Mitsubishi Grandis. Manual - part 223

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-354

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the rear fog lamp switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the tail/stop lamps and 
headlamps operate.

Check that the tail/stop lamps and headlamps 
illuminate normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Check the tail/stop lamps and the 
headlamps (Refer to trouble symptom chart 

P.54C-44

).

Step 2. ECU check by using the SWS monitor

Check that the power supply and earth lines to the 
column switch (column-ECU) and the ETACS-ECU 
and the SWS communication lines are normal.

• Ignition switch: OFF

ECUS TO BE CHECKED

• COLUMN ECU

• ETACS ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

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

FUSIBLE
LINK

REAR FOG
LAMP

REAR 
FOG 
LAMP 
RELAY

30

Rear Fog Lamp Circuit <RHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-355

"OK" are displayed for all the items : 

Go to Step 3.

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

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-56

."

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

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

P.54C-63

."

Step 3. Function diagnosis by using the SWS 
monitor

Check the SWS communication signal, which are 
related to the fog lamps.

<Selected item> LIGHTING - REAR FOG LAMP

• Ignition switch: ON

• Lighting switch: "TAIL" or "HEAD"

• Rear fog lamp switch: ON

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

Normal conditions are displayed for all the items. : 

Go to Step 4.

Normal condition is not displayed for item 00 or 01. 
: 

Refer to inspection procedure Q-6 "The 
column switch (Lighting and turn-signal 
lamp and headlamp washer switch) signal is 
not received 

P.54C-478

."

Step 4. ETACS switch data by using the SWS 
monitor

Check the input signals below, which are related to 
the rear fog lamp.

• Rear fog lamp switch: from OFF to ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Refer to inspection procedure Q-13 "The 
rear fog lamp switch signal is not received 

P.54C-501

."

Step 5. Connector check: G-23 rear fog lamp 
connector <LH drive vehicles> or G-11 rear fog 
lamp connector <RH drive vehicles>

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

Step 6. Check the bulbs of the rear fog lamps.

Check the bulb(s) of the defective lamp.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the bulb(s) of the defective lamp.

Item No. Item name

Normal condition

Item 00

HEADLAMP SW

ON when the 
lighting switch is at 
HEAD

Item 01

TAIL LAMP SW

ON when the 
lighting switch is at 
TAIL

Item No. Item name

Normal conditions

Item 11

R.FOG LAMP SW OFF to ON (only 

when switch is 
operated)

AC310220

Connector: G-23

AE

G-23 (GR)

Harness side

AC310222

Connector: G-11

AE

G-11 (GR)

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-356

Step 7. Resistance measurement at the G-23 rear 
fog lamp connector <LH drive vehicles> or G-11 
rear fog lamp connector <RH drive vehicles>.

(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Check the resistance between the lamp 

connector and body earth.

•

Resistance between G-23 rear fog lamp relay 

connector <LH drive vehicles> or G-11 rear 
fog lamp relay connector <RH drive vehicles> 
connector terminal No.1 and body earth

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Go to Step 8.

Step 8. Check the wiring harness from G-23 rear 
fog lamp connector <LH drive vehicles> or G-11 
rear fog lamp connector <RH drive vehicles> 
terminal No.1 to body earth.

• Check the earth wires 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.

AC310220

Connector: G-23

AE

G-23 (GR)

Harness side

AC310222

Connector: G-11

AE

G-11 (GR)

Harness side

AC310506BK

Connector 
G-23 <L.H. drive vehicles> or 
G-11 <R.H. drive vehicles> 
(Harness side)

AC310220

Connector: G-23

AE

G-23 (GR)

Harness side

AC310222

Connector: G-11

AE

G-11 (GR)

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-357

Step 9. Connector check: C-213 rear fog lamp 
relay connector

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Repair the defective connector.

Step 10. Check the rear fog lamp relay.

Refer to GROUP 54A 

− Rear fog lamp 

P.54A-94

.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Replace the rear fog lamp relay.

Step 11. Voltage measurement at the C-213 rear 
fog lamp relay connector.

(1) Remove the rear fog lamp relay, and measure at 

the relay box side.

(2) Check the voltage between the rear fog lamp 

relay connector and body earth.

• Voltage between C-213 rear fog lamp relay 

connector terminal No.3 and body earth

• Voltage between C-213 rear fog lamp relay 

connector terminal No.4 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 13.

NO : 

Go to Step 12.

AC310623

Connector: C-213 <LHD>

AP

Junction block side

Junction block (Front view)

AC310618

Connector: C-213 <RHD>

AN

Junction block side

Junction block (Front view)

AC310623

Connector: C-213 <LHD>

AP

Junction block side

Junction block (Front view)

AC310618

Connector: C-213 <RHD>

AN

Junction block side

Junction block (Front view)

AC310507BU

Connector C-213 
(Relay box side)