the cluster sends a message notifying the PCM of the condition, the instrument cluster and the PCM will each store
a DTC. The Electronic Throttle Control indicator is serviced with the instrument cluster.
FOG LAMP INDICATOR
The fog lamp indicator gives an indication to the vehi-
cle operator whenever the optional fog lamps are illu-
minated. This indicator is controlled by a transistor on
the instrument cluster circuit board based upon cluster programming and electronic messages received by the clus-
ter from the Front Control Module (FCM) (also known as the Integrated Power Module/IPM) over the Controller Area
Network (CAN) data bus.
The fog lamp indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit, and
that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on the
fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only
illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn
on the fog lamp indicator for the following reasons:
•
Fog Lamp-On Message - Each time the cluster receives a fog lamp-on message from the FCM indicating the
fog lamp relay is energized, the fog lamp indicator will be illuminated. The indicator remains illuminated until
the cluster receives a fog lamp-off message from the FCM.
•
Actuator Test - Each time the cluster is put through the actuator test, the fog lamp indicator will be turned on,
then off again during the bulb check portion of the test to confirm the functionality of the LED and the cluster
control circuitry.
The instrument cluster continually monitors a hard wired input from the headlamp switch to determine the selected
fog lamp switch status. The instrument cluster then sends the proper fog lamp-on and lamp-off messages to the
FCM over the CAN data bus. The FCM activates the fog lamp relay then sends the proper fog lamp indicator
lamp-on and lamp-off messages to the instrument cluster. For further diagnosis of the fog lamp indicator or the
instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRICAL/INSTRUMENT CLUSTER - DIAG-
NOSIS AND TESTING). The Fog Lamp indicator is serviced with the instrument cluster.
HIGH BEAM INDICATOR
The high beam indicator gives an indication to the
vehicle operator whenever the headlamp high beams
are illuminated. This indicator is controlled by a tran-
sistor on the instrument cluster circuit board based upon cluster programming and a hard wired multiplex input
received by the cluster from the headlamp beam select switch circuitry of the multi-function switch on the washer/
beam select switch mux circuit.
The high beam indicator Light Emitting Diode (LED) is completely controlled by the instrument cluster logic circuit,
and that logic will allow this indicator to operate whenever the instrument cluster receives a battery current input on
the fused B(+) circuit. Therefore, the LED can be illuminated regardless of the ignition switch position. The LED only
illuminates when it is provided a path to ground by the instrument cluster transistor. The instrument cluster will turn
on the high beam indicator for the following reasons:
•
High Beam Headlamps-On Input - Each time the cluster detects a high beam headlamps-on input from the
headlamp beam select switch circuitry of the multi-function switch on the washer/beam select switch mux cir-
cuit, the headlamp high beams and the high beam indicator will be illuminated. The headlamp high beams and
the high beam indicator remain illuminated until the cluster receives a high beam headlamps-off input from the
multi-function switch, or until the exterior lamp load shedding (battery saver) timed interval expires, whichever
occurs first.
•
Actuator Test - Each time the cluster is put through the actuator test, the high beam indicator will be turned
on, then off again during the bulb check portion of the test to confirm the functionality of the LED and the
cluster control circuitry.
The instrument cluster continually monitors the headlamp switch and the multi-function switch to determine the
proper headlamp low beam and high beam control. The instrument cluster then sends the proper low beam and
high beam lamp-on and lamp-off messages to the Front Control Module (FCM) over the Controller Area Network
(CAN) data bus and turns the high beam indicator on or off accordingly. For further diagnosis of the high beam
indicator or the instrument cluster circuitry that controls the indicator, (Refer to 8 - ELECTRICAL/INSTRUMENT
CLUSTER - DIAGNOSIS AND TESTING). The High Beam indicator is serviced with the instrument cluster.
8J - 60
INSTRUMENT CLUSTER - SERVICE INFORMATION
LX