2005 MITSUBISHI 380 turn signal

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-340
INSPECTION PROCEDURE J-1: Fog Light: Fog lamps do not illuminate when the fog lamp switch is
turned on.
NOTE: This troubleshooting procedure requires the
use of Diagnostic Tool MB991958 and SWS monitor
kit MB991813. For details on how to use the SWS
monitor, refer to "How to connect SWS monitor
P.54B-13."
.
CIRCUIT OPERATION
The ETACS-ECU sends a fog lamp illumination
request signal ("LAMP ON" signal) to the
front-ECU when the fog lamp switch is turned on
while the headlamps are illuminating at low
beam.
Then the front-ECU switches on its relay to illumi-
nate the fog lamps.
.
TECHNICAL DESCRIPTION (COMMENT)
If the headlamps illuminate at low beam, the fog
lamp relay, the fog lamp switch, the front-ECU or the
ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
Trouble in input signal system
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
The fog lamp relay may be defective
The front-ECU may be defective
The ETACS-ECU may be defective
DIAGNOSIS
Required Special Tools:
MB991223: Harness Set
MB991958: Diagnostic Tool (MUT-III Sub Assembly)
MB991824: Vehicle Communication Interface (V.C.I.)
MB991827: MUT-III USB Cable
MB991910: MUT-III Main Harness A
MB991813: SWS Monitor Kit
MB991806: SWS Monitor Cartridge
MB991812: SWS Monitor Harness (For Column-ECU)
MB991822: Test Probe Harness
STEP 1. Check the headlamp (low-beam) operation.
Q: Do the headlamps illuminate at low beam normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure H-2 "The headlamps
(low-beam) do not illuminate normally P.54B-264."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-341
STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Set each switch to the following condition before checking input
signal from the fog lamp switch:
Ignition switch: ON
Fog lamp switch: ON
NOTE: Turn the ignition switch to the "ON" position in order to
disable the headlamp automatic shutdown function.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958. Connect special tool MB991910 before con-
necting special tool MB991812. Be sure to connect special
tool MB991806 after turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS
monitor P.54B-13."
(2) Operate Diagnostic Tool MB991958 according to the
procedure below to display "F.FOG."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "LIGHTING."
g. Select "F.FOG."
(3) Check that normal conditions are displayed for the items
described in the table below.
Q: Does the Diagnostic Tool MB991958 display the items
"IG SW (IG1)" and "F.FOG LAMP" as normal condition?
Normal conditions are displayed for all the items : Go to
St e p 3 .
Normal condition is not displayed for "IG SW (IG1)" :
Refer to Inspection Procedure M-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1) P.54B-408."
Normal condition is not displayed for "F.FOG LAMP" :
Refer to Inspection Procedure M-3 "ETACS-ECU
does not receive any signal from the fog lamp switch
P.54B-410." ITEM NO. ITEM NAME NORMAL CONDITION
ITEM 30 IG SW (IG1) ON
ITEM 36 F.FOG LAMP ON

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-356
Interior lamp automatic-shutoff function
Illuminated interior lamps such as the front dome
lamp, etc. (all lamps using the dome lamp fuse as the
power supply) will automatically go off in the follow-
ing conditions to prevent the battery from discharging
as a result of forgetting to turn off the lamps or
incomplete closing of the door.
When the ignition switch is turned off and more
than 30 minutes pass with the interior lamp illumi-
nated, the interior lamps will go off automatically.
When the ignition switch is turned off and one of
the door switches remains open for 30 minutes
continuously, the interior lamps will go off auto-
matically.
NOTE: The interior lamp automatic shutoff function
can be customised on vehicles equipped with a multi
center display (middle grade type). Refer to
P.54B-486.
Ignition key hole illumination lamp function
The ignition key hole illumination lamp illuminates when the
driver's door is opened with the ignition switch off, and for 30
seconds after the driver's door is closed. It also illuminates for
30 seconds after the ignition key is pulled out. In any case, it
goes out when the ignition switch is turned on.
Door ajar indicator
The combination meter receives the signal sent from the
ETACS-ECU about whether each door is open or closed and
turns the door ajar indicator on and off. While the door ajar indi-
cator is illuminated, the door ajar warning function is activated
and the door ajar indicator flashes 4 times. If the door remains
open even after the 4 warning flashes, the door ajar indicator
will be illuminated again. And when the interior lamp auto-
matic-shutoff function is activated, the door ajar indicator is
extinguished.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-358
If any of the following conditions is met with the igni-
tion switch at "ON" or "ST", the ETACS-ECU illumi-
nates, flashes or extinguishes the seat belt indicator
by using the driver's seat belt switch signal and the
vehicle speed signal sent from the combination
meter.
Illuminates when the ignition switch is at "ON"
and the seat belt switch is turned on (the driver's
seat belt is unfastened).
Flashes and illuminates the indicator 12 cycles
(after 0.5 seconds) if any of the following condi-
tions is met when sixty seconds or more have
elapsed since the ignition switch is turned "ON".
One cycle consists of five-second "flashing" and
then three-second "illumination".a. The vehicle speed has reached 8 km/h (5
mph) while the seat belt switch is turned on
(driver's seat belt is not fastened) with the
ignition switch "ON.
b. The seat belt switch has been turned on
(driver's seat belt has not been fastened) for
at least ten seconds while the ignition switch
has been turned "ON" and the vehicle speed
has been 8 km/h (5 mph) or more.
NOTE: Once this timer operation has been acti-
vated, it will not be activated again until the
vehicle speed reduces to 3 km/h (2 mph) or
less even if any of the following conditions is
met.
The indicator stops illuminating if the ignition
switch or the seat belt switch is turned off (the
driver's seat belt is fastened) while the timer
operation is active.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-363
STEP 3. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:
Key reminder switch
Interior lamp loaded signal
Door switches
(1) Operate diagnostic tool MB991958 according to the
procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."
(2) Check if diagnostic tool MB991958 sounds or not.
Q: When the key reminder switch, any door switch or
interior lamp is operated, does diagnostic tool
MB991958 sound?
Buzzer of diagnostic tool MB991958 sounds normally. :
Go to Step 4.
Diagnostic tool MB991958 does not sound when the
ignition key is removed and reinserted : Refer to
Inspection Procedure N-1 "ETACS-ECU does not
receive any signal from the key reminder switch
P.54B-432."
When one of the interior lamps is illuminated,
diagnostic tool MB991958 does not sound : Refer to
Inspection Procedure N-9 "ETACS-ECU does not
receive any interior lamp loaded signal P.54B-474."
When one of the doors is opened and closed,
diagnostic tool MB991958 does not sound : Refer to
Inspection Procedure N-3 "ETACS-ECU does not
receive any signal from any of the door switches
P.54B-440." ITEM NAME CONDITION
key reminder switch Remove and reinsert the ignition
key
interior lamp loaded
signalTurn on one of the interior lamps
door switches Open or close one of the doors

