2005 MITSUBISHI 380 Workshop Manual

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-313
STEP 7. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
Ignition switch: ON
Turn-signal lamp switch: RH
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) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate Diagnostic Tool MB991958 according to the
procedure below to display "TURN SIG.RH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "TURN SIGNAL."
g. Select "TURN SIG.RH."
(4) Check that normal conditions are displayed for the items
described in the table below.
Q: Does the Diagnostic Tool MB991958 display the items
"T/S RH SW" and "IG SW (IG1)" as normal condition?
Normal conditions are displayed for all the items : Go to
St e p 8 .
Normal condition is not displayed for "T/S RH SW" :
Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the turn-signal lamp
switch P.54B-420."
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." ITEM NO. ITEM NAME NORMAL CONDITION
ITEM 10 T/S RH SW ON
ITEM 30 IG SW (IG1) ON

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-314
STEP 8. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
If the Ignition switch is turned to the "ON" position and the
turn-signal lamp switch (LH) is turned on, normal conditions
should be displayed for the items described in the table below.
(1) Operate Diagnostic Tool MB991958 according to the
procedure below to display "TURN SIG.LH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "TURN SIGNAL."
g. Select "TURN SIG.LH."
(2) Check that normal conditions are displayed for the item
described in the table below.
Q: Do the Diagnostic Tool display the item "T/S LH SW" as
normal condition?
YES : Replace the ETACS-ECU. Verify that the turn-signal
lamps illuminate normally.
NO : Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the turn-signal lamp
switch P.54B-420."
INSPECTION PROCEDURE I-2: Flasher Timer: Hazard warning lamps do not flash when the hazard
warning lamp switch is turned on.
.
CIRCUIT OPERATION
If the ETACS-ECU receives "ON" signal from the
hazard warning lamp switch, the ETACS-ECU turns
on the flasher timer (incorporated in the
ETACS-ECU), thus causing the turn-signal lamps to
flash.
.
TECHNICAL DESCRIPTION (COMMENT)
If the hazard warning lamps do not flash, the power
supply line to the ETACS-ECU (dedicated to the
turn-signal lamps) or the ETACS-ECU may be defec-
tive.
.
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 ETACS-ECU may be defective ITEM No. ITEM NAME NORMAL CONDITION
ITEM 11 T/S LH SW ON

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-315
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
STEP 1. Check the turn-signal lamps.
Q: Do the turn-signal lamps illuminate normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure I-1 "Turn-signal lamps
do not flash when the turn-signal lamp switch is
turned on P.54B-310."
STEP 2. Check the input signal (by using the pulse check
mode of the monitor).
Check input signal from the hazard warning lamp switch.
To prevent damage to Diagnostic Tool MB991958, always
turn the ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting Diagnostic Tool
MB991958.
(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 "Pulse check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "Pulse Checking."
(3) Check that Diagnostic Tool MB991958 sounds when the
hazard warning lamp switch is turned from "OFF" to "ON."
Q: Does Diagnostic Tool MB991958 sound when the hazard
warning lamp switch is turned from "OFF" to "ON"?
YES : Replace the ETACS-ECU. Verify that the hazard
warning lamps illuminate normally.
NO : Refer to Inspection Procedure N-2 "ETACS-ECU
does not receive any signal from the hazard warning
lamp switch P.54B-436."

