Mitsubishi Grandis. Manual - part 260

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-502

COMMENTS ON TROUBLE SYMPTOM

Input signal from the rear fog lamp switch is used to 
operate the rear fog lamps. If the signal is abnormal, 
the rear fog lamps will not illuminate and extinguish 
normally.

POSSIBLE CAUSES

• Malfunction of the fog lamp switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Connector check: C-130 fog lamp switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

Step 2. Check the rear fog lamp switch.

Refer to GROUP 54A 

− Rear fog lamp 

P.54A-94

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the fog lamp switch.

Step 3. Resistance measurement at the C-130 fog 
lamp switch connector.

(1) Remove the fog lamp switch, and measure at the 

wiring harness side.

(2) Continuity between C-130 fog lamp switch 

connector terminal No.6 and body earth

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

AC312031

AF

1

5

6

4 3 2

Connector: C-130 <LHD>

Harness side

AC312043AF

1

5

6

4 3 2

Connector: C-130 <RHD>

Harness side

AC312031

AF

1

5

6

4 3 2

Connector: C-130 <LHD>

Harness side

AC312043AF

1

5

6

4 3 2

Connector: C-130 <RHD>

Harness side

AC312730AJ

Connector C-130
(Harness side)

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-503

Step 4. Check the wiring harness between C-130 
fog lamp switch connector terminal No.6 and 
body earth.

NOTE: 

Prior to the wiring harness inspection, check joint 
connector C-31 <RH drive vehicles>, and repair if 
necessary.

• 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.

Step 5. Connector check: C-220 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

AC312031

AF

1

5

6

4 3 2

Connector: C-130 <LHD>

Harness side

AC312043AF

1

5

6

4 3 2

Connector: C-130 <RHD>

Harness side

AC312043AE

Connector: C-31 <RHD>

AC312037

Connector: C-220

Junction block (Rear view)

AC

<LHD>

Harness side

AC312047

Connector: C-220

Junction block (Rear view)

AC

<RHD>

Harness side

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-504

Step 6. Check the wiring harness between C-220 
ETACS-ECU connector terminal No.21 and C-130 
fog lamp switch connector terminal No.5.

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

Step 7. ETACS switch data by using the SWS 
monitor

Check the input signal from the rear fog lamp switch.

• Rear fog lamp switch: from OFF to ON

OK: Normal condition is displayed.

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.

AC312037

Connector: C-220

Junction block (Rear view)

AC

<LHD>

Harness side

AC312047

Connector: C-220

Junction block (Rear view)

AC

<RHD>

Harness side

AC312031

AF

1

5

6

4 3 2

Connector: C-130 <LHD>

Harness side

AC312043AF

1

5

6

4 3 2

Connector: C-130 <RHD>

Harness side

Item No. Item name

Normal 
conditions

Item 11

R.FOG LAMP SW

OFF to ON (only 
when switch is 
operated)

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-505

Inspection Procedure Q-14: All the door switch signals are not received.

CAUTION

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

Door Switches Input Circuit <LHD>

DOOR 
SWITCH 
(FRONT: RH)

DOOR 
SWITCH 
(REAR: RH)

DOOR 
SWITCH 
(FRONT: LH)

DOOR 
SWITCH 
(REAR: LH)

ETACS-ECU

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

J/B SIDE

TAILGATE
SWITCH