Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 670
LI-3
General Description
LIGHTING SYSTEM
C: PREPARATION TOOL
1. SPECIAL TOOL
2. GENERAL TOOL
ILLUSTRATION
TOOL NUMBER
DESCRIPTION
REMARKS
1B022XU0
SUBARU SELECT
MONITOR III KIT
Used for troubleshooting the electrical system.
TOOL NAME
REMARKS
Circuit tester
Used for measuring resistance and voltage.
ST1B022XU0
LI-4
Headlight and Tail Light System
LIGHTING SYSTEM
2. Headlight and Tail Light Sys-
tem
A: WIRING DIAGRAM
1. HALOGEN TYPE HEADLIGHT
Refer to “Headlight System” in WI section. <Ref. to
WI-90, WIRING DIAGRAM, Headlight System.>
2. HID TYPE HEADLIGHT
Refer to “Headlight System” in WI section. <Ref. to
WI-90, WIRING DIAGRAM, Headlight System.>
3. CLEARANCE LIGHT AND ILLUMINA-
TION LIGHT
Refer to “Clearance Light and Illumination Light
System” in WI section. <Ref. to WI-98, WIRING DI-
AGRAM, Clearance Light and Illumination Light
B: INSPECTION
1. LIGHTING SWITCH
Measure the resistance between lighting switch ter-
minals. <Ref. to LI-11, INSPECTION, Combination
2. DIMMER AND PASSING SWITCH
Measure the resistance between dimmer & passing
switch terminals. <Ref. to LI-11, INSPECTION,
3. HEADLIGHT RELAY
1) Connect terminal No. 4 to the battery positive
terminal and the terminal No. 3 to the battery neg-
ative terminal, and check the resistance value be-
tween the headlight relay terminals.
2) Replace the headlight relay if the inspection re-
sult is not within the standard value.
4. TAIL AND ILLUMINATION RELAY
1) Connect terminal No. 4 to the battery positive
terminal and terminal No. 3 to the battery ground
terminal, and check the resistance between tail and
illumination relay terminals.
2) If the result of the inspection is not at the stan-
dard value, replace the tail & illumination relay.
C: NOTE
For operation procedures of each component of the
headlight system, refer to the respective section.
• Headlight Assembly: <Ref. to LI-15, Headlight
• Headlight bulb: <Ref. to LI-17, Headlight Bulb.>
• Combination switch (light): <Ref. to LI-11, Com-
• Combination base switch: <Ref. to LI-14, Combi-
• License plate light: <Ref. to LI-31, License Plate
• Front side marker light bulb: <Ref. to LI-20, Front
• Rear combination light assembly: <Ref. to LI-25,
Rear Combination Light Assembly.>
• Rear finisher light assembly: <Ref. to LI-29, Rear
• Tail light/stop light bulb: <Ref. to LI-26, Tail/Stop
• Rear side marker light bulb: <Ref. to LI-28, Rear
Continuity
Terminal No.
Specification
Yes
1 and 2
Less than 1 Ω
No
1 MΩ or more
LI-00001
(1)
(2)
(1)
(4)
(2)
(3)
(3)
(4)
Continuity
Terminal No.
Specification
Yes
1 and 2
Less than 1 Ω
No
1 MΩ or more
LI-00001
(1)
(2)
(1)
(4)
(2)
(3)
(3)
(4)
LI-5
Day Time Running Light System
LIGHTING SYSTEM
3. Day Time Running Light System
A: WIRING DIAGRAM
Refer to “Headlight System” in WI section. <Ref. to WI-90, WIRING DIAGRAM, Headlight System.>
B: INSPECTION
1. DAYTIME RUNNING LIGHT MODULE CHECK
2. DAYTIME RUNNING LIGHT RELAY
1) Check the resistance between the daytime running relay terminals when connecting terminal No. 3 to the
battery positive terminal and terminal No. 5 to the battery ground terminal.
2) Replace the daytime running light relay if the inspection result is not within the standard value.
Step
Check
Yes
No
1
CHECK DTC.
1) Connect the Subaru Select Monitor.
2) Read the DTC of the integrated unit.
Is DTC displayed?
Perform the diag-
nosis according to
DTC.
2
CHECK INPUT SIGNAL.
1) Display the current data of the integrated
unit.
2) Check the following input signals.
(1) Parking brake switch
(2) Shift position
(3) Light 2
Is the input signal normal?
Check the defec-
tive part.
3
CHECK RELAY.
Check the daytime running light relay.
Is the relay OK?
Replace the relay.
4
CHECK HARNESS.
Is the harness normal?
Replace the inte-
grated unit.
Repair the har-
ness.
LI-00829
(7)
(6)
(7)
(4)
(6)
(3)
(3)
(4)
(5)
(5)
Continuity
Terminal No.
Specification
Yes
7 and 6
Less than 1 Ω
No
1 MΩ or more
Yes
7 and 4
1 MΩ or more
No
Less than 1 Ω
LI-6
Front Fog Light System
LIGHTING SYSTEM
4. Front Fog Light System
A: WIRING DIAGRAM
Refer to “Front Fog Light System” in WI section.
<Ref. to WI-94, WIRING DIAGRAM, Front Fog
B: INSPECTION
1. FRONT FOG LIGHT SWITCH
Measure the resistance between front fog light
switch terminals. <Ref. to LI-11, INSPECTION,
2. FRONT FOG LIGHT RELAY
1) Connect terminal No. 4 to the battery positive
terminal and the terminal No. 3 to the battery neg-
ative terminal, and check the resistance value be-
tween the front fog light relay terminals.
2) If the result of the inspection is not at the stan-
dard value, replace the front fog light relay.
C: NOTE
For operation procedures of each component of the
front fog light system, refer to the respective sec-
tion.
• Front fog light assembly: <Ref. to LI-21, Front
• Front fog light bulb: <Ref. to LI-23, Front Fog
• Combination switch (light): <Ref. to LI-11, Com-
• Combination base switch: <Ref. to LI-14, Combi-
Continuity
Terminal No.
Specification
Yes
1 and 2
Less than 1 Ω
No
1 MΩ or more
LI-00001
(1)
(2)
(1)
(4)
(2)
(3)
(3)
(4)
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