2000 MITSUBISHI MONTERO ECU

SWS -General Information54B-6
REAR FOG LAMP
If the fog lamp switch is turned ON when the
headlamp or the front fog lamp is turned On, the
rear fog lamp is switched ON and OFF alternatively.If the headlamp and the front fog lamp are turned
OFF during lighting of the rear fog lamp, the rear
fog lamp is turned OFF at the same time.
ROOM LAMP
With the room lamp switch in the DOOR position,
the ETACS-ECU controls the room lamp operation
as follows:
DWhen a door is opened from outside or inside
[with the ignition switch turned to LOCK (OFF)
position]:
When a door is opened, the ETACS-ECU
causes the room lamp to be illuminated at the
100% intensity. When the door is closed, it
dims out the room lamp to 65% intensity and
approx. 30 seconds later, turns out the lamp
completely. During this period (timer controlled
period), the room lamp goes out if the ignition
switch is turned to ON position or the doors
are locked.
DWhen a door is opened or closed with the
ignition switch in the ON position:
The room lamp illuminates at 100% intensity
when a door is opened and turned out when
it is closed.
DWhen no door is opened and the ignition key
is removed:When the ignition key is removed with all the
doors closed, the room lamp is illuminated at
an intensity of 100% and turned out approx.
30 seconds later. During that time
(timer-controlled period), the room lamp goes
out if the ignition key is inserted and turned
to ON position or the door locking system is
activated.
DRoom lamp’s answerback operation in
response to door lock control by keyless entry
system:
To allow the driver to ascertain the result of
the door locking/unlocking control action by
the use of the keyless entry system, the
ETACS-ECU causes the room lamp to blink
twice when the doors are locked through the
system and to illuminate for approx. 15 seconds
when the doors are locked.
The room lamp’s answerback operation in
response to a keyless entry system control
action is accompanied by operation of the
hazard warning lamps.


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SWS -Troubleshooting54B-9
Input signalBuzzer operation condition
Column switchTail lamp switchTurned the lighting switch from OFF to tail lamp
position
Headlamp switchTurn the lighting switch from tail lamp position to
headlamp position
Dimmer switchTurned from OFF to ON
Passing switch
Turn-signal lamp switch
Windshield mist wiper switch
Windshield intermittent wiper switch
Windshield low-speed wiper switch
Windshield high-speed wiper switch
Windshield intermittent wiper interval adjusting
knobRotate the windshield intermittent wiper interval
adjusting knob from FAST to SLOW when the
ignition switch is in ON position (The
ETACS-ECU sends a signal around the medium
knob position)
Windshield washer switchTurned from OFF to ON
Rear wiper switch washer>
Rear washer switch and washer>
Headlamp washer switch headlamp washer>
Power window
main switchAny switch Turned from OFF to ON
TransmitterAny switch system>Turned from OFF to ON
Sunroof switchAny switch Turned from OFF to ON
Center displayAny switch Turned from OFF to ON
DIAGNOSIS CODE CHART
Code No.Diagnosis itemReference page
11Failure concerning the ETACS-ECU54B-10
12Failure concerning the column switch or improper connecting with the ETACS-ECU54B-10
13Failure concerning the front-ECU54B-11
21Short circuit in communication line54B-12


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SWS -Troubleshooting54B-10
DIAGNOSIS CODE INSPECTION PROCEDURES
Code No.11 Failure concerning the ETACS-ECUProbable cause
The ETACS-ECU monitors its own communication data, and sends a diagnosis
code when an error takes place consecutive fifteen times in 0.6 second.
The diagnosis code will be erased when the ETACS-ECU determines that its
own communication data is sent consecutive 15 times in 0.6 second.DMalfunction of ETACS-ECU
Replace the ETACS-ECU.
Code No.12 Failure concerning the column switch or
improper connection with the ETACS-ECUProbable cause
This diagnosis code is displayed when the column switch sends a signal
regardless of the transmission request signal from the ETACS-ECU (three times
or more in one second).
The diagnosis code is erased when the column switch continues to send a
signal according to the transmission request signal from the ETACS-ECU for one
second.DMalfunction of column switch
DMalfunction of ETACS-ECU
DMalfunction of wiring harness or connector
Ye s N G
NG
Check the harness wire between col-
umn switch and fusible link (2).
NG
Repair
No
OK
OK
NG
Repair
NG
OK
Check trouble symptomsNG
NG
Replace
OK
Check trouble symptomsNGCheck the harness wire between column
switch and body earth.
NG
Replace the ETACS-ECU.
Check trouble symptoms.
NG
Replace the column switch.
Check the harness wire between col-
umn switch and ETACS-ECU.
OK
Check trouble symptoms
Check the following connectors:
D-203, D-223, D-27
Check the following connectors:
D-203, D-226
Measure at column switch connector
D-203.
DDisconnect connector and
measure at harness side.
DVoltage between terminal 1 and
body earth.
OK:System voltage
Check the following connector:
D-203
Measure at column switch connector
D-203.
DDisconnect connector and
measure at harness side.
DContinuity between terminal 4
and body earth.
OK:Continuity
Is diagnosis code No. 12 output
when the ignition switch is at the
ON position?


