Acura RL (1996-2004 year). Manual — part 83
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110-10
Headlights and Fog Lights
LEFT
HEADLIGHT
C328
C305
HEAD-
LIGHT
RELAY
BATTERY
120A
ON
INDICATOR
LIGHT
C306
6
RIGHT
HEAD-
LIGHT
3
1
RED/BLU
’96-’98 USA
2
RED/GRN
RED/GRN
C201
16
RED/GRN
C326
5
RED/GRN
ORN
C202
2
ORN
C326
15
3
ORN
To page
110-11.
UNDER-HOOD
FUSE/RELAY
BOX
C305
6
3
1
RED/BLU
2
RED/YEL
ORN
8
See Ground
Distribution,
page 14-12.
G402
BLK
BLK
FOG
LIGHT
SWITCH
LIGHT
4
OFF
ON
FOG LIGHT
SWITCH
2
RED
RED/BLU
RED/YEL
5
1
3
RED/
BLU
C325
1
9
FOG
LIGHT
RELAY
BLU/
RED
8
FR FOG
15A
3
)
(
*
5)
2
1
BLK
3
2
LT GRN
LEFT
FOG
LIGHT
BLK
3
2
RIGHT
FOG
LIGHT
See Ground
Distribution,
page 14-7.
G301
See Ground
Distribution,
page 14-2.
G201
C202
8
C325
3
LT GRN
LT GRN
LT GRN
RED/BLU
(
*
3)
5
)
BRN/YEL
BRN/YEL
C307
2
UNDER-
HOOD
RELAY
BOX C
RED/BLU
RED/BLU
RED/BLU
RED/BLU
See Power
Distribution,
page 10-1.
R
15A
HEAD-
LIGHT
L
15A
HEAD-
LIGHT
HIGH
LOW
HIGH
LOW
ORN
*
= ’98
HOT AT ALL TIMES
2004 American Honda Motor Co., Inc.
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+
–
110-11
Headlights and Fog Lights
’96-’98 USA
DIMMER
RELAY
5
C305
7
7
C306
UNDER-HOOD
FUSE/RELAY
BOX
COMBINATION
LIGHT SWITCH
3
2
BLU/RED
9
8
3
BLU/RED
From page 110-10.
GAUGE
ASSEMBLY
B
B
HIGH BEAM
INDICATOR
LIGHT
20
RED/BLU
16
C430
10
RED/BLU
RED/GRN
C430
8
Headlight Switch
Flash-to-
pass
Switch
Dimmer
Switch
OFF
ON
OFF
ON
LO
HI
HEAD
OFF
PARK
C326
12
BLU/RED
BLU/RED
See Ground
Distribution,
page 14-7.
G301
BLK
C326
13
RED/BLU
RED/BLU
RED/BLU
AUTO
6
7
RED/GRN
HEAD
OFF
PARK
RED/GRN
AUTO
5
6
GRN/YEL
HEAD
OFF
PARK
AUTO
14
RED/GRN
RED/GRN
AUTO-
MATIC
LIGHTING
CONTROL
UNIT
5
BLU/RED
BLU/RED
C410
9
5
13
GRN/YEL
GRN/YEL
C409
3
C415
BLU/
RED
BLK
5
Headlight
relay
control
Taillight
relay
control
Head-
light
switch
input
G401
See Ground
Distribution,
page 14-8.
BLK
BLK
C415
4
BLK
2
BRN/WHT
(Not used)
1
BLK
2004 American Honda Motor Co., Inc.
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110-12
Headlights and Fog Lights
YEL/BLK
UNDER-DASH
FUSE/RELAY
BOX
See Power
Distribution,
page 10-7.
R/C MIRROR
7.5A
ECU
20A
UNDER-HOOD
FUSE/RELAY
BOX
BACK UP
RADIO
7.5A
C403
18
C651
7
BLK/YEL
3
AUTOMATIC
LIGHTING
CONTROL
UNIT
2
10
C307
7
BLK/YEL
Ignition
input
9
8
12
GRN/BLU
DRIVER’S
DOOR
LATCH
7
WHT/YEL
GRN/BLU
’96-’98 USA
See Ground
Distribution,
page 14-9.
