Mitsubishi Grandis. Manual - part 92

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-365

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU activates the interior lamps (room 
lamp, rear personal lamp, luggage compartment 
lamp, door lamps, key cylinder illumination lamp) 
according to the input signals below.

• Ignition switch (IG1)

• Door switches

• Tailgate switch

• Door key switch

• Tailgate key switch

• Driver's door lock actuator

• Interior lamp switch

• Multi-purpose fuse No.18

• Key reminder switch <vehicles with keyless entry 

system>

• Interior lamp loaded signal <vehicles with keyless 

entry system>

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be 
defective.

POSSIBLE CAUSES

• Malfunction of the door switches

• Malfunction of the room lamp switches

• Malfunction of the driver's door lock actuator

• Malfunction of the ETACS-ECU

• Malfunction of the key reminder switch

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check the power supply circuit.
When the ignition switch is turned to the LOCK 
(OFF) position, check if the hazard warning lamps 
illuminate.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure A-2 "Check 
the ETACS-ECU battery power supply 
circuit 

P.54B-87

."

Step 2. Check the illumination of the interior 
lamps.
Check that the interior lamps illuminate and 
extinguish.
NOTE: Check that the interior lamps illuminate or 
extinguish when the interior lamp switches are 
operated. For the room lamp and the rear personal 
lamps, check they illuminate when the lamp switches 
are turned to the ON or DOOR position.

Q: Which of the interior lamp does no illuminate or 

extinguish?
All of the interior lamps illuminate and extinguish 
normally. : 

The procedure is complete.

No lamps illuminate at all. : 

Replace the 

ETACS-ECU.

When the interior lamp switches are turned to the 
ON position, no lamps illuminate at all. 

KEY CYLINDER
ILLUMINATION
LAMP

· ROOM LAMP

· DOOR LAMP 
· LUGGAGE
  COMPARTMENT
  LAMP

· REAR PERSONAL
  LAMP

J/B SIDE

ETACS-ECU

FUSIBLE
LINK

26

Interior Lamp Circuit <without keyless entry system>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-366

Alternatively, when the interior lamp switches are 
turned to the OFF position, all the interior lamps 
illuminate. : 

Refer to inspection procedure Q-22 

"The interior lamp "all on" or "all off" switch 
signal is not sent to the ETACS-ECU 

P.54B-514

."

If the interior lamp switches are turned to the ON 
position, none of the room lamp and the rear 
personal lamps illuminate at all. : 

Go to Step 3.

The room lamp and the rear personal lamps do not 
illuminate or extinguish normally when the 
switches are at the DOOR position. : 

Go to Step 5.

Only the room lamp does not illuminate or 
extinguish normally. : 

Refer to inspection 

procedure Q-22 "The interior lamp "all on" 
or "all off" switch signal is not sent to the 
ETACS-ECU 

P.54B-514

."

Only right or left rear personal lamp does not 
illuminate or extinguish normally. : 

Refer to 

inspection procedure Q-22 "The interior 
lamp "all on" or "all off" switch signal is not 
sent to the ETACS-ECU 

P.54B-514

."

Only the luggage compartment lamp does not 
illuminate or extinguish normally. : 

Refer to 

inspection procedure Q-22 "The interior 
lamp "all on" or "all off" switch signal is not 
sent to the ETACS-ECU 

P.54B-514

."

Only the door lamps do not illuminate or 
extinguish normally. : 

Refer to inspection 

procedure Q-22 "The interior lamp "all on" 
or "all off" switch signal is not sent to the 
ETACS-ECU 

P.54B-514

."

Only the key cylinder illumination lamp does not 
illuminate or extinguish normally. : 

Refer to 

inspection procedure Q-22 "The interior 
lamp "all on" or "all off" switch signal is not 
sent to the ETACS-ECU 

P.54B-514

."

Step 3. Connector check: C-219 ETACS-ECU 
connector and E-02 room lamp connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

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

AC310651

AD

Connector: E-02 <LHD>             

Harness side

AC310655

AE

Connector: E-02 <RHD>             

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-367

Step 4. Check the wiring harness from C-219 
ETACS-ECU connector terminal No.6 to E-02 
room lamp connector terminal No.10.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-368

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector E-11 and junction block 
connector C-211, and repair if necessary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

Replace the ETACS-ECU.

NO : 

Repair the wiring harness.

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

AC310652

AB

Connectors: E-02, E-11

Harness side

E-02

E-11

E-02

E-11

<Vehicles with 
sunroof-LHD>

AC310656

AB

Connectors: E-02, E-11

Harness side

E-02

E-11

E-02

E-11

<Vehicles with 
sunroof-RHD>

AC310623

AC310623

Connector: C-211

AQ

<LHD>

Junction block (Front view)

Harness side

3

1

2

AC310618

AC310618

Connector: C-211 <RHD>

AS

Harness side

Junction block (Front view)

3

1

2