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-316
INSPECTION PROCEDURE I-3: Flasher Timer: One of the turn-signal lamps does not illuminate.
.
TECHNICAL DESCRIPTION (COMMENT)
If the right or left turn-signal lamp does not illuminate,
their bulb may be defective.
.
TROUBLESHOOTING HINTS
Refer to circuit diagrams GROUP-90
Refer to configuration diagrams GROUP-80
The turn-signal lamp bulb may be defective
The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-317
DIAGNOSIS
Required Special Tool:
MB991223: Harness Set
STEP 1. Check the hazard warning lamp.
Q: Which turn-signal lamp does not illuminate?
front turn-signal lamp (LH) : Go to Step 2.
side turn-signal lamp (LH) : Go to Step 8.
front turn-signal lamp (RH) : Go to Step 14.
side turn-signal lamp (RH) : Go to Step 20.
rear combination lamp (LH) : Go to Step 26.
rear combination lamp (RH) : Go to Step 32.
Turn-signal indicators : Refer to Inspection Procedure I-4
"The turn-signal lamp indicator does not illuminate
normally P.54B-335."
LH side only : Refer to Inspection Procedure I-1
"Turn-signal lamps do not flash when the turn-signal
lamp switch is turned on P.54B-310."
RH side only : Refer to Inspection Procedure I-1
"Turn-signal lamps do not flash when the turn-signal
lamp switch is turned on P.54B-310."
Both LH and RH sides : Refer to Inspection Procedure I-2
"Hazard warning lamps do not flash when the hazard
warning lamp switch is turned on P.54B-314."
STEP 2. Check front combination lamp (LH) connector
A-18 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Is front combination lamp (LH) connector A-18 in good
condition?
YES : Go to Step 3.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the turn-signal lamps illuminate
normally.
STEP 3. Check the front turn-signal lamp bulb (LH).
(1) Remove the front turn-signal (LH) lamp bulb.
(2) Verify that the front turn-signal lamp bulb (LH) is not
damaged or burned out.
Q: Is the front turn-signal (LH) lamp bulb in good
condition?
YES : Go to Step 4.
NO : Replace the front turn-signal (LH) lamp bulb. Verify
that the turn-signal lamps illuminate normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-318
STEP 4. Check the ground circuit to the ETACS-ECU.
Measure the resistance at front combination lamp (LH)
connector A-18.
(1) Disconnect front combination lamp (LH) connector A-18
and measure the resistance available at the wiring harness
side of the connector.
(2) Measure the resistance value between terminal 2 and
ground.
The resistance should be 2 ohms or less.
Q: Is the measured resistance 2 ohms or less?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check the wiring harness between front
combination lamp (LH) connector A-18 (terminal 2) and
ground.
Q: Is the wiring harness between front combination lamp
(LH) connector A-18 (terminal 2) and ground in good
condition?
YES : Replace the front combination lamp socket (LH).
Verify that the turn-signal lamps illuminate normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the turn-signal lamps illuminate normally.

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-319
STEP 6. 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 7.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the turn-signal lamps illuminate
normally.
STEP 7. Check the wiring harness between front
combination lamp (LH) connector A-18 (terminal 1) and
ETACS-ECU connector C-219 (terminal 14).

SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)54B-320
NOTE: Also check junction block connector C-214 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-214 is damaged,
repair or replace the damaged component(s) as described in
GROUP 00E, Harness Connector Inspection P.00E-2.
Q: Is the wiring harness between front combination lamp
(LH) connector A-18 (terminal 1) and ETACS-ECU
connector C-219 (terminal 14) in good condition?
YES : Replace the front combination lamp socket (LH).
Verify that the turn-signal lamps illuminate normally.
NO : The wiring harness may be damaged or the
connector(s) may have loose, corroded or damaged
terminals, or terminals pushed back in the connector.
Repair the wiring harness as necessary. Verify that
the turn-signal lamps illuminate normally.
STEP 8. Check side turn signal- lamp (LH) connector A-17
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is side turn-signal lamp (LH) connector A-17 in good
condition?
YES : Go to Step 9.
NO : Repair or replace the damaged component(s). Refer
to GROUP 00E, Harness Connector Inspection
P.00E-2. Verify that the turn-signal lamps illuminate
normally.
STEP 9. Check the side turn-signal lamp bulb (LH).
(1) Remove the side turn-signal (LH) lamp bulb.
(2) Verify that the side turn-signal lamp bulb (LH) is not
damaged or burned out.
Q: Is the side turn-signal (LH) lamp bulb in good
condition?
YES : Go to Step 10.
NO : Replace the side turn-signal (LH) lamp bulb. Verify
that the turn-signal lamps illuminate normally.