Acura RL (1996-2004 year). Manual — part 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
BLK
‘96-‘98
IMMOBILIZER
CONTROL
UNIT
ECU
20A
See Power
Distribution,
page 10-2.
YEL/
BLK
3
C430
BLK
5
C501
1
UNDER-
DASH
FUSE/
RELAY
BOX
BACK UP
RADIO
7.5A
WHT/YEL
7
C307
5
BRAKE
FLUID LEVEL
SWITCH
Closed with
low fluid level.
C476
21
IMMOBILIZER
SYSTEM
INDICATOR
LIGHT
See Gauge
Assembly
19
B
See Power
Distribution,
page 10-2.
STARTER
CUT
RELAY
STARTER
SIGNAL
7.5A
3
IMMOBILIZER
RECEIVER
UNIT
GAUGE ASSEMBLY
UNDER-
HOOD
FUSE/
RELAY
BOX
ECU
20A
See Power
Distribution,
page 10-8.
BLK/
YEL
2
C405
4
See Power
Distribution,
page 10-8.
A
WHT/RED
19
C403
3
YEL/
BLK
YEL/BLK
BLK/
YEL
WHT
6
1
2
D3
D4
P
R
N
A/T
GEAR
POSITION
SWITCH
C470
8
GRY
2
10
C470
GRY
G401
BLK
BLK
8
A
See Ground
Distribution,
page 14-7.
G302
BLK
C322
GRN/RED
7
GRN/RED
PARKING
BRAKE
SWITCH
Closed with
parking brake
applied.
GRN/RED
)
(Canada
GRN/WHT)
GRN/RED
C321
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
POWERTRAIN
CONTROL
MODULE
(PCM)
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
BLK
’99-’04
IMMOBILIZER
CONTROL
UNIT
YEL/BLK
BLK
1
UNDER-
DASH
FUSE/
RELAY
BOX
BACK UP
RADIO
7.5A
WHT/YEL
7
C307
BRAKE
FLUID LEVEL
SWITCH
Closed with
low fluid level.
C430
7
IMMOBILIZER
SYSTEM
INDICATOR
LIGHT
*
See Gauge
Assembly
19
B
See Power
Distribution,
page 10-2.
STARTER
CUT
RELAY
STARTER
SIGNAL
7.5A
3
IMMOBILIZER
RECEIVER
UNIT
GAUGE
ASSEMBLY
UNDER-
HOOD
FUSE/
RELAY
BOX
ECU
20A
5
C501
4
See Power
Distribution,
page 10-2.
A
WHT/
RED
19
C403
3
WHT
6
1
2
D3
D4
P
R
N
A/T
GEAR
POSITION
SWITCH
C470
8
GRY
2
10
C470
GRY
G251
BLK
BLK
8
A
See Ground
Distribution,
page 14-7.
G301
BLK
C322
GRN/RED
7
(’99 GRN/RED)
GRN/WHT
PARKING
BRAKE
SWITCH
Closed with
parking brake
applied.
GRN/RED
)
(Canada
GRN/WHT)
GRN/RED
C321
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
POWERTRAIN
CONTROL
MODULE
(PCM)
BLK
WHT
ORN
1
3
PGM-FI
MAIN
RELAY
A
3
A
1
See
PGM-FI
C430
3
YEL/BLK
YEL/BLK
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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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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