Mitsubishi Galant 9G. Manual — part 119

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-472

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).

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209799

2019 18 1716 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

AB

CONNECTOR C-219
(JUNCTION BLOCK SIDE)

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-473

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 light switch.

.

AC305415

HARNESS SIDE

JUNCTION BLOCK
(FRONT VIEW)

CONNECTOR: C-215

AV

FOG LIGHT
SWITCH

ETACS-ECU

Fog Light Switch Input Circuit

AC305231

CONNECTOR: C-128

BB

AC305413AL

CONNECTOR: C-218

C-218 (GR)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-474

CIRCUIT OPERATION

The ETACS-ECU operates the fog lights according to
signal from the fog light switch.

.

TECHNICAL DESCRIPTION (COMMENT)

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

.

TROUBLESHOOTING HINTS

• The fog light 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 light switch connector C-128 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.
Q: Is fog light 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 light switch. If the fog light

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

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

P.54A-126

. Then check continuity between the switch termi-

nals.

Q: Is the fog light switch in good condition?

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

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

AC305231

AC305231

HARNESS SIDE

CONNECTOR: C-128

BS

SWITCH
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

Released

1

− 2

Open circuit

Pressed

1

− 2

Less than 2 ohms

AC205430

AB

6

5

3

2

4

1

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-475

STEP 3. Check the ground circuit to the fog light switch.
Measure the resistance at fog light switch connector
C-128.
(1) Disconnect fog light 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 light switch
connector C-128 (terminal 2) and ground.
Q: Is the wiring harness between fog light 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 light
switch operates normally, a correct signal is sent from
the fog light 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 light switch operates normally, a

correct signal is sent from the fog light switch.

AC305231

AC305231

HARNESS SIDE

CONNECTOR: C-128

BS

1

2

4

5

3

6

AC210169

CONNECTOR C-128
(HARNESS SIDE)

AC

AC305231

AC305231

HARNESS SIDE

CONNECTOR: C-128

BS

AC305413AN

CONNECTOR: C-218

JUNCTION BLOCK
(REAR VIEW)

C-218 (GR)

HARNESS SIDE

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74