Mitsubishi Galant (2004+). Manual - part 324

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-487

CIRCUIT OPERATION
The ETACS-ECU operates the following equipment 
and function(s) according to signal from the ignition 
switch (ACC):

• Windshield wiper and washer

• Interior light automatic shutoff function

The ETACS-ECU receives information on the ignition 
switch condition (ACC) from the middle-grade multi 
center display unit via CAN communication. If the 
ignition switch (ACC) input signal is incorrect, refer to 
the appropriate Diagnostic Trouble Code Chart 

P.54B-27

.

.

TECHNICAL DESCRIPTION (COMMENT)
If the signal is not normal, the equipment and func-
tion(s), which are described in "CIRCUIT OPERA-
TION", do not work normally.

.

TROUBLESHOOTING HINTS

• 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 ETACS-ECU connector C-219 for loose, 
corroded or damaged terminals, or terminals pushed back 
in the connector.

Q: Is ETACS-ECU connector C-219 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

. If the equipment described in "CIRCUIT 

OPERATION" works normally, the input signal from 
the ignition switch (ACC) should be normal.

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-488

STEP 2. Check the ignition switch (ACC) 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 "ACC" position.

(3) Measure the voltage between terminal 4 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 equipment described 

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

NO :  Go to Step 3.

STEP 3. Check the wiring harness between ETACS-ECU 
connector C-219 (terminal 4) and the ignition switch (ACC).

AC305413 AG

CONNECTOR: C-219

JUNCTION BLOCK SIDE

JUNCTION BLOCK

(REAR VIEW)

AC209796

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-489

NOTE: Also check intermediate connector C-29 and junction 
block connector C-214 for loose, corroded, or damaged termi-
nals, or terminals pushed back in the connector. If intermediate 
connector C-29 or 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 4) and ignition switch (ACC) 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" 
works normally, the input signal from the ignition 
switch (ACC) should be normal.

AC305231AI

CONNECTOR: C-29

AC305415

C-214

CONNECTOR: C-214

AU

JUNCTION BLOCK
(FRONT VIEW)

HARNESS SIDE

10

1

6

14

5

12

13

4

11

7

2

3

8

9

INPUT SIGNAL PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-490

INSPECTION PROCEDURE M-2: ETACS-ECU does not receive any signal from the ignition switch 
(IG1).

.

CIRCUIT OPERATION
The ETACS-ECU operates the following equipment 
or functions according to signal from the ignition 
switch (IG1):

• Ignition key reminder tone alarm function

• Light reminder tone alarm function

• Seat belt tone alarm function

• Door ajar warning buzzer

• Turn-signal light buzzer

• Multi center display operation tone <vehicles with 

multi center display (middle grade type)>

• Power window timer function

• Sunroof timer function

• Headlight automatic shutdown function

• Turn-signal light

• Dome light dimming function

• Ignition key hole illumination light

• If the power supply circuit from the battery to the 

ETACS-ECU is open, this circuit is used as 
backup circuit.

If the signal is not normal, the equipment or functions 
described in "CIRCUIT OPERATION" do not work 
normally.
The ETACS-ECU receives information on the ignition 
switch condition (IG1) from the combination meter 
via CAN communication. If the ignition switch (IG1) 
input signal is incorrect, refer to the Diagnostic Trou-
ble Code Chart 

P.54B-27

.

.

TROUBLESHOOTING HINTS

• 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

Ignition Switch (IG1) Input Circuit

AC305415AP

CONNECTOR: C-215

AC305413AB

CONNECTOR: C-219

JUNCTION BLOCK

(REAR VIEW)