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SWS -Troubleshooting54B-11
Code No.13 Failure concerning the front-ECUProbable cause
This diagnosis code is displayed when the signals that the front-ECU sends to
the ETACS-ECU are errors consecutive fifteen times in 0.6 second.
The diagnosis code will be erased when the front-ECU sends normal signals to
the ETACS-ECU consecutive 15 times in 0.6 second.DMalfunction of front-ECU
DMalfunction of ETACS-ECU
DMalfunction of wiring harness or connector
OK
Is diagnosis code No. 12 output
when the ignition switch is at the
ON position?Ye sMeasure at front-ECU connector A-07X.
DDisconnect connector and
measure at harness side.
DVoltage between terminal 7 and
body earth
OK:System voltageNGCheck the following connector:
A-07X
NG
Check the harness wire between front-
ECU and fusible link (2).
No
Measure at front-ECU connector A-08X.
DDisconnect connector and
measure at harness side.
DContinuity between terminal 31
and body earth.
OK:ContinuityCheck the following connectors:
A-08X, D-27, D-31, D-226NG
Repair
OK
Replace the front-ECU.
OK
Check trouble symptoms.NGReplace the front-ECU.
NG
Check the following connector:
A-08XNG
Repair
NG
RepairOK
Check trouble symptoms.
OK
Check the trouble symptoms.NGCheck the harness wire between front-
ECU and body earth.
Check trouble symptoms.
NG
Replace the ETACS-ECU.


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SWS -Troubleshooting54B-12
Code No.21 Short circuit in communication linesProbable cause
This diagnosis code is displayed when the SWS communication line voltage
reaches the LO level for 0.3 second. The diagnosis code is erased when
voltage in the ETACS-ECU data line reaches the HI level for 0.3 second, or the
ETACS-ECU receives a normal signal from other ECUs or switches. While this
code is displayed, other codes are not displayed.DMalfunction of column switch
DMalfunction of front-ECU
DMalfunction of power windowmainswitch

DMalfunction of sunroof motor assembly with sunroof>
DMalfunction of center display display>
DMalfunction of ETACS-ECU
DMalfunction of wiring harness or connector
NG
Repair
OK
Ye s
Replace the column switch.
No
Ye s
Replace the front-ECU.
No
Ye s
Replace the power windowmainswitch.
No
Ye s
Replace the center display.
No
Replace the ETACS-ECU.
No
Ye s
Replace the sunroof motor assembly.
Is diagnosis code No. 21 no longer output when center
display connector D-06 is disconnected?
Is diagnosis code No. 21 no longer output when sunroof
motor assembly connector F-06 is disconnected?
Is diagnosis code No. 21 no longer output when power
window mainswitch connector H-05 is disconnected?
Is diagnosis code No. 21 no longer output when front-ECU
connector A-08X is disconnected? (However, code No. 13 is
still output.)
Is diagnosis code No. 21 no longer output when column
switch connector D-203 is disconnected? (However, code No.
12 is still output.)
NG
Check the harness wires between column switch and ETACS-ECU,
front-ECU and ETACS-ECU, power windowmainswitch and
ETACS-ECU, sunroof motor assembly and ETACS-ECU, center
display and ETACS-ECU.NG
Repair
OK
Check trouble symptoms.
Check the following connectors:
A-08X, D-06, D-25, D-27, D-29, D-31, D-203, D-226, F-02, F-06,
H-05


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SWS -Troubleshooting54B-15
Trouble symptomInspection
procedureReference
page
Rear fog lampRear fog lamp do not illuminate when the rear fog lamp switch
is turned on.N-154B-40
Rear fog lamp do not go out when the headlamps and front fog
lamps are turned off while the rear fog lamp is on.N-254B-40
Room lampRoom lamp does not illuminate.O-154B-41
Room lamp dimming function does not work normally.O-254B-41
Center displayCenter display does not work normally.–GROUP 54A
– Center Dis-
play.
DEFECTS FOUND BY INPUT SIGNAL CHECK
If the input signal check finds a defect, follow the table below to check.
Trouble symptomInspection
procedureReference
page
Ignition switch (ACC) signal is not sent to the ETACS-ECU.P-154B-42
Ignition switch (IG1) signal is not sent to the ETACS-ECU.P-254B-42
Key reminder switch signal is not sent to the ETACS-ECU.P-354B-43
Hazard warning lamp switch signal is not sent to the ETACS-ECU.P-454B-43
Front fog lamp switch signal is not sent to the ETACS-ECU.P-554B-44
Rear fog lamp switch signal is not sent to the ETACS-ECU.P-654B-45
Back-up lamp switch signal is not sent to the ETACS-ECU.P-754B-45
Inhibitor switch (reverse) signal is not sent to the ETACS-ECU.P-854B-46
Rear wiper motor auto-stop signal is not sent to the ETACS-ECU.P-954B-46
Driver’s door switch signal is not sent to the ETACS-ECU.P-1054B-47
Door switches signal is not sent to the ETACS-ECU.
Front passenger’s or back door lock key cylinder switch signal is not sent to the
ETACS-ECU.P-1154B-48
Driver’s door lock actuator switch signal is not sent to the ETACS-ECU.P-1254B-48


