Mitsubishi Grandis. Manual - part 150

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-62

Step 8. Check the wiring harness from C-221 
ETACS-ECU connector terminal Nos.59 and 68 to 
C-301 column switch connector terminal Nos.3 
and 2.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-01, and repair if necessary.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

Step 9. ECU check by using the SWS monitor

• Ignition switch: OFF

ECUS TO BE CHECKED

• COLUMN ECU

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

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the column switch.

Step 10. Retest the system.

Check that the ETACS-ECU communicates with the 
column switch.

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.

AC310626

Connector: C-221

Junction block (Rear view)

<LHD>

AC

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Harness side

C-221(GR)

AC310620

Connector: C-221

Junction block 
(Rear view)

<RHD>

AC

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Harness side

C-221(GR)

AC310153AB

Connector: C-301 <LHD>

Harness side

AC310183

AB

Connector: C-301 <RHD>

Harness side

AC310613

AE

Connector: C-01 <LHD>

AC310631AE

Connector: C-01 <RHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-63

Inspection Procedure A-3: Communication with the ETACS-ECU is not possible.

CAUTION

Whenever the ECU is replaced, ensure that the 
power supply circuit, the earthing circuit and the 
communication circuit are normal.

ETACS-ECU Power Supply and SWS Communication Circuit <LHD>

FUSIBLE 
LINK

IGNITION 
SWITCH (IG1)

POWER 
SOURCE

ETACS-
ECU

COLUMN-ECU

COLUMN 
SWITCH

DIAGNOSIS 
CONNECTOR

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

FRONT SIDE

26

REALAY
BOX

J/B SIDE

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-64

ETACS-ECU Power Supply and SWS Communication Circuit <RHD>

FUSIBLE 
LINK

IGNITION 
SWITCH (IG1)

POWER 
SOURCE

ETACS-
ECU

COLUMN-ECU

COLUMN 
SWITCH

DIAGNOSIS 
CONNECTOR

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

FRONT SIDE

26

REALAY
BOX

J/B SIDE

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-65

COMMENTS ON TROUBLE SYMPTOM

It is suspected that the power supply circuit to the 
ETACS-ECU is defective, or the wiring harness 
between the SWS monitor and the ETACS-ECU or 
their connector(s) is damaged. If the battery power 
supply circuit to the ECU (terminal No.20 of the 
ETACS-ECU) is damaged, also check the power 
supply circuit from the ignition switch (IG1) (terminal 
No.8 of the ETACS-ECU), and repair if necessary. If 
the earth circuit to the ECU (terminal No.3 of the 
ETACS-ECU) is defective, also check the earth 
circuit to the sensor (terminal No.56 of the 
ETACS-ECU), and repair if necessary.

TROUBLESHOOTING HINTS

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: C-219 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Step 2. Voltage measurement at the C-219 
ETACS-ECU connector.

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

junction block side.

(2) Voltage between C-219 ETACS-ECU connector 

terminal No.20 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310626

Connector: C-219

Junction block (Rear view)

<LHD>

AB

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310507BP

Connector C-219
(Junction block side)

2019

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