Acura RL (1996-2004 year). Instruction — page 100

130-4

Power Door Locks/Keyless Entry

How the Circuit Works

Power Door Locks

The power door locks system includes the
passenger’s multiplex control unit, driver’s multiplex
control unit, door multiplex control unit, and keyless
receiver unit. Battery voltage is applied through fuse
44 at all times to the passenger’s multiplex control
unit and the keyless receiver unit. The passenger’s
multiplex control unit, driver’s multiplex control unit,
and door multiplex control unit communicate with
each other through the BRN/WHT D-A line,
RED/YEL A-D line, BRN/YEL door D-line, and
PNK/BLU wakeup line.

When you turn the key in the driver’s door to the
unlock position, a ground signal is sent to the door
multiplex control unit. If you hold the key in the
unlock position for more than 1 second, all doors
will unlock.

Each door has a knob switch input and a door
switch input to either the passenger’s multiplex
control unit, driver’s multiplex control unit, or door
multiplex control unit. The multiplex control units
use these inputs to control the door key cylinder
switch in each front door.

Keyless Entry

You can also unlock the doors and trunk with the
remote transmitter. When you press the UNLOCK
button on the transmitter, the driver’s door will
unlock. When you press the button again, the
other doors will unlock. The doors will relock
automatically after 30 seconds if a door is not
opened or if the key is not in the ignition switch.
If the key is in the ignition switch, the remote
transmitter will not lock the doors.

Refer to the Service Manual (Section 23, Electrical)
for specific tests and troubleshooting procedures.

2004 American Honda Motor Co., Inc.

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132

Immobilizer System

1

B

2

See Brake System
Indicator Light,
page 71 or 71-1.

See Ground
Distribution,
page 14-8.

See Power
Distribution,
page 10-15.

See Ground
Distribution,
page 14-12.

G402

PHOTO 106

BLK

‘96-‘98

IMMOBILIZER
CONTROL
UNIT

PHOTO 84
VIEW 98

FUSE 6

ECU
20A

See Power
Distribution,
page 10-2.

YEL/

BLK

3

C430

PHOTO 82
VIEW 51

BLK

5

C501

PHOTO 77
VIEW 30

1

UNDER-
DASH
FUSE/
RELAY
BOX

PHOTO 75

FUSE 56

BACK UP
RADIO
7.5A

WHT/YEL

7

C307

PHOTO 37
VIEW 47

5

BRAKE
FLUID LEVEL
SWITCH
Closed with
low fluid level.

PHOTO 39

C476

PHOTO 97
VIEW 94

21

IMMOBILIZER
SYSTEM
INDICATOR
LIGHT

See Gauge
Assembly

19

B

See Power
Distribution,
page 10-2.

STARTER
CUT
RELAY

PHOTO 78

FUSE 14

STARTER
SIGNAL
7.5A

3

IMMOBILIZER

RECEIVER

UNIT

PHOTO 86

GAUGE ASSEMBLY

PHOTO 71 (’99-’03)

PHOTO 212

VIEW 113

UNDER-
HOOD
FUSE/
RELAY
BOX

PHOTO 33

FUSE 20

ECU
20A

See Power
Distribution,
page 10-8.

BLK/

YEL

2

C405

PHOTO 74
VIEW 60

4

See Power
Distribution,
page 10-8.

A

WHT/RED

19

C403

PHOTO 74
VIEW 90

3

See Starting
System

YEL/

BLK

YEL/BLK

BLK/

YEL

WHT

6

1

2

D3

D4

P

R

N

A/T
GEAR
POSITION
SWITCH

PHOTO 66

C470

VIEW 38

8

GRY

2

10

C470

VIEW 38

GRY

G401

PHOTO 79

BLK

BLK

8

A

See Ground
Distribution,
page 14-7.

G302

PHOTO 40

BLK

C322

PHOTO 39

GRN/RED

7

GRN/RED

PARKING
BRAKE
SWITCH
Closed with
parking brake
applied.

PHOTO 81

GRN/RED

)

(Canada

GRN/WHT)

GRN/RED

C321

PHOTO 39

WHT/YEL

PNK

BLK

A

6

GRN/RED

PNK

BLK

GRN/RED

WHT/YEL

Immobilizer
receiver input

Immobilizer
signal output

Park/
brake
input

Park/
neutral
input

Ground

Shield
ground

Battery input

Ignition input

Starter
cut relay
control

Immobilizer
indicator
light control

(IMO CODE)

Immobilizer
signal
input

C

11

POWERTRAIN
CONTROL
MODULE
(PCM)

PHOTO 104
VIEW 115

BLK

WHT

ORN

1

3

HOT IN ON OR START

HOT IN START

HOT AT ALL TIMES

HOT AT ALL TIMES

2004 American Honda Motor Co., Inc.

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+

132-1

Immobilizer System

5

1

B

2

See Brake System
Indicator Light,
page 71, 71-1 or 71-2.

See Ground
Distribution,
page 14-4.

