9-3 Arc/Aero (9440) L4-2.0L Turbo (2.0 T) (2004)
Front Direction Indicators
The front direction indicators (27FL/FR) and side direction indicators (89LH/RH) are supplied power from UEC (342). The direction indicator function
in UEC is controlled by bus messages from BCM.
UEC activates the correct direction indicator output based on which bus messages are sent by BCM. UEC supplies voltage to the front left direction
indicator (27FL) from pin 3(F) and the side direction indicator (89LH) from output pin 4(F).
UEC supplies voltage to the front right direction indicator (27FR) from pin 2(F) and the side direction indicator (89RH) from output pin 9 (F).
Filament Monitor
UEC supplies current in each circuit. In the event of filament breakage in the front left direction indicator, for example, UEC sends the bus message
"Front left indicator not working ON" for pin 3 (F). This bus message is used by BCM (707) and ICM (736). BCM doubles flash frequency to 180
flashes per minute. ICM displays a warning message in SID.
Rear Direction Indicators
Power is supplied to the rear direction indicators (27RL/RR) from REC (701). The direction indicator function in REC is governed by bus messages
from BCM. REC activates the correct direction indicator function based on which bus messages BCM sends.
REC supplies power to the rear left direction indicator (27RL) from pin 8 (R-D) and to the rear right direction indicator (27RR) from pin 6 (R-D)
Filament Monitor
REC measures the current of the respective circuit. In the event of filament breakage or the like, REC sends the bus message "Rear left indicator not
working, ON" for pin 8 (R-D) or "Rear right indicator not working ON" for pin 6 (R-D). This bus message is used by BCM (707) and ICM (736). BCM
doubles flash frequency to 180 flashes per minutes. ICM displays a warning message in SID.
Indicator symbol in MIU
MIU uses the bus messages "Activate front left indicator ON" and "Activate front right indicator ON" to activate the indicator symbol for the left or right
direction indicator.
Acoustic indicator
ICM uses the bus messages "Activate front left indicator ON" and "Activate front right indicator ON" to send a bus message to EHU (353) to activate an
acoustic signal in the front speakers (266FL/FR). ICM priorities all acoustic indicator and warning symbols in the car. If a warning message comes while
the direction indicators are active, the direction indicator tone is interrupted while the warning tone is active in the speakers. A warning tone has higher
priority than the direction indicator tone.