Park, Marker, License, and Tail Lamps
When the headlamp switch is moved to the PARK or ON position, battery voltage
is applied through CKT 9 to the left instrument panel fuse block
(LIPFB). Battery power passes through the LIPFB to both license lamps, both tail lamps,
both front park/turn lamps, both rear tail lamps, and all marker lamps through CKT 9.
The front marker and front park/turn lamps are grounded by CKT 150 through
the forward lamp ground splice pack.
Headlamps/Daytime Running Lamps (DRL)
Daytime Running Lamps: Daytime running lamps (DRL) are standard
on all Saturn models. The DRL relay is located in the UHFB. The coil side of the DRL
relay receives battery voltage through the left headlamp fuse. Battery voltage flows
through the DRL relay coil to the body control module through CKT 592. The
BCM will ground CKT 592 when DRL is required. The body control module (BCM)
uses ignition, park lamp, headlamp, high beam and park brake inputs to control the
DRL. The DRL will be enabled anytime the ignition is in the RUN position, the headlamp
switch is Off and the park brake switch is Off.
Battery voltage is supplied through the left headlamp fuse to CKT 40
to the left high beam lamp. Voltage flows through the left high beam lamp to the IPFB
through CKT 1200. Voltage flows to the right DRL relay located in the IPFB
through CKT 593. The BCM provides ground to CKT 592 to energize the
relay. Voltage flows through the closed contacts of the DRL relay to ground through
CKT 150 to the forward lamp ground splice pack. This circuit results in both
high beam lamps being connected in series, which allows the high beam lights to operate
at half brightness.
The BCM will turn Off the DRL relay when it sees any of the following inputs:
• | Ignition not in the RUN position |
The BCM uses the high beam input to determine if the DRL functions are working.
If the DRL functions are not operating properly a diagnostic trouble code may be set.
Refer to diagnosis in this section for further information.
Headlamps: Battery power is applied to the low and high beam
elements of the left headlamp assembly by the left headlamp fuse through CKT 40.
Battery power is applied to the low beam element of the right headlamp assembly by
the right headlamp fuse through CKT 140. Battery power is applied to the right
high beam element by the right headlamp fuse normally closed (DRL relay NOT energized)
contacts of the DRL relay and CKT 593.
When the headlamp switch is turned to On, and the high beam switch is Off, a
ground path is provided to CKT 1201 through the headlamp switch to CKT 550.
CKT 550 is connected to the LIPFB and is grounded at the right body ground
splice pack. When the high beam switch is in the ON position, a ground path is provided
to CKT 1200 through the headlamp switch to CKT 550. CKT 550 is
connected to the LIPFB and is grounded at the right body ground splice pack. This
same operation is also true when the flash-to-pass feature is used. To operate the
flash-to-pass feature, the multifunction lever is pulled toward the driver.
Stop Lamps: Battery voltage is applied at all times to the brake
switch from the brake/park lock fuse through CKT 540. When the brake switch
is closed (brake pedal pushed down) battery voltage is applied to the LIPFB through
CKT 20. The LIPFB distributes battery voltage to the stop lamps through CKT 20.
The stop lamps are grounded by CKT 650 through the rear body ground splice
pack. The two stop lamps for the wagon are grounded by CKT 650 through the
tail lamp ground.
Turn Signals: When the ignition switch is turned to the RUN
position, battery voltage is applied to the hazard switch from the backup/turn fuse
through CKT 239. This battery voltage is then applied to the headlamp/turn
signal switch through CKT 16.
During a left hand turn, battery voltage is applied to CKT 14, which
in turn supplies voltage to the left front park turn lamp through the underhood fuse
block, to the left rear turn lamp through the left instrument panel fuse block and
the instrument cluster.
During a right hand turn, battery voltage is applied to CKT 15, which
in turn supplies voltage to the left instrument panel fuse block (LIPFB). Battery
voltage flows through the LIPFB to the right front park turn lamp through the underhood
fuse block, to the right rear turn lamp and the instrument cluster.
The front park/turn lamps ground through CKT 150 to the forward lamp
splice pack. The rear turn lamps ground through CKT 650 to the rear body splice
pack on the sedan, and the tail lamp ground on the wagon.
Fog Lamps: The fog lamp system consists of a fog lamp relay,
a fog lamp switch, and the fog lamps. Battery voltage is applied to the fog lamp relay
and the fog lamp switch through CKT 9, from the headlamp switch. The fog lamps
will only operate when the headlamp switch is in the ON or PARK position. When the
headlamp switch is in the ON or PARK position, and the fog lamp switch is pressed,
current will flow through the coil side of the fog lamp relay through CKT 317
to the fog lamp switch. Current will also flow through CKT 9 to the fog lamp
on indicator. Current flow from the fog lamp switch grounds through CKT 450
to the right body ground splice pack (with RKE) or the right body ground (w/o RKE).
When the fog lamp relay is energized, battery voltage is applied from the 10A
FOG LP fuse to CKT 34 to the fog lamps. The fog lamps ground through CKT 150
to the forward lamp ground splice pack.
Hazard Lamps: Battery voltage is always applied from the 10A
HAZARD fuse to the hazard switch through CKT 1040. When the hazard switch is
pressed, battery voltage is fed through the timing circuitry inside the hazard switch.
This pulsating voltage is fed to the right tail lamp and right front park turn lamp
through CKT 15, and the left rear tail lamp and left front park/turn lamp through
CKT 14. Both front park/turn lamps are grounded through CKT 150 at the
forward lamp splice pack, and the tail lamps are grounded through CKT 650 at
the rear compartment ground splice pack on the sedan, and the tail lamp ground on
the wagon.
Back-Up Lamps: Battery voltage is supplied to the transaxle
range switch (automatic) or the back up switch (manual) from the 10A back-up/turn
fuse in the UHFB through CKT 239. Current flows through the switch, through
CKT 24 to the back up lamps. The lamps are grounded through CKT 650
to the rear compartment ground splice pack (sedan) or rear compartment ground (wagon).