Acura RL (1996-2004 year). Instruction — page 84

110-14

Headlights and Fog Lights

See Ground
Distribution,
page 14-2.

C328

PHOTO
72
VIEW
48

C305

PHOTO 36
VIEW 20

HEAD-
LIGHT
LOW
BEAM
RELAY

PHOTO 35

FUSE 31

BATTERY
120A

ON
INDICATOR
LIGHT

‘99-’04 USA

2

1

RED/BLU

2

RED/YEL

BLK

8

LEFT
HEADLIGHT
1= Low
2= High

PHOTO 167

See Ground
Distribution,
page 14-12.

BLK

BLK

FOG
LIGHT
SWITCH
LIGHT

OFF

ON

FOG LIGHT
SWITCH

PHOTO 159
VIEW 125
(Navigation)

See Dash and
Console Lights

RED

RED/BLU

RED/BLK

See Dash and
Console Lights

RED/BLU

C325

PHOTO 73
VIEW 76

1

11

FOG
LIGHT
RELAY

PHOTO 26

BLU/

RED

8

FUSE 53

FR FOG
20A

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

G201

PHOTO 19

C202

PHOTO 112
VIEW 27

8

C325

PHOTO 73
VIEW 76

3

LT GRN

LT GRN

LT GRN

RED/

BLU

3

BRN/YEL

BRN/YEL

C307

PHOTO 37
VIEW 47

2

UNDER-
HOOD
RELAY
BOX C

PHOTO 23

RED/BLU

See Power
Distribution,
page 10-1.

FUSE 46

L

20A

HEADLIGHT
LOW

*

= Navigation

FUSE 48

L

10A

HEADLIGHT
HIGH

3

RED/YEL

Inverter

Igniter

2

1

3

C306

PHOTO 36
VIEW 36

See Ground
Distribution,
page 14-6.

BLK

G301

PHOTO 31

GAUGE

ASSEMBLY

PHOTO 71

(’99-’03)

PHOTO 212

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/BLK

4

)

(

*

5)

2

)

(

*

3)

3

)

(

*

4)

1

)

(

*

2)

5

)

(

*

6)

RED/BLU

B

A

A

B

RED/

BLU

BLK

G402

PHOTO 106

HOT AT ALL TIMES

See
Gauge
Assembly

2004 American Honda Motor Co., Inc.

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+

110-15

Headlights and Fog Lights

1

‘99-’04 USA

5

7

3

C301

PHOTO 36

UNDER-
HOOD
FUSE/
RELAY
BOX

PHOTO 33

COMBINATION
LIGHT SWITCH

VIEW 116

3

2

BLU/RED

5

8

3

BLU/RED

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

BLK

9

G401

PHOTO 79

See Ground
Distribution,
page 14-10.

BLK

BLK

C415

PHOTO 81
VIEW 77

4

BLK

2

BRN/

WHT

1

BLK

DIMMER
RELAY

PHOTO 35

FUSE 45

R

20A

HEAD-
LIGHT
LOW

FUSE 49

R

10A

HEAD-
LIGHT
HIGH

From
page
110-16.

To page
110-16.

BLU/RED

2

2

RED/GRN

BLK

6

RIGHT
HEAD-
LIGHT
1= LOW
2= HIGH

PHOTO 167

3

RED/BLK

Inverter

Igniter

2

1

9

7

C306

PHOTO 36
VIEW 36

C305

PHOTO
36
VIEW 20

(Not
used)

HEAD-
LIGHT
DIODE

PHOTO 169

PNK

See
Security
System

PNK

BLU/RED

C415

PHOTO 81
VIEW 77

6

2

C326

PHOTO 73
VIEW 72

C201

PHOTO 112
VIEW 71

RED/BLK

RED/BLK

See Ground
Distribution,
page. 14-2.

BLK

G201

PHOTO 19

3

RED/BLU

RED/BLU

6

BLU/

RED

PNK

HEADLIGHT
HIGH BEAM
RELAY

PHOTO 34

5

RED/GRN

16

RED/

GRN

RED/BLK

C202

PHOTO 112
VIEW 27

C202

PHOTO 112
VIEW 27

2

1

B

A

B

A

(Not used)

Flash-
to-
pass
Switch

’99-’03

2004 American Honda Motor Co., Inc.

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110-16

Headlights and Fog Lights

(

**

9)

4

See Power
Distribution,
page 10-7.

See Ground
Distribution,
page 14-5.

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

Ignition
input

9

8

WHT/YEL

‘99-’04 USA

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 10-9.

See Ground
Distribution,
page 14-4.

BLK

G251

PHOTO 46

BLK

G651

PHOTO 133

BLK

See Ground
Distribution,
page 14-16.

Ignition
input

Battery
input

Ground

Ground

12

GRN/BLU

DRIVER’S
DOOR
LATCH

PHOTO 142

GRN/BLU

BLK

G251

PHOTO 46

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

BLK

GRN/BLU

Driver’s door
switch input

COMBINATION

LIGHT SWITCH

VIEW 116

Headlight Switch

6

7

RED/GRN

HEAD

OFF

PARK

RED/GRN

AUTO

5

6

GRN/YEL

HEAD

OFF

PARK

AUTO

14

RED/GRN

5

BLU/RED

BLU/RED

C410

PHOTO 79
VIEW 50

9

(

**

8)

5

13

GRN/YEL

GRN/YEL

C409

PHOTO 79
VIEW 61

3

C415

PHOTO 81
VIEW 77

Headlight
relay
control

Taillight
relay
control

Headlight
switch input

See
Headlight
Switch

To page
110-15.

RED/GRN

7

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

C511

Automatic lighting
sensor input

From page
110-15.

GRN/BLU

C409

PHOTO 79
VIEW 61

(C414

**

)

PHOTO 83
VIEW 91

GRN/

BLU

See
Safety
Indicator

BRN

YEL/GRN

RED/YEL

**

= ’02-’04 USA

YEL/BLK

HOT IN ON OR START

HOT IN ON

HOT AT ALL TIMES

2004 American Honda Motor Co., Inc.

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110-17

Headlights and Fog Lights

How the Circuit Works

WARNING

A transient high tension (25,000 V) occurs at the
bulb sockets of the high intensity discharge
(HID) lamps when the combination light switch
is turned ON. It may cause serious electrical
shock or electrocution if you do not observe the
cautions below.

CAUTION

Never turn on the combination light switch
before fitting the HID bulbs to their bulb
sockets and completing the reassembly of
the headlight assembly.

Do not service the headlight assembly in wet
conditions, such as rain or snow, near a
sprinkler system, or when your hands are
wet to prevent electrocution.

Do not touch the surface of the HID bulbs
with your bare hands and do not stain it with
any oils or fats.

Do not disassemble the inverter unit and the
igniter unit.

Do not turn on the HID bulb by using a power
source other than the battery mounted on the
vehicle.

Low Beams

The headlight low beam and high beam relays
receive 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 and lighting diode to the coils of
the headlight low beam and high beam relays. The
relays are then energized, applying battery voltage
to the left and right low and high beam headlights
through fuses 45, 46 and 48, 49 respectively. The
low beam bulbs come on because they are
individually grounded by G301 and G201. 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 and lighting diode to the coils of the headlight
low beam and high beam relays and through the
RED/BLU wire to the coil of the dimmer relay. This
energizes the headlight low beam and high beam
relays, 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 lighting diode and ground
the headlight low beam and high beam relays. The
relays energize and cause 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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