Acura RL (1996-2004 year). Instruction — page 83

110-10

Headlights and Fog Lights

LEFT

HEADLIGHT

C328

PHOTO 72
VIEW 48

C305

PHOTO 36
VIEW 20

HEAD-
LIGHT
RELAY

PHOTO 35

FUSE 31

BATTERY
120A

ON
INDICATOR
LIGHT

C306

PHOTO 36
VIEW 36

6

RIGHT

HEAD-

LIGHT

3

1

RED/BLU

’96-’98 USA

2

RED/GRN

RED/GRN

C201

PHOTO 112
VIEW 71

16

RED/GRN

C326

PHOTO 73
VIEW 72

5

RED/GRN

RED/GRN

ORN

C202

PHOTO 112
VIEW 27

2

ORN

C326

PHOTO 73
VIEW 72

15

3

ORN

To page
110-11.

UNDER-HOOD
FUSE/RELAY
BOX

PHOTO 33

C305

PHOTO 36
VIEW 20

6

3

1

RED/BLU

2

RED/YEL

ORN

8

See Ground
Distribution,
page 14-12.

G402

PHOTO 106

BLK

BLK

FOG
LIGHT
SWITCH
LIGHT

4

OFF

ON

FOG LIGHT

SWITCH

PHOTO 159

See Dash
and Console
Lights

2

RED

RED/BLU

RED/YEL

5

1

See Dash and
Console Lights

3

RED/

BLU

C325

PHOTO 73
VIEW 76

1

9

FOG
LIGHT
RELAY

PHOTO 26

BLU/

RED

8

FUSE 53

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

PHOTO 31

See Ground
Distribution,
page 14-2.

G201

PHOTO 19

C202

PHOTO 112
VIEW 27

8

C325

PHOTO 73
VIEW 76

3

LT GRN

LT GRN

LT GRN

RED/BLU

(

*

3)

5

)

BRN/YEL

BRN/YEL

C307

PHOTO 37
VIEW 47

2

UNDER-
HOOD
RELAY
BOX C

PHOTO 23

RED/BLU

RED/BLU

RED/BLU

RED/BLU

See Power
Distribution,
page 10-1.

FUSE 45

R

15A

HEAD-
LIGHT

FUSE 46

L

15A

HEAD-
LIGHT

HIGH

LOW

HIGH

LOW

ORN

*

= ’98

HOT AT ALL TIMES

2004 American Honda Motor Co., Inc.

Circuit Index

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How the Circuit Works

How the Circuit Works

+

110-11

Headlights and Fog Lights

’96-’98 USA

DIMMER
RELAY

PHOTO 35

5

C305

PHOTO 36
VIEW 20

7

7

C306

PHOTO 36
VIEW 36

UNDER-HOOD
FUSE/RELAY
BOX

PHOTO 33

COMBINATION

LIGHT SWITCH

VIEW 116

3

2

BLU/RED

See
Security
System

9

8

3

BLU/RED

From page 110-10.

GAUGE

ASSEMBLY

PHOTO 71

VIEW 113

B

B

HIGH BEAM
INDICATOR
LIGHT

20

RED/BLU

16

C430

PHOTO 82
VIEW 51

10

RED/BLU

RED/GRN

C430

PHOTO 82
VIEW 51

8

RED/GRN

Headlight Switch

Flash-to-
pass
Switch

Dimmer
Switch

OFF

ON

OFF

ON

LO

HI

HEAD

OFF

PARK

C326

PHOTO 73
VIEW 72

12

BLU/RED

BLU/RED

See Ground
Distribution,
page 14-7.

G301

PHOTO 31

BLK

C326

PHOTO 73
VIEW 72

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

PHOTO 150
VIEW 63

5

BLU/RED

BLU/RED

C410

PHOTO 79
VIEW 50

9

5

13

GRN/YEL

GRN/YEL

C409

PHOTO 79
VIEW 61

3

C415

PHOTO 81
VIEW 77

BLU/

RED

BLK

5

Headlight
relay
control

Taillight
relay
control

Head-
light
switch
input

See
Headlight
Switch

G401

PHOTO 79

See Ground
Distribution,
page 14-8.

BLK

BLK

C415

PHOTO 81
VIEW 77

4

BLK

2

BRN/WHT

(Not used)

1

BLK

2004 American Honda Motor Co., Inc.

Circuit Index

Circuit Index

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How the Circuit Works

How the Circuit Works

110-12

Headlights and Fog Lights

YEL/BLK

UNDER-DASH
FUSE/RELAY
BOX

PHOTO 75

See Power
Distribution,
page 10-7.

FUSE 19

R/C MIRROR
7.5A

FUSE 20

ECU
20A

UNDER-HOOD
FUSE/RELAY
BOX

PHOTO 33

FUSE 56

BACK UP
RADIO
7.5A

C403

PHOTO 74
VIEW 90

18

C651

PHOTO 75
VIEW 74

7

BLK/YEL

3

AUTOMATIC
LIGHTING
CONTROL
UNIT

PHOTO 150
VIEW 63

2

10

C307

PHOTO 37
VIEW 47

7

BLK/YEL

Ignition
input

9

8

12

GRN/BLU

DRIVER’S
DOOR
LATCH

PHOTO 142

7

WHT/YEL

GRN/BLU

’96-’98 USA

See Ground
Distribution,
page 14-9.

BLK

G401

PHOTO 79

8

C744

PHOTO 142
VIEW 33

BLK

Door
Switch
Closed with
door open.

3

C744

PHOTO 142
VIEW 33

GRN/BLU

See Security
System

10

C412

PHOTO 110
VIEW 96

GRN/BLU

GRN/BLU

See Safety
Indicator

GRN/BLU

See Power
Distribution,
page 10-9.

BLK/YEL

WHT/YEL

12

C409

PHOTO 79
VIEW 61

4

C327

PHOTO 73
VIEW 89

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

PHOTO 79

BLK

G651

PHOTO 133

BLK

AUTOMATIC
LIGHTING
SENSOR

PHOTO 69

5

3

BRN

BRN

4

2

YEL/GRN

YEL/GRN

1

C504

PHOTO 83
VIEW 68

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

PHOTO 79
VIEW 61

YEL/BLK

HOT IN ON OR START

HOT IN ON

HOT AT ALL TIMES

2004 American Honda Motor Co., Inc.

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How the Circuit Works

How the Circuit Works

+

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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