Mitsubishi Galant (2004+). Manual — part 234
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-127
STEP 6. Check the input signal (by using the pulse check
mode of the monitor).
Check the following switches and input signals:
• Doors switches
(1) Operate scan 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 scan tool MB991958 sounds or not.
Q: When any door switch is operated, does scan tool
MB991958 sound?
YES : Replace the ETACS-ECU. The door ajar warning
buzzer function should now work normally.
NO : Refer to Inspection Procedure N-3 "ETACS-ECU
does not receive any signal from any of the door
switches
."
ITEM NAME
CONDITION
door switch
Open or close one of the doors
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
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INSPECTION PROCEDURE B-5: Tone Alarm: The Multi center Display does not Sound Normally When
it is Operated. <Multi center Display (Middle-grade Type)>
NOTE: This troubleshooting procedure requires the
use of scan tool MB991958 and SWS monitor kit
MB991813. For details on how to use the SWS mon-
itor, refer to "How to use SWS monitor
.
CIRCUIT OPERATION
The ETACS-ECU sounds the buzzer when it
receives buzzer signal from the multi center display
(middle-grade type).
.
TECHNICAL DESCRIPTION (COMMENT)
If this function does not work normally, connector(s),
wiring harness in the CAN bus lines, the mid-
dle-grade multi center display unit or the
ETACS-ECU may be defective.
.
TROUBLESHOOTING HINTS
• 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
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan 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: Probe Harness
STEP 1. Check the operation of the multi center display
(middle-grade type).
Q: Does the multi center display (middle-grade type) work
normally?
YES : Go to Step 2.
NO : First, replace the multi center display (middle-grade
type) unit.
ETACS-
ECU
MULTI CENTER
DISPLAY UNIT
CAN COMMUNICATION LINE
(CAN_L LINE)
CAN COMMUNICATION LINE
(CAN_H LINE)
Multi Center Display Annunciation Function
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
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STEP 2. Using scan tool MB991958, diagnose the CAN bus
line.
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 scan tool MB991958. Refer to "How to connect
."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the CAN bus line found to be normal?
YES : Go to Step 3.
NO : Repair the CAN bus line (Refer to GROUP 54C,
STEP 3. Using scan tool MB991958, read the multi center
display (middle-grade type) diagnostic trouble code.
Check that a multi center display DTC is set.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the multi center display DTC is set.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Diagnose the multi center display unit (middle-grade
type) (Refer to GROUP 54A, Diagnosis
).
NO : Go to Step 4.
AC305412
AB
MB991910
DATA LINK
CONNECTOR
MB991824
MB991827
SYMPTOM PROCEDURES
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SIMPLIFIED WIRING SYSTEM (SWS)
54B-130
STEP 4. Use scan tool MB991958 to select "ECU COMM
Check" on the SWS monitor display.
Check the ETACS-ECU.
CAUTION
Connect special tool MB991910 before connecting special
tool MB991812. Be sure to connect special tool MB991806
after turning on special tool MB991824.
(1) Connect the SWS monitor. Refer to "How to connect SWS
monitor
."
(2) Turn the ignition switch to the "ON" position.
(3) Operate scan 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) Scan tool MB991958 should show "OK" on the "ECU
COMM Check" menu for the "ETACS ECU" menu.
Q: Is "OK" displayed for the "ETACS ECU" menu?
YES : Go to Step 5.
NO : Refer to Inspection Procedure A-3 "Communication
with the ETACS-ECU is not possible
."
AC305411AB
MB991910
DATA LINK
CONNECTOR
MB991827
MB991824
MB991806
MB991812
AC302210
COLUMN SWITCH
CONNECTOR
COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE
MB991812
AB
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