Calibrate compass function - GF54.50-P-2013GQ

MODEL 164.1 with CODE (523) MB Audio 20 radio with CODE (245) Electronic compass as of Model Year 09/Year of Modification 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/Year of Modification 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/Year of Modification 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/Year of Modification 08 model refinement package 

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

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

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

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

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

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

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

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

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

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

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

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

Function requirements 

• All electrical consumers in the vehicle which can be switched off (e.g. air conditioning system, rear window heater, windshield wipers) are switched off
• All doors and the liftgate of the vehicle are closed
• Calibration trip in open terrain (in which it is possible to drive a full circle)
• No antenna masts, bridges, large buildings or power lines in the vicinity of the open terrain
• Correct compass zone of the electronic compass (B26) is set

General 

After a break in the voltage supply, e.g. by a disconnected or discharged battery (G1), the electronic compass must be recalibrated.

During a calibration trip, it is important that the electronic compass passes through all cardinal points. For this reason, the calibration will be completed fastest when the calibration trip is conducted on a circular path; the tangents on a circle have a different orientation at each point of the circle.

During a calibration trip the electronic compass measures the magnetic relationships of the vehicle. As a result the electronic compass is able to compensate magnetic overlays which otherwise might lead to route errors.

Ferromagnetic materials (e.g. iron and nickel) influence their surrounding magnetic field and thus locally also the earth's magnetic field, which the electronic compass also uses for calibration. Electric currents likewise influence the magnetic field of their surroundings Each conductor through which a current flows is surrounded by a magnetic field, the strength of which is dependent on the amperage. For these reasons the above prerequisites should be observed during calibration.

Operating instruction 

The electronic compass is calibrated as follows:

• Start engine
• 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 sub-menu "Vehicle" appears on multifunction display of instrument cluster
• Press scroll forward/back button (S110s1) repeatedly until message "Compass calibration" appears on multifunction display of instrument cluster
• Select "Start" using + and - button (adjustment of specific functions and volume control)
• Message "Compass calibration active Please drive in a complete circle" appears on multifunction display of instrument cluster
• Drive in a circle at a speed of approx. 8 km/h until message "Compass calibration Successfully completed" appears on multifunction display of instrument cluster

If the message "Compass calibration Successfully completed" does not appear on the multifunction display of the instrument cluster after t = 3 min, calibration has failed. In this case the calibration should be carried out at a different location.

Function sequence 

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.

	Electrical function schematic "Calibrate compass"	Model 164	PE54.50-P-2051-97MAA
		Model 251	PE54.50-P-2051-97RAA
	Instrument cluster, component description	A1	GF54.30-P-6000GM
	Electronic compass component description	B26	GF54.50-P-4102GQ
	Component description for the steering column module control unit	N80	GF54.21-P-6051GM