Mitsubishi 380. Manual - part 110

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-437

STEP 2. Check the hazard warning lamp switch.
Remove the hazard warning lamp switch. Refer to GROUP 
54A, Hazard Warning Light Switch 

P.54A-168

. Then check 

continuity between the switch terminals.

Q: Is the hazard warning lamp switch in good condition?

YES : Go to Step 3.
NO :  Replace the hazard warning lamp switch. If the 

equipment described in "CIRCUIT OPERATION", 
work normally the input signal from the hazard 
warning lamp switch should be normal.

STEP 3. Check the ground circuit to the hazard warning 
lamp switch. Measure the resistance at hazard warning 
lamp switch connector C-08.
(1) Disconnect hazard warning lamp switch connector C-08 

and measure the resistance available at the wiring harness 
side of the connector.

(2) Measure the resistance value between terminal 2 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 :  Go to Step 4.

SWITCH 
POSITION

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Released

1 

− 2

Open circuit

Pressed

1 

− 2

Less than 2 ohms

AC307450

16DB463A

CONNECTOR: C-08

HARNESS SIDE

AC209364GW

CONNECTOR C-08
(HARNESS SIDE)

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-438

STEP 4. Check the wiring harness between hazard warning 
lamp switch connector C-08 (terminal 2) and ground.
Q: Is the wiring harness between hazard warning lamp 

switch connector C-08 (terminal 2) and ground in good 
condition?
YES : No action is necessary and testing is complete.
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 
equipment described in "CIRCUIT OPERATION" work 
normally, the input signal from the hazard warning 
lamp switch should be normal.

STEP 5. Check ETACS-ECU connector C-218 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.
Q: Is ETACS-ECU connector C-218 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 equipment described in "CIRCUIT 

OPERATION" work normally, the input signal from the 
hazard warning lamp switch should be normal.

16DB463A

CONNECTOR: C-08

HARNESS SIDE

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

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-439

STEP 6. Check the wiring harness between hazard warning 
lamp switch connector C-08 (terminal 1) and ETACS-ECU 
connector C-218 (terminal 49).
Q: Is the wiring harness between hazard warning lamp 

switch connector C-08 (terminal 1) and ETACS-ECU 
connector C-218 (terminal 49) in good condition?
YES : Replace the ETACS-ECU. If the equipment described 

in "CIRCUIT OPERATION" work normally, the input 
signal from the hazard warning lamp switch should be 
normal.

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 
equipment described in "CIRCUIT OPERATION" work 
normally, the input signal from the hazard warning 
lamp switch should be normal.

16DB463A

CONNECTOR: C-08

HARNESS SIDE

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

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-440

INSPECTION PROCEDURE N-3: ETACS-ECU does not receive any signal from any of the door 
switches.

.

CIRCUIT OPERATION

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

• Light reminder tone alarm function <front door 

switch (RH)>

• Door ajar warning buzzer <all door switches>

• Ignition key reminder tone alarm <front door 

switches>

• Power window timer function <front door 

switches>

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

door switch (RH)>

• Keyless entry system <all door switches>

• Timer lock <all door switches>

• Dome lamp <all door switches>

• Interior lamp automatic-shutdown function <all 

door switches>

• Ignition key hole illumination lamp <front door 

switch (RH)>

• Door-ajar indicator lamp <all door switches>

.

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 or rear 
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 or rear 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

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

16DB324A

CONNECTOR: C-204

HARNESS SIDE

16DB305A

C-219

C-217

CONNECTORS: C-217, C-219

JUNCTION BLOCK

(REAR VIEW)

16DB464A

CONNECTORS: D-06, D-16

D-06

D-16

HARNESS SIDE