Mitsubishi Lancer Evolution IX. Manual - part 149

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-159

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 <LHD>

AY

C-23 (B)

AC310456

Connector: C-23

AJ

<RHD>

C-23 (B)

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-160

HEADLAMP AND TAIL LAMP

INSPECTION PROCEDURE H-1: 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

DIAGNOSTIC PROCEDURE

Step 1. M.U.T.-II/III diagnosis code.
When the ignition switch is turned to the LOCK 
(OFF) position, check that the ETACS-ECU does not 
set the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Refer to diagnosis code chart 

P.54B-14

.

NO : 

Go to Step 2.

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

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-161

Step 2. Pulse check
Check the input signal from the tail lamp switch.

OK: The M.U.T.-II/III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

All the signals are received normally. : 

Go to Step 

3.

The ignition switch (IG1) signal is not received. : 

Refer to inspection procedure L-2 "The 
ignition switch (IG1) signal is not received 

P.54B-242

."

The tail lamp switch signal is not received. : 

Refer 

to inspection procedure L-4 "The column 
switch (lighting and turn-signal lamp switch) 
signal is not received 

P.54B-248

."

Step 3. Connector check: A-10X front-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

Step 4. Voltage measurement at A-10X front-ECU 
connector

(1) Remove the front-ECU, and measure at the relay 

box side.

(2) Voltage between A-10X front-ECU connector 

terminal No.5 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

Step 5. Check the wiring harness between A-10X 
front-ECU connector terminal No.5 and the 
battery.

• 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.

System switch

Check condition

Ignition switch (IG1)

When turned from ACC 
to ON

Tail lamp switch

When the lighting switch 
is turned to the TAIL 
position

AC310572AB

Connector: A-10X

Relay box side

10

11

5

9 8 7 6

4 3

1

2

Battery

AC310572AB

Connector: A-10X

Relay box side

10

11

5

9 8 7 6

4 3

1

2

Battery

AC301541 DB

Connector A-10X
(Relay box side)

5

11

9

10

8 7 6

2

4 3

1

AC310572AB

Connector: A-10X

Relay box side

10

11

5

9 8 7 6

4 3

1

2

Battery

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-162

Step 6. Retest the system.
Check that the tail lamps 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 front-ECU.

INSPECTION PROCEDURE H-2: The low-beam headlamps 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 the low-beam headlamps do not illuminate, the 
headlamp switch input circuit or the front-ECU may 
be defective.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the front-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. M.U.T.-II/III diagnosis code.
When the ignition switch is turned to the LOCK 
(OFF) position, check that the ETACS-ECU does not 
set the diagnosis code.

Q: Is the diagnosis code set?

YES : 

Refer to diagnosis code chart 

P.54B-14

.

NO : 

Go to Step 2.

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

HEADLAMP
RELAY: LO

RELAY
BOX

INPUT SIGNAL

· HEADLAMP AUTOMATIC
  SHUTDOWN
· TAIL LAMP SWITCH

HEADLAMP
ASSEMBLY (LH)

HEADLAMP
ASSEMBLY (RH)

Headlamp Relay (Low-Beam) Circuit