Mitsubishi 380. Manual - part 52

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-205

INSPECTION PROCEDURE E-4: Keyless Entry System: The trunk is not opened when the keyless 
entry transmitter "TRUNK" button is operated.

.

CIRCUIT OPERATION

A receiver is incorporated in the ETACS-ECU. This 
receiver receives a lock or unlock signal from the 
transmitter.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The RKE transmitter may be defective

• The ETACS-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: 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 that the doors can be locked and unlocked 
by using the keyless entry transmitter.

Q: Can the doors be locked and unlocked normally when 

the keyless entry transmitter is operated?
YES : Go to Step 2.
NO :  Refer to Inspection Procedure E-1 "Keyless entry 

system does not operate 

P.54B-191

."

16DB350A

CONNECTOR:C-28

16DB307A

CONNECTOR: C-217

HARNESS SIDE

25

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29

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24

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31

32

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34

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36

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39

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41

42

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44

JUNCTION BLOCK

(REAR VIEW)

AC305260

AC

CONNECTOR: F-05

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-206

STEP 2. Check the input signal (by using the pulse check 
mode of the monitor).
Check input signals from the transmitter.

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.
(1) Connect diagnostic tool MB991958.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) Push the transmitter "TRUNK" button.
(4) Check that diagnostic tool MB991958 sounds

Q: When the transmitter "TRUNK" button is turned ON, 

does diagnostic tool MB991958 sound?
YES : Go to Step 3.
NO :  Refer to Inspection Procedure N-8 "ETACS-ECU 

does not receive any signal from the lock, unlock, 
trunk or panic switch 

P.54B-472

."

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-207

STEP 3. Check trunk lid latch assembly connector F-05 
and ETACS-ECU connector C-217 for loose, corroded or 
damaged terminals, or terminals pushed back in the 
connector.
Q: Is trunk lid latch assembly connector F-05 and 

ETACS-ECU connector C-217 in good condition?
YES : Go to Step 4.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Check that the headlamps illuminate 

normally.

STEP 4. Check the trunk lid latch assembly.
Remove the trunk lid latch assembly. Refer to GROUP 42, 
Trunk lid, Trunk lid latch inspection 

P.42-65

.

Q: Does the windshield washer motor operate normally?

YES : Go to Step 5.
NO :  Replace the trunk lid latch assembly. Verify that the 

windshield washer works normally.

16DB307A

CONNECTOR: C-217

HARNESS SIDE

25

26

27

28

29

21

22

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24

30

31

32

33

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36

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39

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41

42

43

44

JUNCTION BLOCK

(REAR VIEW)

AC305260

CONNECTOR: F-05

AI

HARNESS SIDE

LEVER POSITION TESTER 

CONNECTION

SPECIFIED 
CONDITION

ON (Latch open)

2 

− Ground 

Less than 2 ohms

OFF (Latch shut)

2 

− Ground 

Open circuit

1 2

<FRONT 
VIEW>

ON

OFF

LEVER

16DB424A

SYMPTOM PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-208

STEP 5. Check the wiring harness between trunk lid latch 
assembly connector F-05 (terminal 1) and ETACS-ECU 
connector C-217.

NOTE: Also check intermediate connector C-28 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector C-28 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 trunk lid latch assembly 

connector F-05 (terminal 1) and ETACS-ECU connector 
C-217 in good condition?
YES : Replace the ETACS-ECU. All the doors can be locked 

or unlocked by means of the transmitter.

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. The system 
should communicate with the sunroof-ECU normally.

16DB307A

CONNECTOR: C-217

HARNESS SIDE

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26

27

28

29

21

22

23

24

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

JUNCTION BLOCK

(REAR VIEW)

AC305260

CONNECTOR: F-05

AI

HARNESS SIDE

16DB350A

CONNECTOR:C-28