Mitsubishi 380. Manual — part 103

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-409

STEP 2. Check the ignition switch (IG1) line of the power
supply circuit to the ETACS-ECU. Measure the voltage at
ETACS-ECU connector C-219.
(1) Disconnect ETACS-ECU connector C-219 and measure the

voltage available at the junction block side of the connector.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal 8 and ground.

• The voltage should measure approximately 12 volts

(battery positive voltage).

Q: Is the measured voltage approximately 12 volts (battery

positive voltage)?
YES : Replace the ETACS-ECU. If the functions described

in "CIRCUIT OPERATION" work normally, the input
signal from the ignition switch (IG1) should be normal.

NO : Go to Step 3.

STEP 3. Check the wiring harness between ETACS-ECU
connector C-219 (terminal 8) and the ignition switch (IG1).

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209799

201918 171615 1413 1211 10 9 8 7 6 5 4 3 2 1

AB

CONNECTOR C-219
(JUNCTION BLOCK SIDE)

54DB014A

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-410

NOTE: Also check junction block connector C-215 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-215 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 ETACS-ECU connector

C-219 (terminal 8) and ignition switch (IG1) 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
functions described in "CIRCUIT OPERATION" work
normally, the input signal from the ignition switch
(IG1) should be normal.

INSPECTION PROCEDURE M-3: ETACS-ECU does not receive any signal from the fog lamp switch.

.

16DB457A

CONNECTOR: C-215

C-215

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

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-411

CIRCUIT OPERATION

The ETACS-ECU operates the fog lamps according
to signal from the fog lamp switch.

.

TECHNICAL DESCRIPTION (COMMENT)

If the signal is not normal, the fog lamps do not work
normally. If the signal is not normal, the fog lamp
switch or the ETACS-ECU may be defective.

.

TROUBLESHOOTING HINTS

• Refer to circuit diagrams GROUP-

90

• Refer to configuration diagrams GROUP-

80

• The fog lamp switch 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 Tool:

• MB991223: Harness Set

STEP 1. Check fog lamp switch connector C-128 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog lamp switch connector C-128 in good condition?

YES : Go to Step 2.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

. Repair the fog lamp switch. If the fog lamp

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

STEP 2. Check the fog lamp switch.
Remove the fog lamp switch. Refer to GROUP 54A, Fog lamp

P.54A-168

. Then check continuity between the switch termi-

nals.

Q: Is the fog lamp switch in good condition?

YES : Go to Step 3.
NO : Repair the fog lamp switch. If the fog lamp switch

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

16DB458A

HARNESS SIDE

CONNECTOR: C-128

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released

1

− 2

Open circuit

Pressed

1

− 2

Less than 2 ohms

16DB459A

INPUT SIGNAL PROCEDURES

SIMPLIFIED WIRING SYSTEM (SWS)

54B-412

STEP 3. Check the ground circuit to the fog lamp switch.
Measure the resistance at fog lamp switch connector
C-128.
(1) Disconnect fog lamp switch connector C-128 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.

STEP 4. Check the wiring harness between fog lamp
switch connector C-128 (terminal 2) and ground.
Q: Is the wiring harness between fog lamp switch

connector C-128 (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 fog
lamp switch operates normally, a correct signal is sent
from the fog lamp switch.

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 fog lamp switch operates normally, a

correct signal is sent from the fog lamp switch.

16DB458A

HARNESS SIDE

CONNECTOR: C-128

1

2

4

5

3

6

16DB460A

CONNECTOR C-128
(HARNESS SIDE)

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