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SWS -Troubleshooting54B-16
Trouble symptomInspection
procedureReference
page
Column switchTail lamp switch signal is not sent to the ETACS-ECU.P-1354B-49
Headlamp switch signal is not sent to the ETACS-ECU.
Dimmer switch signal is not sent to the ETACS-ECU.
Passing switch signal is not sent to the ETACS-ECU.
Turn-signal lamp switch signal is not sent to the ETACS-ECU.
Windshield mist wiper switch signal is not sent to the
ETACS-ECU.P-1454B-50
Windshield intermittent wiper switch signal is not sent to the
ETACS-ECU.
Windshield low-speed wiper switch signal is not sent to the
ETACS-ECU.
Windshield high-speed wiper switch signal is not sent to the
ETACS-ECU.
Windshield intermittent wiper interval adjusting knob signal is
not sent to the ETACS-ECU.P-1554B-50
Windshield washer switch signal is not sent to the
ETACS-ECU.P-1454B-50
Rear wiper switch signal is not sent to the ETACS-ECU.
Rear washer switch signal is not sent to the ETACS-ECU.
Headlamp washer switch signal is not sent to the ETACS-ECU.P-1354B-49
Power window
main switchAny switch signal is not sent to the ETACS-ECU.P-1654B-51
TransmitterAny switch signal is not sent to the ETACS-ECU.P-1754B-52
Sunroof switchAny switch signal is not sent to the ETACS-ECU.P-1854B-52
Center displayAny switch signal is not sent to the ETACS-ECU.P-1954B-53


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SWS -TroubleshootingSWS -Troubleshooting54B-17
INSPECTION PROCEDURE FOR TROUBLE SYMPTOMS
Inspection Procedure A-1
Communication with the MUT-II
is impossible.Probable cause
The harness wires between the ETACS-ECU power supply line or the
ETACS-ECU and the diagnosis connector may be defective.DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
Ye s
Ye s
Check the ETACS-ECU battery circuit. (Refer to P.54B-53, Inspec-
tion Procedure Q-1.)
No
NG
NG
Repair
NG
Check the harness wire between ETACS-ECU and body earth.
OK
OK
Replace the ETACS-ECU.
NG
Repair
NG
Check the harness wire between ETACS-ECU and diagnosis con-
nector.NG
Repair
OK
Check trouble symptoms.
Check following connectors:
D-226, D-222, D-23
OK
Check trouble symptoms.
Check following connectors:
D-224, D-209Measure at ETACS-ECU connector D-224.
DDisconnect connector and measure at J/B side.
DContinuity between terminal 20 and body earth.
OK:Continuity
Is communication with the MUT-
IIpossible when the ignition
switch is at the ON position?
Can MUT-
IIcommunicate with other system?NoCheck and repair the self-diagnosis system with the MUT-
II.
Inspection Procedure B-1
Buzzer: Light reminder warning buzzer function does not
work normally.Probable cause
The ETACS-ECU operates the light reminder warning buzzer function, based on
input signals from the following switches:
DIgnition switch (IG1)
DDriver’s door switch
DTail lampswitch
DHeadlamp switch
If the function does not work normally, a defect on the relevant circuit or the
ETACS-ECU may be suspected.DMalfunction of driver’s door switch
DMalfunction of column switch
DMalfunction of ETACS-ECU
DMalfunction of harness wire or connector
NoCheck the ETACS-ECU battery circuit. (Refer to P.54B-53, Inspec-
tion Procedure Q-1.)
Ye s
NG
Check the defective input circuit. (Refer to P.54B-15, Defects Found
by Input Signal Check.)
OK
Replace the ETACS-ECU.
Do all of the following functions operate when the ignition key
is at the LOCK (OFF) position?
DHazard warninglamp
DRoom lamp
MUT-
IIinput signal check
DIgnition switch (IG1)
DDriver’s door switch
DTail lampswitch
DHeadlamp switch


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