Mitsubishi Galant 9G. Manual — part 120

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-476

STEP 6. Check the wiring harness between fog light switch
connector C-128 (terminal 1) and ETACS-ECU connector
C-218 (terminal 54).
Q: Is the wiring harness between fog light switch

connector C-128 (terminal 1) and ETACS-ECU connector
C-218 (terminal 54) in good condition?
YES : Replace the ETACS-ECU. If the fog light switch

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

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

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-477

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

JUNCTION
BLOCK

ETACS-
ECU

JUNCTION BLOCK SIDE

FRONT DOOR
SWITCH (LH)

FRONT DOOR
SWITCH (RH)

Front Door Switches Input Circuit

AC305233

CONNECTOR: C-13

AR

AC305415AL

CONNECTOR: C-204

JUNCTION BLOCK

(FRONT VIEW)

AC305413AB

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)

AC400532

CONNECTOR: D-22

AH

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-478

.

CIRCUIT OPERATION

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

• Ignition key reminder tone alarm function <front

door switch (LH)>

• Light reminder tone alarm function <front door

switch (LH)>

• Door ajar warning buzzer

• Forgotten key reminder

• Power window timer function

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

• Keyless entry system

• Timed locking mechanism

• Headlight automatic shutdown function <front

door switch (LH)>

• Dome light

• Interior light automatic-shutdown function

• Ignition key hole illumination light <front door

switch (LH)>

• Door-ajar indicator light

.

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

• 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

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

AC400530

CONNECTOR: D-34

AL

INPUT SIGNAL PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-479

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 scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect the scan tool MB991958.Refer to "How to connect

SWS monitor

P.54B-13

."

(2) Operate scan 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 scan tool MB991958 sounds.
Q: Does scan tool MB991958 sound when each front door

is opened and closed?
When the front door (LH) is opened and closed, scan
tool MB991958 does not sound. : Go to Step 2.
When the front door (RH) is opened and closed, scan
tool MB991958 does not sound. : Go to Step 7.
When either front door is opened and closed, scan 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 (LH) connector D-22 for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Is front door switch (LH) connector D-22 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 (LH) should be normal.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC400532

HARNESS SIDE

CONNECTOR: D-22

AG