E 450 V8-5.4L (2009)
be stationary for at least 10 seconds at each direction.
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Is the compass display accurate in each direction?
Yes
The compass is OK. REVIEW the operation of the compass with the customer.
No
INSTALL a new compass display (overhead console). REFER to Compass Display See: Service and Repair. TEST the system for normal operation.
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A7 CHECK THE VOLTAGE SUPPLY TO THE COMPASS DISPLAY
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Ignition OFF.
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Disconnect: Overhead Console C930.
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Ignition ON.
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Measure the voltage between the overhead console C930-1, circuit CBP43 (GY) harness side and ground.
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Is the voltage greater than 10 volts?
Yes
TURN the key to the OFF position. GO to A9.
No
VERIFY the SJB fuse 43 (10A) is OK. If OK, REPAIR the circuit. TEST the system for normal operation. If not OK, REFER to the Wiring Diagrams to
identify the possible causes of the circuit short.
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A8 CHECK THE DIMMING CIRCUIT
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Ignition OFF.
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Disconnect: Overhead Console C930.
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Turn the headlamp switch to the PARKING LAMPS ON position.
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Measure the voltage between the overhead console C930-4, circuit VLN04 (VT/GY), harness side and ground and rotate the headlamp switch
knob counterclockwise to the stop position.
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With the headlamp switch knob in the full stop (counterclockwise) position, is the voltage greater than 10 volts?
Yes
GO to A9.
No
REFER to Instrument Panel, Gauges and Warning Indicators to diagnose the instrument cluster and panel illumination.
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