Mitsubishi Montero (2004+). Manual — part 777
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-365
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" to "OFF"
• Lighting switch: "TAIL" or "HEAD"
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect the special tool. Refer to "How to connect SWS
monitor
.
(2) Operate scan tool MB991958 according to the procedure
below to display "H/L AUTO-CUT."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "FUNCTION DIAG."
5. Select "LIGHTING."
6. Select "H/L AUTO-CUT."
(3) Check that normal conditions are displayed on the items
described in the table below.
(4) When the driver's door is opened, Check that normal
conditions are displayed on the items described in the table
below.
Q: Are normal conditions displayed on the "TAILLIGHT
SW", "IG SW (IG1)", "FRONT DOOR SW" and "H/L
AUTO-CUT"?
Normal conditions are displayed for all the items :
Replace the front-ECU. Verify that the headlight
automatic shutdown function now works normally.
Normal condition is not displayed on the "TAIL LIGHT
SW" : Refer to Inspection Procedure O-6 "ETACS-ECU
does not receive any signal from the taillight switch
Normal condition is not displayed on the "IG SW (IG1)" :
Refer to Inspection Procedure O-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1)
Normal condition is not displayed on the "FRONT
DOOR SW" : Refer to Inspection Procedure O-5
"ETACS-ECU does not receive any signal from the
ITEM NO.
ITEM NAME
NORMAL CONDITION
ITEM 01
TAILLIGHT SW
ON
ITEM 30
IG SW (IG1)
OFF
ITEM NO. ITEM NAME
NORMAL CONDITION
ITEM 32
FRONT DOOR SW ON
ITEM 35
H/L AUTO-CUT
ON
AC309091
MB991911
MB991827
MB991824
AB
MB991806
MB991862
DATA LINK
CONNECTOR
(16-PIN)
DATA LINK
CONNECTOR
(13-PIN)
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-366
driver's or the front passenger's door switch
Normal condition is not displayed on the "H/L
AUTO-CUT" : Replace the front-ECU. Verify that the
headlight automatic shutdown function now works
normally.
INSPECTION PROCEDURE J-10: Headlight and Taillight: Headlight dimmer switch automatic resetting
function does not work normally.
.
CIRCUIT OPERATION
The headlight dimmer switch automatic resetting
function is controlled by the front-ECU.
.
TECHNICAL DESCRIPTION (COMMENT)
If the headlight dimmer switch automatic resetting
function does not work normally, the front-ECU may
be defective.
.
TROUBLESHOOTING HINT
The front-ECU may be defective
DIAGNOSIS
Replace the front-ECU.
Verify that the headlight dimmer switch automatic resetting
function now works normally.
Headlight (Dimmer/Passing) Input Signal
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-367
INSPECTION PROCEDURE J-11: Headlight and Taillight: Daytime running light function does not
work normally. <vehicles for Canada>
.
TECHNICAL DESCRIPTION (COMMENT)
If the daytime running light function is not operating
normally the daytime running light-ECU power circuit
may be defective or the daytime running light-ECU
may be defective.
.
TROUBLESHOOTING HINTS
• The daytime running light-ECU may be defective
• The wiring harness or connectors may have
loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
BATTERY
RELAY
BOX
JOINT
CONNECTOR (3)
FRONT-ECU
HEADLIGHT
(LH)
FIELD EFFECT
TRANSISTOR FOR
HEADLIGHT, LOW
PULSE WIDTH
MODULATION
(RH)
Daytime Running Light Circuit
SYMPTOM PROCEDURES
TSB Revision
SIMPLIFIED WIRING SYSTEM (SWS)
54B-368
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
• MB991862: SWS Monitor Kit
STEP 1. Verify the headlight (low-beam) operation.
Check to see that the headlight (low-beam) lights up properly
when operating the dimmer switch while the headlight switch is
ON.
Q: Do the headlights (low-beam) illuminate normally?
YES : Go to Step 2.
NO : Refer to Inspection Procedure J-2 "Headlights
(low-beam) do not illuminate normally
."
STEP 2. Use scan tool MB991958 to select "ECU COMM
CHK" on the SWS monitor display.
Check the following ECUs:
• Front-ECU
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958. Connect
the DLC harness before connecting the column-ECU har-
ness. Be sure to connect SWS monitor kit MB991862 after
turning on scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Connect SWS monitor kit MB991862 to the column switch
connector.
(3) Turn the ignition switch to the "ON" position.
(4) Operate scan tool MB991958 according to the procedure
below to display "ECU COMM CHK."
1. Select "SYSTEM SELECT."
2. Select "SWS."
3. Select "SWS MONITOR."
4. Select "ECU COMM CHK."
(5) Scan tool MB991958 should show "OK" on the "ECU
COMM CHK" menu for the "FRONT ECU" menu.
Q: Is "OK" displayed on the "FRONT ECU" menu?
YES : Replace the front-ECU. The daytime running light
function should now work normally.
NO : Refer to Inspection procedure A-4 "Communication
with the front-ECU is not possible
."
AC309091
MB991911
MB991827
MB991824
AB
MB991806
MB991862
DATA LINK
CONNECTOR
(16-PIN)
DATA LINK
CONNECTOR
(13-PIN)
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