Mitsubishi Galant 9G. Manual - part 94

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-372

STEP 5. Check the battery 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) Measure the voltage between terminal 11 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. Verify that the turn-signal

lights illuminate normally.

NO : Go to Step 6.

STEP 6. Check the wiring harness between ETACS-ECU
connector C-219 (terminal 11) and the battery.

NOTE: Also check junction block connector C-214 for loose,
corroded, or damaged terminals, or terminals pushed back in
the connector. If junction block connector C-214 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 11) and the battery 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. Verify that
the turn-signal lights illuminate normally.

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209891

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

CONNECTOR C-219
(JUNCTION BLOCK SIDE)

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC305415

C-214

CONNECTOR: C-214

JUNCTION BLOCK
(FRONT VIEW)

HARNESS SIDE

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-373

STEP 7. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
Check the input signals from the following switches:

• Ignition switch: ON

• Turn-signal light switch: RH

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. Connect
special tool MB991910 before connecting special tool
MB991812. Be sure to connect special tool MB991806 after
turning on special tool MB991824.
(1) Connect the special tool. Refer to "How to connect SWS

monitor

P.54B-13

(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Operate scan tool MB991958 according to the procedure

below to display "TURN SIG.RH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "TURN SIGNAL."
g. Select "TURN SIG.RH."

(4) Check that normal conditions are displayed for the items

described in the table below.

Q: Does the scan tool MB991958 display the items "T/S RH

SW" and "IG SW (IG1)" as normal condition?
Normal conditions are displayed for all the items : Go to

Step 8.

Normal condition is not displayed for "T/S RH SW" :

Refer to Inspection Procedure M-5 "ETACS-ECU
does not receive any signal from the turn-signal light
switch

P.54B-484

Normal condition is not displayed for "IG SW (IG1)" :

Refer to Inspection Procedure M-2 "ETACS-ECU
does not receive any signal from the ignition switch
(IG1)

P.54B-470

ITEM NO.

ITEM NAME

NORMAL CONDITION

ITEM 10

T/S RH SW

ITEM 30

IG SW (IG1)

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-374

STEP 8. Check the input signal by using "FUNCTION
DIAG." menu of the SWS monitor.
If the Ignition switch is turned to the "ON" position and the
turn-signal light switch (LH) is turned on, normal conditions
should be displayed for the items described in the table below.
(1) Operate scan tool MB991958 according to the procedure

below to display "TURN SIG.LH."
a. Select "Interactive Diagnosis."
b. Select "System select."
c. Select "SWS."
d. Select "SWS MONITOR."
e. Select "Function Diag."
f. Select "TURN SIGNAL."
g. Select "TURN SIG.LH."

(2) Check that normal conditions are displayed for the item

described in the table below.

Q: Do the scan tool display the item "T/S LH SW" as

normal condition?
YES : Replace the ETACS-ECU. Verify that the turn-signal

lights illuminate normally.

NO : Refer to Inspection Procedure M-5 "ETACS-ECU

does not receive any signal from the turn-signal light
switch

P.54B-484

ITEM No.

ITEM NAME

NORMAL CONDITION

ITEM 11

T/S LH SW

AC305411AB

MB991910

DATA LINK

CONNECTOR

MB991827

MB991824

MB991806

MB991812

AC302210

COLUMN SWITCH
CONNECTOR

COLUMN SWITCH
CONNECTOR AT
HARNESS SIDE

MB991812

SYMPTOM PROCEDURES

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SIMPLIFIED WIRING SYSTEM (SWS)

54B-375

INSPECTION PROCEDURE I-2: Flasher Timer: Hazard warning lights do not flash when the hazard
warning light switch is turned on.

CIRCUIT OPERATION

If the ETACS-ECU receives "ON" signal from the
hazard warning light switch, the ETACS-ECU turns
on the flasher timer (incorporated in the
ETACS-ECU), thus causing the turn-signal lights to
flash.

TECHNICAL DESCRIPTION (COMMENT)

If the hazard warning lights do not flash, the power
supply line to the ETACS-ECU (dedicated to the
turn-signal lights) or the ETACS-ECU may be defec-
tive.

TROUBLESHOOTING HINTS

• Trouble in input signal system

• 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

BATTERY

RELAY
BOX

HAZARD
WARNING
LIGHT SWITCH

· FRONT COMBINATION
LIGHT (LH)
· REAR COMBINATION
LIGHT (LH)

· FRONT COMBINATION
LIGHT (RH)
· REAR COMBINATION
LIGHT (RH)

ETACS-ECU

TURN-SIGNAL
LIGHT RELAY: LH

TURN-SIGNAL
LIGHT RELAY: RH

JUNCTION BLOCK SIDE

JUNCTION BLOCK

Hazard Warning Light Circuit

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