INSTRUMENTS
DESCRIPTION AND OPERATION 88-31
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 13. 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:
l< 1.8 volts = warning lamp off.
l> 7.7 volts = warning lamp off.
INSTRUMENTS
88-40 DESCRIPTION AND OPERATION
Audible warning speaker
The audible warning speaker is integral with the instrument pack and provides an audible warning to alert the driver
of the following situations:
lSeat belt warning lamp.
lKey in/lights on warning.
lSLABS command received warning.
lTransfer box in neutral warning.
lLights on warning.
It has a maximum pressure level of 87 dB at 1 metre (3.3 ft). The audible warning speaker is located on the rear of
the instrument pack.
The power input for the audible warning speaker is supplied by the instrument pack via fuse 27.
The BCU provides the earth paths for the following:
lThe seatbelt warning.
lKey in/lights on warning.
lLights on warning.
The SLABS ECU provides the earth paths for the SLABS commands. The EAT ECU provides the earth path for the
transfer box in neutral warning.
The BCU activates the audible warning speaker to produce audible warnings.
The audible warning speaker can operate with the ignition off.
The seatbelt warning will commence at key on, and in the event of a serial link failure, will terminate after 6 seconds.
The SLABS warnings are sounded only once for each received command.
The lights on warning and transfer box in neutral are sounded continuously until a sound off command is received.
Sound request number Sound functions Priority (1 = lowest, 6 = highest)
0Off 1
1 Seat belt warning 6
2Key-in warning 3
3 SLABS/ HDC warning 4
4 Transfer box in neutral warning 5
5 Lights on warning 2
