Mitsubishi Lancer Evolution IX. Manual - part 121

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-47

Step 2. Pulse check
Check the input signals below, which are related to 
the lamp reminder buzzer function.

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 driver's door switch signal is not received. : 

Refer to inspection procedure L-3 "The door 
switch (front: LH) signal is not received <LH 
drive vehicles>

P.54B-244

 ." Refer to 

inspection procedure L-3 "The door switch 
(front: RH) signal is not received <RH drive 
vehicles>

P.54B-246

 ."

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

."

The headlamp 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. Retest the system.
The lamp reminder buzzer function should work nor-
mally.

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.

System switch

Check condition

Ignition switch (IG1)

When turned from ACC 
to ON

Driver's door switch

When the driver's door is 
opened

Tail lamp switch

When the lighting switch 
is turned to the TAIL 
position

Headlamp switch

When the lighting switch 
is turned to the 
HEADLAMP position

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-48

CENTRAL DOOR LOCKING SYSTEM

INSPECTION PROCEDURE C-1: Central door locking system does not work. <LH drive vehicles>

CAUTION

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

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

DOOR LOCK
ACTUATOR
(FRONT: LH)

1

FUSIBLE
LINK

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

ETACS-ECU

J/B SIDE

Central Door Lock Power Supply Circuit <LHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-49

COMMENT ON TROUBLE SYMPTOM

If the central door locking system does not work at 
all, the front door lock actuator (LH) or the 
ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the front door lock actuator (LH)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS 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 ETACS-ECU battery power supply 
circuit 

P.54B-42

."

Step 2. Pulse check
Check the input signal from the driver's door lock 
actuator switch.

OK: The M.U.T.-II/III sound or the voltmeter 
needle fluctuate.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to inspection procedure L-11 "The 
front door lock actuator (LH) switch signal is 
not received <LH drive vehicles>

P.54B-272

 

."

Step 3. Connector check: E-04 front door lock 
actuator (LH) connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

Step 4. Check the front door lock actuator (LH)
Check that the front door lock actuator (LH) works 
normally. Refer to GROUP 42 

− Door 

P.42-31

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the front door lock actuator (LH).

Step 5. Connector check: C-226 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

System switch

Check condition

Driver's door lock 
actuator switch

When the driver's key 
cylinder or inside lock 
knob is unlocked or 
locked

AC310484

Harness side

AB

Connector: E-04 <LHD>

E-04(B)

Front door (LH)

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-50

Step 6. Check the wiring harness between C-226 
ETACS-ECU connector terminal No.2 and fusible 
link (1).

NOTE: 

Prior to the wiring harness inspection, check interme-
diate connector C-126 and junction block connector 
C-212, and repair if necessary.

• Check the power supply line for open or short cir-

cuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. Retest the system.
Check that the central door locking system works 
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.

AC310450

Connector: C-226 <LHD>

AB

Junction block side

Junction block (rear view)

AC310523AB

Fusible link: No.1

AC310446

Connector: C-126 <LHD>

AD

AC310448

Harness side

Junction block (front view)

Connector: C-212 <LHD>

AF

C-212 (B)