Mitsubishi Lancer Evolution IX. Manual - part 246

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-243

NOTE: 

Prior to the wiring harness inspection, check interme-
diate connector C-127 <LH drive vehicles - rear fog 
lamp>, C-112 <RH drive vehicles - rear fog lamp> 
and junction block connector C-209, and repair if 
necessary.

• Check the 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 rear fog lamp and the rear fog lamp 
indicator lamp illuminate normally.

Q: Is the check result normal?

The lamps illuminate normally at both high and low 
beams. : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction 

P.00-5

).

The rear fog lamps do not illuminate. : 

Replace the 

rear fog lamp(s).

The rear fog lamp indicator lamp does not 
illuminate. : 

Replace the combination meter.

AC310446

Connector: C-127
<LHD>

AN

C-112(GR)

AC310456

Connector: C-112
<RHD>

AM

C-112(GR)

AC310448

Harness side

Junction block (front view)

Connector: C-209

AO

<LHD>

AC310458

Harness side

Junction block (front view)

Connector: C-209

AL

<RHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-244

INTERIOR LAMP

INSPECTION PROCEDURE K--1: The front or rear room lamp does not illuminate or extinguish 
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)

• Key reminder switch

• All of the door switches

• Driver's door lock actuator

• Interior lamp loaded signal

If this function does not work normally, these input 
signal circuit(s), the interior lamp automatic shut-
down function or the ETACS-ECU may be defective. 
The delay-off setting of this function can be changed 
by the adjustment function (default setting; 15 sec-
onds).

POSSIBLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of the door switches

• Malfunction of the driver's door lock actuator

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

J/B SIDE

ETACS-ECU

REAR
ROOM
LAMP

FRONT
ROOM
LAMP

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

LUGGAGE
COMPARTMENT
LAMP SWITCH

LUGGAGE
COMPARTMENT
LAMP

Room Lamp Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-245

DIAGNOSIS PROCEDURE

Step 1. Check the adjustment function.
Check that the room lamp delay-off time has been 
set to other than "0 second" by the adjustment func-
tion.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Use the adjustment function to set the room 
lamp delay-off time to other than "0 second" 
(Refer to GROUP 54B 

− Adjustment 

function 

P.54B-302

).

Step 2. ECU check by using the SWS monitor.
Check that the power supply and earth lines to the 
ETACS-ECU and the SWS communication lines are 
normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• ETACS ECU

OK: "OK" is displayed on the "ETACS ECU" 
menu.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Refer to Inspection Procedure A-3 
"Communication with the ETACS-ECU is 
not possible 

P.54C-36

."

Step 3. SWS monitor data list.
Check the input signals below, which are related to 
the front and rear dome lamps.

<Selected item> ETACS ECU

• Ignition switch: OFF

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

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

P.54C-261

."

Step 4. Pulse check
Check the input signals below, which are related to 
the front or rear dome lamps.

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 

5.

The key reminder switch signal is not received. : 

Refer to Inspection Procedure L-9 "The key 
reminder switch signal is not received 

P.54C-281

."

All the door switch signals are not received. : 

Refer to Inspection Procedure L-11 "All the 
door switch signals are not received <LH 
drive vehicles>

P.54C-289

 ," or refer to 

Inspection Procedure L-11 "All the door 
switch signals are not received <RH drive 
vehicles>

P.54C-292

 ."

The driver's door lock actuator switch signal is not 
received. : 

Refer to Inspection Procedure L-12 

"The front door lock actuator (LH) switch 
signal is not received <LH drive 
vehicles>

P.54C-296

 ," or refer to Inspection 

Procedure L-12 "The front door lock 
actuator (RH) switch signal is not received 
<RH drive vehicles>

P.54C-299

 ."

The interior lamp loaded signal is not received. : 

Refer to Inspection Procedure L-15 "The 
interior lamp loaded signal is not detected 

P.54C-307

."

Step 5. Determine a trouble spot.

Q: Which lamp does not illuminate?

No lamp illuminates. : 

Replace the ETACS-ECU.

The front room lamp or the rear room lamp does 
not illuminate. : 

Go to Step 6.

The luggage compartment lamp does not 
illuminate. : 

Go to Step 11.

Item No.

Item name

Normal 
condition

Item 30

IG SW(IG1)

OFF

System switch

Check condition

Key reminder switch When the inserted ignition 

key is pulled out

All of the door 
switches

A door is opened when all 
the doors are closed

Driver's door lock 
actuator switch

When the driver's door is 
unlocked or locked

Interior lamp loaded 
signal

When a load is applied 
through multi-purpose fuse 
No.18

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-246

Step 6. Connector check: D-05 front room lamp 
connector, D-07 rear room lamp connector

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the defective connector.

Step 7. Check the bulbs of the front or rear room 
lamps.
Check that the front or rear room lamp bulbs are not 
burned out.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Replace the front or rear room lamp bulb.

Step 8. Connector check: C-226 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the defective connector.

AC310464

Harness side

D-05

D-05

AB

Connectors: D-05, D-07

Harness side

D-07

<LHD>

D-07
(GR)

AC310472

Harness side

D-05

D-05

AB

Connectors: D-05, D-07

Harness side

D-07

<RHD>

D-07
(GR)

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side