Mitsubishi Lancer Evolution IX. Manual - part 170

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-243

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

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

junction block side.

(2) Ignition switch: ON position

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

terminal No.8 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

Step 3. Check the wiring harness between C-226 
ETACS-ECU connector terminal No.8 and the 
ignition switch (IG1).

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector C-211, and repair if necessary.

• Check the power supply line for open circuit.

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

AC301541GU

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

AB

Junction block side

Junction block (rear view)

<LHD>

AC310461

Junction block (rear view)

Connector: C-226

AB

<RHD>

Junction block side

AC310448

Harness side

Junction block (front view)

Connector: C-211

AB

<LHD>

4

6 5

3

2

1

AC310458

Harness side

Junction block (front view)

Connector: C-211

AB

<RHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-244

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 4. Retest the system.
Check that the ignition switch (IG1) signal is received 
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.

INSPECTION PROCEDURE L-3: The door switch (front: LH) signal is not received. <LH drive 
vehicles>

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the door switch (front: LH) is used 
to operate the functions below. If the signal is abnor-
mal, these functions will not work normally.

• Lamp reminder function

• Headlamp automatic shutdown function

• Room lamps

POSSIBLE CAUSES

• Malfunction of the door switch (front: LH)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the installation condition.
Check that the door switch (front: LH) is installed on 
the body correctly.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Correct the installation condition.

J/B SIDE

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

FRONT DOOR
SWITCH (LH) 

Door Switch Input Circuit <LHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-245

Step 2. Connector check: D-18 door switch (front: 
LH) connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Check the door switch (front: LH).
Refer to GROUP 42 

− Door 

P.42-27

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the door switch (front: LH).

Step 4. Connector check: C-226 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

Step 5. Check the wiring harness between D-18 
door switch (front: LH) connector terminal No.3 
and C-226 ETACS-ECU connector terminal No.10.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-217, and repair if necessary.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

Step 6. Retest the system.
Check that the door switch (front: LH) signal is 
received 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.

AC310465

Harness side

AB

Connector: D-18
<LHD>

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310450

Connector: C-226

AB

Junction block side

Junction block (rear view)

<LHD>

AC310465

Harness side

AB

Connector: D-18
<LHD>

AC310448

Harness side

Junction block (front view)

Connector: C-217

AC

<LHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-246

INSPECTION PROCEDURE L-3: The door switch (front: RH) signal is not received. <RH drive 
vehicles>

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

Input signal from the door switch (front: RH) is used 
to operate the functions below. If the signal is abnor-
mal, these functions will not work normally.

• Lamp reminder function

• Headlamp automatic shutdown function

• Room lamps

POSSIBLE CAUSES

• Malfunction of the door switch (front: RH)

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the installation condition.
Check that the door switch (front: RH) is installed on 
the body correctly.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Correct the installation condition.

Step 2. Connector check: D-01 door switch (front: 
RH) connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Check the door switch (front: RH).
Refer to GROUP 42 

− Door 

P.42-27

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the door switch (front: RH).

J/B SIDE

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

DOOR SWITCH
(RH) 

Door Switch Input Circuit <RHD>

AC310471

Harness side

AB

Connector: D-01
<RHD>