Mitsubishi 380. Manual — part 68
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)
54B-269
STEP 1. Use Diagnostic Tool MB991958 to select "ECU
COMM Check" on the SWS monitor display.
Check the following ECUs:
• Column switch (column-ECU)
• Front-ECU
CAUTION
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
."
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate Diagnostic Tool MB991958 according to the
procedure below to display "ECU COMM Check."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "ECU COMM Check."
(4) Diagnostic Tool MB991958 should show "OK" on the "ECU
COMM Check" menus for both the "COLUMN ECU" and
the "FRONT ECU" menus.
Q: Is "OK" displayed for both the "COLUMN ECU" and
"FRONT ECU" menus?
"OK" is displayed for all the items : Go to Step 2.
"NG" is displayed for the "COLUMN ECU" menu : Refer
to Inspection Procedure A-2 "Communication with the
column switch (column-ECU) is not possible
."
"NG" is displayed for the "FRONT ECU" menu : Refer to
Inspection Procedure A-4 "Communication with the
front-ECU is not possible
."
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC302210
COLUMN SWITCH
CONNECTOR
COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE
MB991812
AB
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)
54B-270
STEP 2. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:
• Ignition switch: ON
• Lighting switch: HEAD
• Dimmer switch: ON
(1) Operate Diagnostic Tool MB991958 according to the
procedure below to display "HEADLAMP HI."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f.
Select "LIGHTING."
g. Select "HEADLAMP HI."
(2) Check that normal conditions are displayed for the items
described in the table below.
Q: Does the Diagnostic Tool MB991958 display the items
"HEADLAMP SW", "DIMMER SW", "H/L AUTO-CUT" and
"FRONT ECU ACK" as normal condition?
Normal conditions are displayed for all the items :
Replace the front-ECU. Verify that the headlamps
(high-beam) illuminate normally.
Normal condition is not displayed for "HEADLAMP SW"
:
Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the headlamp switch
."
Normal condition is not displayed for "DIMMER SW" :
Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the dimmer switch
."
Normal condition is not displayed for "H/L AUTO-CUT" :
Refer to Inspection Procedure H-9 "Headlamp
automatic shutoff function does not work normally
."
Normal condition is not displayed for "FRONT ECU
ACK" : Replace the front-ECU. Verify that the headlamps
(high-beam) illuminate normally.
ITEM NO.
ITEM NAME
NORMAL CONDITION
ITEM 00
HEADLAMP SW
ON
ITEM 02
DIMMER SW
OFF (should turn "ON"
momentarily when the
dimmer switch is operated)
ITEM 35
H/L AUTO-CUT
OFF
ITEM 70
FRONT ECU ACK
HI-BEAM ACK
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC302210
COLUMN SWITCH
CONNECTOR
COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE
MB991812
AB
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)
54B-271
INSPECTION PROCEDURE H-4: Headlamp and Taillamp: When the passing switch is turned "ON," the
headlamps (low-beam or high-beam) do not illuminate.
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
."
.
TECHNICAL DESCRIPTION (COMMENT)
If both of the headlamps (low-beam and high-beam)
do not illuminate, the input circuit from the passing
switch or the front-ECU may be defective.
.
TROUBLESHOOTING HINTS
• Refer to circuit diagrams GROUP-
• Refer to configuration diagrams GROUP-
• 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 front-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 headlamps.
Q: Do the headlamps (low-beam and high-beam) illuminate
normally?
The headlamps illuminate normally. : Go to Step 2.
Headlamps (low-beam) do not illuminate normally :
Refer to Inspection Procedure H-2 "The headlamps
(low-beam) do not illuminate normally
Headlamps (high-beam) do not illuminate normally :
Refer to Inspection Procedure H-3 "The headlamps
(high-beam) do not illuminate normally
.
SYMPTOM PROCEDURES
SIMPLIFIED WIRING SYSTEM (SWS)
54B-272
STEP 2. Check the input signal by using "DATA LIST"
menu of the SWS monitor.
Turn the passing switch to the "ON" position before checking
input signals from the passing switch.
CAUTION
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
."
(2) Operate Diagnostic Tool MB991958 according to the
procedure below to display "COLUMN ECU."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Data List."
f.
Select "COLUMN ECU."
(3) Check that normal conditions are displayed for the items
described in the table below.
Q: Does the Diagnostic Tool MB991958 display "PASSING
SW" as normal condition?
YES : Replace the front-ECU. When the passing switch is
turned "ON", the headlamps (low-beam and
high-beam) should illuminate normally.
NO : Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the passing switch
."
ITEM NO.
ITEM NAME
NORMAL CONDITION
ITEM 03
PASSING SW
ON
00DB076A
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
AC302210
COLUMN SWITCH
CONNECTOR
COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE
MB991812
AB
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