BLK
G401
8
C744
BLK
Door
Switch
Closed with
door open.
3
C744
GRN/BLU
10
C412
GRN/BLU
GRN/BLU
GRN/BLU
See Power
Distribution,
page 10-9.
BLK/YEL
WHT/YEL
12
C409
4
C327
WHT/YEL
See Power
Distribution,
page 10-15.
WHT/YEL
WHT/YEL
WHT/YEL
WHT/YEL
See Power
Distribution,
page 10-8.
See Ground
Distribution,
page 14-8.
BLK
G401
BLK
G651
BLK
AUTOMATIC
LIGHTING
SENSOR
5
3
BRN
BRN
4
2
YEL/GRN
YEL/GRN
1
C504
6
1
RED/YEL
RED/YEL
7
See Ground
Distribution,
page 14-16.
C511
BLK
GRN/BLU
Ignition
input
Battery
input
Ground
Driver’s door
switch input
Ground
Automatic lighting
sensor input
See Power
Distribution,
page 10-7.
BRN
YEL/GRN
RED/YEL
GRN/BLU
4
C409
YEL/BLK
HOT IN ON OR START
HOT IN ON
HOT AT ALL TIMES
2004 American Honda Motor Co., Inc.
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–
110-13
Headlights and Fog Lights
How the Circuit Works
Low Beams
The headlight relay receives battery voltage at all
times. When you turn the headlight switch to the
HEAD position with the dimmer switch in LOW,
ground is applied through the BLU/RED wire to the
coil of the headlight relay. The relay is then
energized, applying battery voltage to the left and
right high and low beam headlights through fuses
45 and 46. The low beam bulbs come on because
the opposite terminal is tied to ground through the
dimmer relay. The high beams and indicator remain
off because their ground path is interrupted by the
deenergized dimmer relay.
High Beams
When you pull the dimmer switch to HIGH with the
low beams already on, ground is applied to the
dimmer relay from the dimmer switch. This
energizes the dimmer relay, applying ground to the
high beam bulbs and high beam indicator, which
turns on the high beams and indicator light. The low
beams go off because their ground path is
interrupted by the activated dimmer relay.
Flash-to-Pass
When you hold the flash-to-pass switch in the ON
position, ground is applied through the BLU/RED
wire to the coil of the headlight relay and through
the RED/BLU wire to the coil of the dimmer relay.
This energizes the headlight relay, applying battery
voltage to the low and high beam bulbs and to the
dimmer relay. As the high beam bulbs receive
battery voltage, the dimmer relay is energized,
applying ground to the high beam bulbs and high
beam indicator, which turns on the high beams and
indicator light. The low beams go off because their
ground path is interrupted by the activated dimmer
relay.
Automatic Lighting
When you move the headlight switch to the AUTO
position, the automatic lighting control unit will
automatically turn on the headlights.
The automatic lighting control unit receives battery
voltage through fuse 56 at all times and receives
battery voltage through fuse 20 with the ignition
switch in ON (ll) and START (lll). When the ignition
switch is turned to ON (ll), the automatic lighting
control unit receives an “ignition on” signal through
fuse 19. When the headlight switch is in the AUTO
position with the driver’s door closed, and if the
automatic lighting sensor detects low ambient light,
the automatic lighting control unit will apply ground
to the BLU/RED wire and ground the headlight
relay. The relay energizes and causes the high or
low beam headlights to come on, depending on the
position of the dimmer switch. The headlights will
operate as if they had been turned on with the
headlight switch. When the driver’s door is open,
ground is applied to the automatic lighting control
unit through the GRN/BLU wire. When the control
unit receives this ground signal, it removes ground
from the headlight relay and causes the headlights
to turn off. The automatic lighting control unit will
also turn off the headlights if the ambient light levels
rise to daylight conditions or if the headlight switch
is moved out of the AUTO position.
Refer to the Service Manual (Section 23, Electrical) for
specific tests and troubleshooting procedures.
2004 American Honda Motor Co., Inc.
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