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-385
STEP 3. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:
Key reminder switch
Interior lamp loaded signal
(1) Operate diagnostic tool MB991958 according to the
procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."
(2) When the switches (see table below), which are applicable
for the input signal check, are operated, check if diagnostic
tool MB991958 sounds or not.
Q: When the key reminder switch and the interior lamp are
operated, does diagnostic tool MB991958 sound in each
case?
Buzzer of diagnostic tool MB991958 sounds normally. :
Go to Step 4.
When the ignition key is removed and reinserted,
diagnostic tool MB991958 does not sound : Refer to
Inspection Procedure N-1 "ETACS-ECU does not
receive any signal from the key reminder switch
P.54B-432."
When one of the interior lamps is illuminated,
diagnostic tool MB991958 does not sound : Refer to
Inspection Procedure N-9 "ETACS-ECU does not
receive any interior lamp loaded signal P.54B-474."
STEP 4. Check ETACS-ECU connector C-218 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-218 in good condition?
YES : Go to Step 5.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the ignition key hole illumination
lamp illuminates normally. ITEM NAME CONDITION
key reminder switch Remove and reinsert the
ignition key
interior lamp loaded signal Turn on one of the interior
lamps

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-393
STEP 5. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:
Door switches
Interior lamp loaded signal
(1) Operate diagnostic tool MB991958 according to the
procedure below to display "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."
(2) Check if diagnostic tool MB991958 sounds or not.
Q: When any door switch, interior lamp or the trunk lid
latch is operated, does diagnostic tool MB991958
sound?
Buzzer of diagnostic tool MB991958 sounds normally. :
Replace the ETACS-ECU. Verify that the dome lamp
illuminates normally.
When one of the doors is opened and closed,
diagnostic tool MB991958 does not sound : Refer to
Inspection Procedure N-3 "ETACS-ECU does not
receive any signal from any of the door switches
P.54B-440."
When one of the interior lamps is illuminated,
diagnostic tool MB991958 does not sound : Refer to
Inspection Procedure N-9 "ETACS-ECU does not
receive any interior lamp loaded signal P.54B-474." ITEM NAME CONDITION
interior lamp loaded
signalTurn on one of the interior lamps
door switch Open or close one of the doors

INPUT SIGNAL PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-406
DIAGNOSIS
Required Special Tool:
MB991223: Harness Set
STEP 1. Check ETACS-ECU connector C-219 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is ETACS-ECU connector C-219 in good condition?
YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. If the equipment described in "CIRCUIT
OPERATION" works normally, the input signal from
the ignition switch (ACC) should be normal.
STEP 2. Check the ignition switch (ACC) line of the power
supply circuit to the ETACS-ECU. Measure the voltage at
ETACS-ECU connector C-219.
(1) Disconnect ETACS-ECU connector C-219 and measure the
voltage available at the junction block side of the connector.
(2) Turn the ignition switch to the "ACC" position.
(3) Measure the voltage between terminal 4 and ground.
The voltage should measure approximately 12 volts
(battery positive voltage).
Q: Is the measured voltage approximately 12 volts (battery
positive voltage)?
YES : Replace the ETACS-ECU. If the equipment described
in "CIRCUIT OPERATION" works normally, the input
signal from the ignition switch (ACC) should be
normal.
NO : Go to Step 3.