Suzuki XL7 2007 Service Manual page 2322

9B-1 Lighting Systems:
Lighting Systems
Halogen Bulb Caution
WARNING
!
Halogen bulbs contain gas under pressure. Handling a bulb improperly could cause it to shatter into
flying glass fragments. To help avoid personal injury:
• Turn off the lamp switch and allow the bulb to cool before changing the bulb.
• Leave the lamp switch OFF until the bulb change is complete.
• Always wear eye protection when changing a halogen bulb.
• Handle the bulb only by its base. Avoid touching the glass.
• Keep dirt and moisture off the bulb.
• Properly dispose of the used bulb.
• Keep halogen bulbs out of the reach of children.
Exterior Lighting Systems Description and
Operation
Exterior Lamps
The exterior lighting system consists of the following
lamps:
• The headlamps
• The daytime running lamps
• The fog lamps
• The park, tail and marker lamps
• The turn signal lamps
• The hazard lamps
• The stop lamps
• The backup lamps
PCB Relays
This vehicle is equipped with the following printed circuit
board PCB mounted relays. High Beam, Low Beam,
DRL, Fog Lamp, Park Lamp, Stop Lamp, and Horn relay.
They are directly soldered to the underhood fuseblock
circuit board. A failure of one of these relays will require
the whole underhood fuseblock to be replaced.
Headlamps
The headlamp switch is part of the turn signal
multifunction switch.
The headlamps may be turned on 2 different ways. First,
when the driver places the headlamp switch in the ON
position, for manual operation. Second, with the
headlamp switch placed in the AUTO position activating
automatic lamp control (ALC).
Precautions
General Description
The Left High Beam 10A fuse, Right High Beam 10A
fuse, Left Low Beam 10A fuse, Right Low Beam 10A
fuse, DRL 1 15A fuse, and DRL 2 15A fuse in the fuse
block - underhood, supply battery positive voltage to
both low and high beam lamps at all times. For manual
operation, when the headlamp switch is in the ON
position, the headlamp switch supplies ground directly to
the headlamps and to the body control module (BCM) on
the headlamp low or high beam signal circuit, depending
on the position of the headlamp dimmer switch. The
BCM uses this signal to determine if the conditions are
present to illuminate the daytime running lamps or park
lamps.
For ALC operation, the BCM receives a signal from the
ambient light sensor indicating a low or high ambient,
outside, light level. Under low light conditions the BCM
grounds the headlamp relay control circuit energizing the
headlamp control relay. The now closed relay supplies
ground through the headlamp switch to the headlamps
and the BCM on the headlamp low or high beam signal
circuit, depending on the position of the headlamp
dimmer switch. When the BCM grounds the headlamp
relay control circuit it also grounds the park lamp relay
control circuit illuminating the park lamps. The headlamp
relay is grounded at G203.
If the engine stalls with the headlamps in the ALC mode
under low light conditions, the headlamps will be
controlled OFF during cranking.
The conditions necessary for the BCM to activate the
ALC mode are as follows:
• The ignition switch is in the RUN position.
• The headlamps are in the AUTO position.
• The park brake is released. If the park brake is applied
after the ignition key is placed in the RUN position the
ALC is not effected.