Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 671
LI-7
Turn Signal Light and Hazard Light System
LIGHTING SYSTEM
5. Turn Signal Light and Hazard
Light System
A: WIRING DIAGRAM
Refer to “Turn Signal Light and Hazard Light Sys-
tem” in WI section. <Ref. to WI-103, WIRING DIA-
GRAM, Turn Signal Light and Hazard Light
B: INSPECTION
1. TURN SIGNAL SWITCH
Measure the resistance between turn signal switch
terminals. <Ref. to LI-11, INSPECTION, Combina-
2. HAZARD SWITCH
1) Measure the resistance between hazard switch
terminals.
2) If the result of the inspection is not at the stan-
dard value, replace the hazard switch.
3. TURN SIGNAL AND HAZARD MODULE
1) Connect the battery and turn signal light bulb to
the module. The module is properly functioning if it
blinks when power is supplied to the circuit.
2) Replace the turn signal & hazard module if it is
found defective.
C: NOTE
For operation procedures of each component of the
turn signal and hazard light system, refer to the re-
spective sections.
• Rear combination light assembly: <Ref. to LI-25,
Rear Combination Light Assembly.>
• Side turn signal light assembly: <Ref. to LI-24,
Side Turn Signal Light Assembly.>
• Front turn signal light bulb: <Ref. to LI-19, Front
• Rear turn signal light bulb: <Ref. to LI-27, Rear
• Combination switch (light): <Ref. to LI-11, Com-
• Combination base switch: <Ref. to LI-14, Combi-
Switch position
Terminal No.
Specification
OFF
2 and 3
1 MΩ or more
ON
Less than 1 Ω
LI-00799
4 3 2 1
LI-00262
3
2 1
8 7 6 5 4
LI-8
Back-up Light System
LIGHTING SYSTEM
6. Back-up Light System
A: WIRING DIAGRAM
Refer to “Back-up Light System” in WI section.
<Ref. to WI-95, WIRING DIAGRAM, Back-up Light
B: INSPECTION
1. BACK-UP LIGHT SWITCH
1) Measure the resistance between back-up light
switch terminals.
2) Replace the back-up light switch if the inspection
result is not within the standard value.
C: NOTE
For operation procedures of each component of the
back-up light system, refer to the respective sec-
tion.
• Rear combination light assembly: <Ref. to LI-25,
Rear Combination Light Assembly.>
• Back-up light bulb: <Ref. to LI-30, Back-up Light
Switch position
Terminal No.
Specification
When shift lever is
set in reverse
position
1 and 2
Less than 1 Ω
Other positions
1 MΩ or more
LI-00263
2 1
LI-9
Stop Light System
LIGHTING SYSTEM
7. Stop Light System
A: WIRING DIAGRAM
Refer to “Stop Light System” in WI section. <Ref. to
WI-96, WIRING DIAGRAM, Stop Light System.>
B: INSPECTION
1. STOP LIGHT SWITCH
1) Measure the resistance between stop light
switch terminals.
• 5 door model
• 4 door model
2) Replace the stop light switch if the inspection re-
sult is not within the standard value.
C: NOTE
For operation procedures of each component of the
stop light system, refer to the respective section.
• Rear combination light assembly: <Ref. to LI-25,
Rear Combination Light Assembly.>
• Tail light/stop light bulb: <Ref. to LI-26, Tail/Stop
• High-mounted stop light: <Ref. to LI-32, High-
Switch position
Terminal No.
Specification
When brake pedal
is depressed
5 door model:
1 and 2
4 door model:
3 and 4
Less than 1 Ω
When brake pedal
is released
1 MΩ or more
3
4
1
2
LI-00840
3
4
1
2
LI-00841
LI-10
Room Light System
LIGHTING SYSTEM
8. Room Light System
A: WIRING DIAGRAM
Refer to “Interior Light System” in WI section. <Ref.
to WI-106, WIRING DIAGRAM, Interior Light Sys-
B: INSPECTION
1. DOOR SWITCH
1) Measure the resistance between door switch ter-
minals.
2) Replace the door switch if the inspection result is
not within the standard value.
2. REAR GATE LATCH SWITCH
1) Measure the resistance between rear gate latch
switch terminals.
2) If the inspection result is not within the standard
value, replace the rear gate latch and actuator as-
sembly.
3. TRUNK LID LATCH SWITCH
1) Measure the resistance between trunk lid latch
switch terminals.
2) If the inspection result is not within the standard
value, replace the trunk lid latch and actuator as-
sembly.
C: NOTE
For operation procedures of each component of the
room light system, refer to the respective section.
• Spot map light: <Ref. to LI-33, Spot Map Light.>
• Room light: <Ref. to LI-34, Room Light.>
• Luggage room light: <Ref. to LI-35, Luggage
• Trunk room light: <Ref. to LI-36, Trunk Room
• Door switch: <Ref. to LI-41, Door Switch.>
• Ignition switch illumination: <Ref. to LI-37, Igni-
Switch position
Terminal No.
Specification
When door is
opened
1 and 3
Less than 1 Ω
When door is
closed
1 MΩ or more
Switch position
Terminal No.
Standard value
When rear gate is
opened
3 and 4
Less than 1 Ω
When rear gate is
closed
1 MΩ or more
1
2
3
LI-00007
LI-00947
4 3 2 1
Switch position
Terminal No.
Standard value
When trunk lid is
opened
1 and 3
Less than 1 Ω
When trunk lid is
closed
1 MΩ or more
LI-00277
1
2
3
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