Mitsubishi 380. Manual - part 104

 

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Mitsubishi 380. Manual - part 104

 

 

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-413

STEP 6. Check the wiring harness between fog lamp 
switch connector C-128 (terminal 1) and ETACS-ECU 
connector C-218 (terminal 48).
Q: Is the wiring harness between fog lamp switch 

connector C-128 (terminal 1) and ETACS-ECU connector 
C-218 (terminal 48) in good condition?
YES : 
Replace the ETACS-ECU. If the fog lamp switch 

operates normally, a correct signal is sent from the 
fog lamp switch.

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. If the fog 
lamp switch operates normally, a correct signal is sent 
from the fog lamp switch.

INSPECTION PROCEDURE M-4: ETACS-ECU does not receive any signal from the front door 
switches.

.

16DB458A

HARNESS SIDE

CONNECTOR: C-128

54DB006A

CONNECTORS: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

45

46

48 47

49

50
59

51
60

52

53
62

65

61

54
63

56

68

64

67 66

57

58

55

16DB324A

CONNECTOR: C-204

HARNESS SIDE

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

16DB461A

CONNECTORS: D-22, D-34

D-34

D-22

HARNESS SIDE

 D-22, D-34

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-414

CIRCUIT OPERATION

The ETACS-ECU operates the following functions or 
systems according to signal from the front door 
switches:

• Light reminder tone alarm function <front door 

switch (RH)>

• Door ajar warning buzzer

• Forgotten key reminder

• Power window timer function

• Sunroof timer function <front door switch (RH)>

• Keyless entry system

• Timed locking mechanism
• Headlamp automatic shutdown function <front 

door switch (RH)>

• Dome lamp

• Interior lamp automatic-shutdown function

• Ignition key hole illumination lamp <front door 

switch (RH)>

• Door-ajar indicator lamp

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the functions or systems 
described in "CIRCUIT OPERATION" do not work 
normally. If the signal is not normal, the front door 
switches or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The front door switches may be defective

• 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

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-415

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 input signal (by using the pulse check 
mode of the monitor).
Check the input signals from the front door switches.

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 the 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) Check that diagnostic tool MB991958 sounds.

Q: Does diagnostic tool MB991958 sound when each front 

door is opened and closed?
When the front door (RH) is opened and closed, 
diagnostic tool MB991958 does not sound. : 
Go to Step 

2.

When the front door (LH) is opened and closed, 
diagnostic tool MB991958 does not sound. : 
Go to Step 

7.

When either front door is opened and closed, diagnostic 
tool MB991958 sounds.  : 
Replace the ETACS-ECU. If the 

functions described in "CIRCUIT OPERATION" work 
normally, the input signal from the front door switches 
should be normal.

STEP 2. Check front door switch (RH) connector D-34 for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector. 
Q: Is front door switch (RH) connector D-34 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

. If the functions described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
front door switch (RH) should be normal.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

16DB461A

CONNECTORS: D-22, D-34

D-34

D-22

HARNESS SIDE

 D-22, D-34

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-416

STEP 3. Check the front door switch (LH).
Remove the front door switch (RH). Refer to GROUP 42, Door, 
Door Assembly 

P.42-37

. Then check continuity between the 

switch terminals and the body ground.

Q: Is the front door switch (LH) in good condition?

YES : Go to Step 4.
NO :  Replace the front door switch (RH). If the functions 

described in "CIRCUIT OPERATION" work normally, 
the input signal from the front door switch (RH) should 
be normal.

STEP 4. Measure resistance at the lower metal part of the 
front door switch (RH) in order to check the ground circuit 
to the front door switch (RH).

NOTE: Check that the front door switch (RH) is grounded to the 
vehicle body via its mounting screw.
Remove the cap, and measure the resistance value between 
the lower metal part and ground. 

• The resistance should be 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 5.
NO :  Check the installation of the switch, and repair if 

necessary. If the functions described in "CIRCUIT 
OPERATION" work normally, the input signal from the 
front door switch (RH) should be normal.

STEP 5. 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 6.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. If the functions described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
front door switch (LH) should be normal.

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Released (ON)

− body ground

Less than 2 ohms

Pressed (OFF)

− body ground

Open circuit

1 2 3

ACX01865AC

ON

OFF

AC210276AB

METAL PART

CUP

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

 

 

 

 

 

 

 

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