Acura RL (1996-2004 year). Manual — part 647

Multiplex Control System

Self-diagnosis Function (Mode 2)

From mode 1, disconnect the SCS service connector from the multiplex control inspection connector for 5 to 10
seconds, then reconnect the SCS service connector again, and the function goes from mode 1 to mode 2.

To cancel mode 2, disconnect the SCS service connector from the multiplex control inspection connector for more than 10
seconds or turn the ignition switch OFF.

1. Operate the switches as shown below in mode 2.

2. If the related circuit line of the switch is OK, the function indicates this by the ignition key light blinking once and the

beeper sounding once.
NOTE: If the line is faulty, there should be no indication. Refer to the tests for each system.

Object Input Table:

Mode 2:

Hood switch (OPEN)

Trunk latch switch (OPEN)

Radio security input

Trunk opener main switch

Front passenger's door switch

(OPEN)

Front passenger's key cylinder switch

(LOCK/UNLOCK)

Front passenger's door lock switch

(LOCK/UNLOCK)

Front passenger's door lock knob

switch (UNLOCK)

Right rear door switch (OPEN)
Right rear door lock knob switch

(UNLOCK)

Keyless transmitter

(LOCK button)
(UNLOCK button)
(TRUNK button)
(PANIC button)

Rear window defogger switch
Engine oil pressure switch

Multiplex Control Unit (Passenger's)

Multiplex Control Unit (Driver's)

Combination light switch (ON)
Front fog light switch (ON)
Dash lights brightness controller
Left rear door switch (OPEN)

Left rear door lock knob switch

(UNLOCK)

Trunk key cylinder switch (OPEN)

Driver's seat belt switch

(UNBUCKLED)

Windshield wiper/washer switch

(Except MIST switch)

Brake switch (ON)

Vehicle speed sensor (VSS)

Parking brake switch (ON)

Transmission range switch

Multiplex Control Unit (Door)

Driver's door switch (OPEN)
Driver's door key cylinder switch

(LOCK/UNLOCK)

Driver's door lock switch

(LOCK/UNLOCK)

Driver's door lock knob switch

(LOCK/UNLOCK)

Trunk opener switch (PUSH)

Power window master switch

(Except driver's switch)

Main Menu

Table of Contents

Integrated Control

Ignition Key Light Replacement

1. Remove the dashboard lower cover (see

section 20

).

2. Remove the column covers (see

section 17

).

3. Turn the bulb socket 45° counterclockwise to remove

it from the key light housing.

BULB (1.4 W)

KEY LIGHT
HOUSING

BULB
SOCKET

Main Menu

Table of Contents

Dash Lights Brightness Control

Controller Test/Replacement

1. Remove the driver's switch panel (see

section 20

).

2. Measure resistance between the No. 3 and No. 4 ter-

minals while rotating the adjusting dial. Resistance

should vary from 0 to 10,000 ohms as the dial is
rotated.

DRIVER'S SWITCH
PANEL

BULB

(0.84 W)

DASH LIGHTS
BRIGHTNESS
CONTROLLER

3. Turn the CANCEL switch off by rotating the adjusting

beyond its end position (until if clicks). There should
be no continuity between the No. 2 and No. 6 termi-
nals.

NOTE: The cancel switch is closed with the adjusting
dial between the minimum and maximum positions.

4. If necessary, remove the two screws, and replace the

controller.

SCREWS

Main Menu

Table of Contents

LEFT REAR DOOR SWITCH*
Test, page

23-264

LEFT REAR DOOR
COURTESY LIGHT
Replacement,
page

23-263

DRIVER'S DOOR
COURTESY LIGHT
Replacement,
page

23-263

DRIVER'S DOOR SWITCH*
Test, page

23-264

FRONT CEILING LIGHT
Test, page

23-262

FRONT PASSENGER'S DOOR
COURTESY LIGHT
Replacement, page

23-263

REAR CEILING LIGHT
Test, page

23-262

FRONT PASSENGER'S*
DOOR SWITCH
Test, page

23-264

RIGHT REAR DOOR SWITCH*
Test, page

23-264

RIGHT REAR DOOR

COURTESY LIGHT

Replacement,
page

23-263

Entry Light Control System

Component Location Index

• IGNITION KEY SWITCH

Test, page

23-263

*: You can also test the switch by using the self-diagnosis function (mode 2). (See page

23-252

.)

Main Menu

Table of Contents