Mitsubishi Lancer Evolution IX. Manual - part 120

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-43

DIAGNOSTIC PROCEDURE

Step 1. Connector check: C-226 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Step 2. Voltage measurement at the C-226 
ETACS-ECU connector

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Voltage between C-226 ETACS-ECU connector 

terminal No.20 and body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

AC310461

Connector: C-226 <RHD>

AE

Junction block side

Junction block 
(rear view)

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

AC310461

Connector: C-226 <RHD>

AE

Junction block side

Junction block 
(rear view)

AC310507AB

Connector C-226 
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-44

Step 3. Check the wiring harness between C-226 
ETACS-ECU connector terminal No.20 and 
battery.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-05, intermediate connector C-129 and 
junction block connector C-210, and repair if neces-
sary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

AC310461

Connector: C-226 <RHD>

AE

Junction block side

Junction block 
(rear view)

AC310447

Connectors: C-05, C-129 <LHD>

C-05 (GR)

C-129

C-05

C-129

AC

AC310455

Connectors: C-05, C-129 <RHD>

C-05 (GR)

C-129

C-05

C-129

AB

AC310448

Harness side

Junction block (front view)

Connector: C-210 <LHD>

AD

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AC310458

Harness side

Junction block (front view)

Connector: C-210 <RHD>

AD

10

1

6

14

5

12

13

4

11

7

2

3

8

9

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-45

Step 4. Resistance measurement at the C-226 
ETACS-ECU connector

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Continuity between C-226 ETACS-ECU 

connector terminal No.3 and body earth.

OK: 2

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

Step 5. Check the wiring harness between C-226 
ETACS-ECU connector terminal No.3 and body 
earth.

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector C-214, and repair if necessary.

• Check the earth wires for open circuit.

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

AC310461

Connector: C-226 <RHD>

AE

Junction block side

Junction block 
(rear view)

AC310506AC

Connector C-226 
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

AC310461

Connector: C-226 <RHD>

AE

Junction block side

Junction block 
(rear view)

AC310448

Harness side

Junction block (front view)

Connector: C-214 <LHD>

AE

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13

AC310458

Harness side

Junction block (front view)

Connector: C-214 <RHD>

AE

21

7

16 15

17

18

20 19

1

2

3

4

5

6

23 22

24

25

28

26

27

9

8

10

11

14

12

13

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-46

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Repair the wiring harness.

Step 6. Retest the system.
Check that the battery power supply circuit to the 
ETACS-ECU is normal.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

NO : 

Replace the ETACS-ECU.

BUZZER

INSPECTION PROCEDURE B-1: Lamp reminder buzzer function does not work normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU operates this function in accord-
ance with the input signals below.

• Ignition switch (IG1)

• Driver's door switch

• Tail lamp switch

• Headlamp switch

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be defec-
tive.

POSSIBLE CAUSES

• Malfunction of the driver's door switch

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK 
(OFF) position, check if the hazard warning lamps 
illuminate.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure A-2 "Check 
the battery power supply circuit to the 
ETACS-ECU 

P.54B-42

."

ETACS-ECU

INPUT SIGNAL

· FRONT DOOR SWITCH (RH) <RHD>
· FRONT DOOR SWITCH (LH) <LHD>
· HEADLAMP SWITCH
· IGNITION SWITCH (IG1)
· TAIL LAMP SWITCH

Lamp Reminder Tone Alarm Function