See Power
Distribution,
page 10-15.

See Ground
Distribution,
page 14-12.

G402

PHOTO 106

BLK

’99-’04

IMMOBILIZER
CONTROL
UNIT

PHOTO 84
VIEW 98

YEL/BLK

BLK

1

UNDER-
DASH
FUSE/
RELAY
BOX

PHOTO 75

FUSE 56

BACK UP
RADIO
7.5A

WHT/YEL

7

C307

PHOTO 37
VIEW 47

BRAKE
FLUID LEVEL
SWITCH
Closed with
low fluid level.

PHOTO 39

C430

PHOTO 82
VIEW 51

7

IMMOBILIZER
SYSTEM
INDICATOR
LIGHT

*

See Gauge
Assembly

19

B

See Power
Distribution,
page 10-2.

STARTER
CUT
RELAY

PHOTO 78

FUSE 14

STARTER
SIGNAL
7.5A

3

IMMOBILIZER

RECEIVER

UNIT

PHOTO 86

GAUGE

ASSEMBLY

PHOTO 71 (’99-’03)

PHOTO 212

VIEW 113

UNDER-
HOOD
FUSE/
RELAY
BOX

PHOTO 33

FUSE 6

ECU
20A

5

C501

PHOTO 77
VIEW 30

4

See Power
Distribution,
page 10-2.

A

WHT/

RED

19

C403

PHOTO 74
VIEW 90

3

See Starting
System

WHT

6

1

2

D3

D4

P

R

N

A/T
GEAR
POSITION
SWITCH

PHOTO 66

C470

VIEW 38

8

GRY

2

10

C470

VIEW 38

GRY

G251

PHOTO 46

BLK

BLK

8

A

See Ground
Distribution,
page 14-7.

G301

PHOTO 31

BLK

C322

PHOTO 39

GRN/RED

7

(’99 GRN/RED)

GRN/WHT

PARKING
BRAKE
SWITCH
Closed with
parking brake
applied.

PHOTO 81

GRN/RED

)

(Canada

GRN/WHT)

GRN/RED

C321

PHOTO 39

WHT/YEL

PNK

BLK

A

6

GRN/RED

PNK

BLK

GRN/RED

WHT/YEL

Immobilizer
receiver input

Immobilizer
signal output

Park/
brake
input

Park/
neutral
input

Ground

Shield
ground

Battery
input

Ignition
input

Starter
cut relay
control

Immobilizer
indicator
light control

(IMO CODE)

Immobilizer
signal
input

C

11

POWERTRAIN
CONTROL
MODULE
(PCM)

PHOTO 104
VIEW 115

BLK

WHT

ORN

1

3

PGM-FI
MAIN
RELAY

PHOTO 90
VIEW 99

A

3

A

1

See
PGM-FI

C430

PHOTO 82
VIEW 51

3

YEL/BLK

YEL/BLK

See
PGM-FI

YEL/BLK

YEL/BLK

YEL/BLK

YEL/BLK

HOT IN START

HOT AT ALL TIMES

HOT AT ALL TIMES

*

= ’04 indicators are LEDs

2004 American Honda Motor Co., Inc.

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How the Circuit Works

How the Circuit Works

132-2

Immobilizer System

How the Circuit Works

The immobilizer system is designed to prevent the
car from being started without the owner’s ignition
key. If an attempt is made to start the car without
the correct key, the immobilizer system will disable
the car.

The immobilizer system consists of the immobilizer
control unit, ignition key, immobilizer receiver unit,
immobilizer indicator light, starter cut relay,
powertrain control module (PCM), parking brake
switch, and the A/T gear position switch.

The immobilizer control unit receives battery voltage
through fuse 6 at all times. For ’96-’98 models,
when the ignition switch is in ON (II) or START (III)
and the gear selector is in neutral or park, the
immobilizer control unit receives an “ignition on”
signal through fuse 20 and sends power to the
ignition key transponder through the immobilizer
receiver. For ’99-’04 model vehicles, when the
ignition switch is in ON (II) or START (III), the
PGM-FI main relay coils are energized.The contacts
close, and with the gear selector in neutral or park,
the immobilizer control unit receives an “ignition on”
signal through fuse 6 and sends power to the
ignition key transponder through the immobilizer
receiver unit. The transponder then sends a coded
signal back to the control unit through the receiver.
If the signal is correct, the control unit energizes the
starter cut relay and sends a “fuel enable” signal to
the PCM. The immobilizer indicator light flashes a
code to indicate that the correct key is inserted. If
the ignition key signal is not correct, the immobilizer
control unit disables the starter cut relay and does
not send a “fuel enable” signal to the PCM. The
immobilizer indicator light then flashes a code to
indicate that an incorrect key is inserted.

The ignition key must be programmed to the
immobilizer control unit with the special ignition
switch key (learning key).

Refer to the Service Manual (Section 23, Electrical)
for specific tests and troubleshooting procedures.

2004 American Honda Motor Co., Inc.

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