Mitsubishi Grandis. Manual - part 96

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-381

Inspection Procedure P-3: The rear personal lamp does not illuminate normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
input and output signal circuits are normal.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-382

COMMENTS ON TROUBLE SYMPTOM

If the rear personal lamps do 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-383

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 

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 which lamp does not illuminate when the lamp 
switches are operated.

Q: Which lamp does not illuminate?

No lamps illuminate : 

Go to Step 3.

One of the second seat lamps (RH or LH) or the 
third seat lamps (RH or LH) does not illuminate. : 

Go to Step 7.

Step 3. Check the rear personal lamp switches.
Check which position (ON or DOOR) of the rear 
personal lamp switch does not activate the relevant 
lamp.

Q: Which switch position does not activate the lamp?

The lamp illuminates at neither the ON nor DOOR 
position.  : 

Go to Step 4.

The lamp does not illuminate at the DOOR position. 
: 

Go to Step 6.

The lamp does not illuminate at the ON position. : 

Replace the rear personal lamp.

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

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-384

Step 4. Connector check: C-219 ETACS-ECU 
connector, E-09 rear personal lamp connector

Q: Is the check result normal?

YES : 

Go to Step 5.

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

AC310651

AG

Connector: E-09 <LHD>             

Harness side

AC310655

AC310655

AH

Connector: E-09 <RHD>             

Harness side