. 15° compared to the earth's rot ation axis. If the cardinal compass points are to be determined with the aid of the earth's magnetic field, correction factors must be taken into account for various earth zones. To this end, 15 different compass zones are calculated.

At each location within a zone the deviation (declination) is approximately identical. If the correct compass zone is entered in the electronic compass, the earth's magnetic information can be corrected accordingly by the electronic compass and then the direction given relatively accurately (±10°).
The 15 different compass zones are listed in the following separate document:
- Setting compass zone, description

Operating instruction
The compass zones (declination) are set as follows:
- Determine appropriate compass zone (1 to 15) using zone maps (declination maps)
- Activate status "circuit 15 ON"
- Press system selection button (S110s3) repeatedly until menu "Settings" appears on multifunction display (A1p13) of instrument cluster (A1)
- Press + and - button (adjustment of specific functions and volume control (S111s1)) repeatedly until submenu "Vehicle" appears on multifunction display of instrument cluster
- Press scroll forward/back button (S110s1) repeatedly until message "Compass Setting zone" appears on multifunction display of instrument cluster
- Set appropriate compass zone using + and - button (adjustment of specific functions and volume control)

Examples for compass zone:
- San Francisco:
- North America zone map gives compass zone 4

- Berlin:
- Europe / Africa zone map gives compass zone 8

- Bonn:
- Europe / Africa zone map gives compass zone 9

To achieve as accurate a course display as possible, it may be necessary under certain conditions to change the compass zone during a route. For example 2 compass zones are driven through on the trip from Bonn to Berlin.

Function sequence
The status "circuit 5R ON" is placed on the interior CAN by the EIS [EZS] control unit (N73).
The control signals from the left multifunction steering wheel button group (S110) and right multifunction steering wheel button group (S111) are forwarded to the instrument cluster via the following path:
- Steering LIN
- Steering column tube module (N80)
- Engine compartment CAN

The electronic compass measures the direction of the near-earth magnetic field and sends the direction information cyclically (every t = 1 s) to the instrument cluster via the interior CAN.