Mitsubishi Grandis. Manual - part 94

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-373

COMMENTS ON TROUBLE SYMPTOM

If the room lamp does not illuminate or extinguish 
normally, wiring harness connector(s) or the bulb 
may be defective.

POSSIBLE CAUSES

• Malfunction of the interior lamp switches

• Malfunction of the room lamp bulbs

• Malfunction of the rear personal lamp bulbs

• Damaged harness wires and connectors

ETACS-ECU

J/B SIDE

ROOM LAMP

INTERIOR
LAMP
SWITCH

REAR
PERSONAL
LAMP

FOR
SECOND
SEAT: LH

REAR
PERSONAL
LAMP

FOR
SECOND
SEAT: RH

REAR
PERSONAL
LAMP

FOR
THIRD
SEAT: LH

REAR PERSONAL LAMP
(FOR THIRD SEAT: RH)

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

Room Lamp and Rear Personal Lamp Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-374

DIAGNOSTIC PROCEDURE

Step 1. Pulse check
Check the input signals below, which are related to 
the room lamp.

OK: The MUT-III sounds or the voltmeter 
needle fluctuates.

Q: Is the check result normal?

All the signals are received normally. : 

Go to Step 

2.

All the door switch signals are not received. : 

Refer to inspection procedure Q-14 "All the 
door switch signals are not received <LH 
drive vehicles>

P.54B-469

 or <RH drive 

vehicles>

P.54B-469

."

The driver's door lock actuator switch signal is not 
received. : 

Refer to inspection procedure Q-15 

"The driver's door lock actuator switch 
signal is not received <LH drive 
vehicles>

P.54B-478

 or <RH drive 

vehicles>

P.54B-481

."

The interior lamp switch signal is not received. : 

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 2. Retest the system.
Check that the right or left room lamp illuminates 
when the interior lamp switch is operated.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 3.

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

Q: Is the check result normal?

System switch

Check condition

Driver's door switch

Driver's door is opened 
while all the other doors 
are closed.

Passenger’s door switch Passenger's door is 

opened while all the 
other doors are closed.

Rear door (RH) switch

Rear door (RH) is 
opened while all the 
other doors are closed

Rear door (LH) switch

Rear door (LH) door is 
opened while all the 
other doors are closed

Tailgate switch

TAilgate is opened while 
all the other doors are 
closed

Driver's door lock 
actuator switch

When the driver's door is 
unlocked or locked

Interior lamp ON switch

When turned from OFF 
to ON

Interior lamp OFF switch When turned from ON to 

OFF

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-375

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-376

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