Mitsubishi Lancer Evolution IX. Manual - part 228

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-171

Step 5. Connector check: C-228 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

Step 6. Check the wiring harness from C-228 
ETACS-ECU connector terminal Nos.69 and 71 to 
C-207 ignition key cylinder illumination lamp 
connector terminal Nos.1 and 2.

AC310450

Connector: C-228 <LHD>

AC

Junction block (rear view)

C-228 (GR)

Harness side

51

52

53

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AC310461

Junction block (rear view)

Connector: C-228 <RHD>

AC

Harness side

C-228 (GR)

51

52

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AC310479

2
7 6

1
3

5 4

Connector: C-207 <LHD>

AE

Harness side

AC310481

2
7 6

1
3

5 4

Connector: C-207 <RHD>

AE

Harness side

AC310450

Connector: C-228 <LHD>

AC

Junction block (rear view)

C-228 (GR)

Harness side

51

52

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AC310461

Junction block (rear view)

Connector: C-228 <RHD>

AC

Harness side

C-228 (GR)

51

52

53

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55

56

57

58

59

60

61

62

63

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SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-172

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-23, and repair if necessary.

• Check the input and output lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. Retest the system.
Check that the ignition key cylinder illumination lamp 
illuminates/extinguishes normally.

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.

AC310446

Connector: C-23

BB

<LHD>

C-23 (B)

Harness side

AC310456

Connector: C-23

AJ

<RHD>

C-23 (B)

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-173

HEADLAMP AND TAIL LAMP

INSPECTION PROCEDURE H-1: The headlamps do not illuminate when the lighting switch is at "TAIL" 
or "PASSING" position, but illuminate only at low beam when the switch is at "HEAD" position. 
However, the headlamps do not illuminate at high beam.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the headlamps illuminate only at low beam regard-
less of the lighting switch position, the headlamp 
fail-safe function may be activated.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the front-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the 
column switch (column-ECU) and the front-ECU and 
the SWS communication lines are normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• COLUMN ECU

• FRONT ECU

OK: "OK" is displayed for all the items

Q: Is the check result normal?

"OK" is displayed for all the items : 

Go to Step 2.

"NG" is displayed on the "COLUMN ECU" menu. : 

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-30

."

"NG" is displayed on the "FRONT ECU" menu. : 

Refer to Inspection Procedure A-4 
"Communication with the front-ECU is not 
possible 

P.54C-42

."

Step 2. Retest the system.
Check that the headlamps illuminate normally.

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 column switch.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-174

INSPECTION PROCEDURE H-2: The tail lamps do not illuminate normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If all the tail lamps do not illuminate, the tail lamp 
switch input circuit or the front-ECU may be defec-
tive.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the front-ECU

• Damaged harness wires and connectors

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue
W : White     Y : Yellow     SB : Sky blue     BR : Brown
O : Orange     GR : Gray     R : Red     P : Pink     V : Violet

BATTERY

FRONT-ECU

TAIL LAMP
RELAY

RELAY
BOX

INPUT SIGNAL

· HEADLAMP AUTOMATIC
  SHUTDOWN
· TAIL LAMP SWITCH

<LHD>
· HEADLAMP
  ASSEMBLY (LH)
· REAR COMBINATION
  LAMP (LH)
· COMBINATION METER
· LICENCE PLATE LAMP

<RHD>
· HEADLAMP
  ASSEMBLY (LH)
· REAR COMBINATION
  LAMP (LH)
· LICENCE PLATE LAMP

<LHD>
· HEADLAMP
  ASSEMBLY (RH)
· REAR COMBINATION
  LAMP (RH)

<RHD>
· HEADLAMP
  ASSEMBLY (RH)
· REAR COMBINATION
  LAMP (RH)
· COMBINATION METER

Taillamp Relay Circuit