Mitsubishi Evolution X. Manual — part 596
42C-1
GROUP 42C
WIRELESS
CONTROL MODULE
(WCM)
CONTENTS
GENERAL INFORMATION. . . . . . . .
SERVICE SPECIFICATIONS. . . . . . .
SPECIAL TOOL . . . . . . . . . . . . . . . . .
DIAGNOSIS . . . . . . . . . . . . . . . . . . . .
STANDARD FLOW OF DIAGNOSTIC
TROUBLESHOOTING . . . . . . . . . . . . . . . .
DIAGNOSTIC FUNCTION . . . . . . . . . . . . .
ID CODES REGISTRATION JUDGMENT
TABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
WARNINGS/ALARMS. . . . . . . . . . . . . . . . .
DIAGNOSTIC TROUBLE CODE CHART . .
DIAGNOSTIC TROUBLE CODE
PROCEDURES. . . . . . . . . . . . . . . . . . . . . .
DATA LIST REFERENCE TABLE . . . . . . .
TROUBLE SYMPTOM CHART. . . . . . . . . .
SYMPTOM PROCEDURES . . . . . . . . . . . .
INPUT SIGNAL REFERENCE TABLE . . . .
INPUT SIGNAL PROCEDURES. . . . . . . . .
CHECK AT ECU TERMINALS . . . . . . . . . .
ON-VEHICLE SERVICE . . . . . . . . . . .
ID CODES REGISTRATION PROCEDURE
TPMS TRANSMITTER CHECK. . . . . . . . . .
TPMS TRANSMITTER ID CHECK . . . . . . .
KEYLESS ENTRY SYSTEM CHECK . . . . .
INSPECTION OF KEYLESS ENTRY TIMER
LOCK FUNCTION . . . . . . . . . . . . . . . . . . . .
CUSTOMIZATION FUNCTION . . . . . . . . . .
WCM . . . . . . . . . . . . . . . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
TRANSMITTER. . . . . . . . . . . . . . . . . .
DISASSEMBLY AND ASSEMBLY . . . . . . .
INSPECTION. . . . . . . . . . . . . . . . . . . . . . . .
TPMS TRANSMITTER . . . . . . . . . . . .
REMOVAL AND INSTALLATION . . . . . . . .
RECEIVER ANTENNA ASSEMBLY. .
REMOVAL AND INSTALLATION . . . . . . . .
GENERAL INFORMATION
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WIRELESS CONTROL MODULE (WCM)
42C-2
GENERAL INFORMATION
M1427500100061
The wireless control module (WCM) is a system that
integrates the keyless entry function, with which
remote operation (opening/closing of all doors, open-
ing of trunk lid, and operation of warning function that
warns a person who intends to damage the vehicle
*
), can be performed by operating the lock/unlock
button, trunk lid button or panic button on the ignition
key (transmitter). Also, WCM incorporates the immo-
bilizer function, which prohibits the starting of engine
using an unauthorized key, and the tire pressure
monitoring system (TPMS), which issues a warning
to a driver by illuminating or flashing the warning light
if an abnormality to the tire pressure or the system
error is detected. WCM has the following features:
• The ignition key has an indicator light that
enables the driver to check if the signal is trans-
mitted correctly or if the battery in the key is dis-
charged.
• Each vehicle is provided with two ignition keys,
and up to eight ignition keys can be registered.
• Settings of the keyless entry function can be
adjusted using a customization function.
NOTE:
*
: Horn sounds, and headlights and taillights
flash.
.
CONSTRUCTION DIAGRAM
AC709254
LOW
TIRE PRESSURE
Multi information display
(Built in combination meter)
TPMS
warning light
AB
ETACS-ECU
WCM
Lock button
Unlock button
Ignition key
ECM
Indicator light
TPMS transmitter
(Tire pressure sensor)
TPMS transmitter
(Tire pressure sensor)
ASC-ECU
Trunk lid button
Panic button
Reciever antenna assembly
GENERAL INFORMATION
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WIRELESS CONTROL MODULE (WCM)
42C-3
.
Main components and functions
NOTE:
.
•
*
: Illuminates for tire pressure warning.
•
*
: Flashes for about 1 minute and then continuously illuminated for TPMS malfunction warning.
.
Parts name
Functional description
WCM
Controls the keyless entry functions, TPMS functions and starting of the engine
by using the following communications.
• Communications with ETACS-ECU, ECM, ASC-ECU and combination
meter via CAN
• Wireless communication with the ignition key (transponder)
• Wireless communication with the ignition key (transmitter) via the receiver
antenna assembly
Reciever antenna
assembly
Receives the operation signals from the lock/unlock buttons, trunk lid button,
and panic button on the ignition key (transmitter) as well as the tire pressure
signal from the TPMS transmitter. Then, transmits them to WCM.
Ignition key
The ignition key also sends signals to reciever antenna assembly when the
lock/unlock/trunk lid button and the panic button on it are operated.
Combination meter (Multi
information display, TPMS
warning light)
Communicates with WCM via CAN. Send ignition switch status. Receives the
warning request or warning information about TPMS from WCM, activates
*
the
TPMS warning iight. Warning symbol and message is additionally displayed on
the multi information display.
ETACS-ECU
Communicates with WCM via CAN. By the door lock/unlock request, trunk lid
open request, or panic alarm request from WCM, ETACS-ECU outputs the
lock/unlock signal, trunk lid open signal, or panic alarm signal. When the door
lock/unlock signal is output, ETACS-ECU flashes or illuminates the turn signal
light and dome light to notify that the lock/unlock operation is performed.
ASC-ECU
Communicates with WCM via CAN. Sends the vehicle speed data.
ECM
Communication with WCM via CAN. Send atmospheric pressure data..
TPMS transmitter
Measure tire pressure directly, then send radio frequency signal to receiver
antenna assembly.
SERVICE SPECIFICATIONS
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WIRELESS CONTROL MODULE (WCM)
42C-4
System configuration
NOTE: In case of replacement of WCM, all keyless
ID, key ID and tire pressure sensor ID should be
re-registered using scan tool MB991958 (M.U.T.-III
sub-assembly).
SERVICE SPECIFICATIONS
M1427501500028
AC709230
Door lock actuator
ETACS-ECU
Turn-signal light
Wireless control module
(WCM)
ECM
Combination meter
(Multi information display,
TPMS warning light)
Lock button
Unlock button
Indicator light
CAN-B
communi-
cation
CAN-C comm-
unication
AB
Trunk lid latch
Ignition key
Radio
frequency
signal
(transponder)
Front tire (LH)
Front tire (RH)
Rear tire (LH)
Rear tire (RH)
TPMS transmitter
CPU
Transmission
circuit
Antenna
Pressure
sensor
Acc.
sensor
Battery
ASC-ECU
Dome light,
Ignition key cylinder
illumination light
Horn
Panic button
Trunk lid button
Radio
frequency
signal
(transmitter)
Reciever antenna
assembly
Radio
frequency
signal (transmittter)
Head light,
Tail light
Item
Standard value
Voltage of transmitter battery (V)
2.5 ~ 3.2
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