Page 3017 of 5883
EXL-16
< FUNCTION DIAGNOSIS >
HEADLAMP AIMING SYSTEM (AUTOMATIC)
Part Description
Height sensorControls the headlamp aiming motor signal ground based on vehicle height and vehicle
speed.
Headlamp aiming motorMoves the headlamp up/down based on input from the height sensor. Located in the front
combination lamp LH and RH.
Page 3018 of 5883

DAYTIME LIGHT SYSTEM
EXL-17
< FUNCTION DIAGNOSIS >
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DAYTIME LIGHT SYSTEM
System DiagramINFOID:0000000001527654
System DescriptionINFOID:0000000001527655
The daytime light system operates the front clearance lamps, rear tail lamps and license plate lamps. The
BCM monitors the engine running status and lighting switch (combination switch) signal to determine whether
the daytime light system should be activated. With the engine running and the lighting switch OFF, the BCM
sends a signal via CAN communication to the IPDM E/R (Intelligent Power Distribution Module Engine Room)
to activate the headlamp low relay and the daytime light relay. The IPDM E/R supplies ground to the headlamp
low relay coil and daytime light relay coil which then energize to send power to the low beam headlamps, front
clearance lamps, rear tail lamps and license plate lamps.
Component Parts LocationINFOID:0000000001527656
AWLIA0027GB
1. IPDM E/R E46, E47, E48 2. BCM M16, M17, M18, M19 (view with
glove box removed)3. Combination switch M28
4. Combination meter M24 5. Daytime light relay E67
ALLIA0332ZZ
Page 3019 of 5883
EXL-18
< FUNCTION DIAGNOSIS >
DAYTIME LIGHT SYSTEM
Component Description
INFOID:0000000001527657
Part Description
BCM Monitors lighting switch position, engine running status and parking brake status to
determine if conditions are set for daytime light system operation.
Requests the IPDM E/R via CAN communication lines to ground the daytime light
relay coil.
IPDM E/RControls ground to the daytime light relay coil based on requests from the BCM (via
CAN communication lines).
Combination switch
(Lighting & turn signal switch)Refer to XX-XX, "*****"
.
Combination meterMonitors engine running status and forwards that information to the BCM via CAN
communication lines.
Page 3020 of 5883
FRONT FOG LAMP
EXL-19
< FUNCTION DIAGNOSIS >
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FRONT FOG LAMP
System DiagramINFOID:0000000001523237
System DescriptionINFOID:0000000001523238
The BCM (Body Control Module) controls front fog lamp operation based on input from the lighting switch
(combination switch). The BCM requests (via CAN communication lines) the IPDM E/R (Intelligent Power Dis-
tribution Module Engine Room) to activate the integrated front fog lamp relay and requests the combination
meter to illuminate the front fog lamp light.
Component Parts LocationINFOID:0000000001523239
AWLIA0037GB
1. IPDM E/R E46, E47, E48 2. BCM M16, M17, M18, M19 (view with
glove box removed)3. Combination switch M28
4. Combination meter M24
WKIA5469E
Page 3021 of 5883
EXL-20
< FUNCTION DIAGNOSIS >
FRONT FOG LAMP
Component Description
INFOID:0000000001523240
Part Description
BCM Monitors the combination switch position.
Requests the IPDM E/R (via CAN communication lines) to actuate the front fog lamp
relay.
Requests the combination meter (via CAN communication lines) to turn the front fog
lamp indicator lamp ON.
IPDM E/RControls the integrated front fog lamp relay based on input from the BCM via the CAN
communication lines.
Combination switch
(Lighting & turn signal switch)Refer to BCS-9, "
System Description".
Combination meter
(front fog lamp indicator lamp)Controls the front fog lamp indicator during front fog lamp operation based on input
from the BCM via the CAN communication lines.
Page 3022 of 5883

REAR FOG LAMP
EXL-21
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REAR FOG LAMP
System DiagramINFOID:0000000001527666
System DescriptionINFOID:0000000001527667
The BCM (Body Control Module) controls rear fog lamp operation based on input from the lighting switch
(combination switch). When the lighting switch is in the 1st or 2nd position or auto position and the rear fog
lamp switch is ON, the BCM outputs battery voltage to the rear fog lamps. The BCM sends a request signal to
the combination meter via CAN communication lines to illuminate the rear fog lamp indicator.
Component Parts LocationINFOID:0000000001527668
Component DescriptionINFOID:0000000001527669
AWLIA0030GB
1. BCM M16, M17, M18, M19 (view with
glove box removed)2. Combination switch M28 3. Combination meter M24
AWLIA0033GB
Part Description
BCM Monitors the combination switch position.
Outputs battery voltage to operate the rear fog lamps.
Requests the combination meter (via CAN communication lines) to turn the rear fog
lamp indicator lamp ON.
Combination switch
(Lighting & turn signal switch)Refer to BCS-9, "
System Description".
Combination meter
(rear fog lamp indicator lamp)Controls the rear fog lamp indicator during rear fog lamp operation based on input from
the BCM over the CAN communication lines.
Page 3023 of 5883
EXL-22
< FUNCTION DIAGNOSIS >
TURN SIGNAL AND HAZARD WARNING LAMPS
TURN SIGNAL AND HAZARD WARNING LAMPS
System DiagramINFOID:0000000001523241
System DescriptionINFOID:0000000001523242
The BCM (Body Control Module) controls turn signal lamp and hazard warning lamp operation based on input
from the combination switch. The combination meter operates the turn RH and turn LH indicators based on
input from the BCM via the CAN communication lines.
Component Parts LocationINFOID:0000000001523243
AWLIA0006GB
1. BCM M16, M17, M18, M19 (view with
glove box removed)2. Hazard switch M55 3. Combination switch M28
4. Combination meter M24
AWLIA0034GB
Page 3024 of 5883
TURN SIGNAL AND HAZARD WARNING LAMPS
EXL-23
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Component DescriptionINFOID:0000000001523244
Part Description
BCM Monitors the combination switch position.
Monitors hazard switch position.
Controls flasher output to the front, side and rear turn signals based on inputs from
the combination and hazard switches.
Requests the combination meter (via CAN communication lines) to turn the turn RH
and turn LH indicator lamps ON.
Combination switch
(Lighting & turn signal switch)Refer to BCS-9, "
System Description".
Combination meter
(turn LH and turn RH indicator lamp)Controls the front fog lamp indicator during front fog lamp operation based on input
from the BCM via the CAN communication lines.