Discovery II (LT) V8-4.0L (2002)
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Seat Belt Reminder Lamp: Description and Operation
Seat Belt Warning Lamp
The seat belt warning lamp within the instrument pack utilises a red LED and a clear legend. The BCU utilises a switch in each of the front seat belt
buckles to determine if a seat belt is not fastened.
When the ignition is switched on, the BCU illuminates the LED for 6 seconds or until the BCU determines that a seat belt is fastened which extinguished
the warning lamp. This provides the driver with a visible reminder that the seat belts are not fastened.
The instrument pack provides the self-check if the diagnostic connector fails.
The power input for the LED is supplied by the instrument pack via fuse 27. The BCU provides the earth path to illuminate the seat belt warning lamp.
The seat belt buckle switches complete the earth path in the BCU sensing circuit, the BCU commands the instrument pack to switch on the seat belt
warning lamp.
The BCU earth path to the seat belt buckle is as follows:
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< 1.8 volts = warning lamp off.
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> 7.7 volts = warning lamp off.
