Mitsubishi Grandis. Manual — part 228

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-374

ROOM LAMP

Inspection Procedure P-1: The interior lamps (room ramp, rear personal lamps, door lamps, luggage
compartment lamp, key illumination lamp) does not illuminate or extinguish normally.

CAUTION

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

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) USING SWS MONITOR

54C-375

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. Customize function by using the SWS
monitor

Use the SWS monitor customisation function to
confirm that "RM LMP TN OFF" is set to other than
"0 second" (one of the settings below).

• 30 seconds

• 15 seconds

• 7.5 seconds

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Use the SWS monitor customisation
function to confirm that "RM LMP TN OFF"
is set to other than "0 second" (Refer to

P.54C-574

).

KEY CYLINDER
ILLUMINATION
LAMP

· ROOM LAMP

· DOOR LAMP
· LUGGAGE
COMPARTMENT
LAMP

· REAR PERSONAL
LAMP

KEEP RELAY

LOAD
DETERMINATION
CIRCUIT

J/B SIDE

ETACS-ECU

FUSIBLE
LINK

26

Interior Lamp Circuit <with keyless entry system>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-376

Step 2. ECU check by using the SWS monitor

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

• Ignition switch: OFF

ECUS TO BE CHECKED

• ETACS ECU

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

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

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

P.54C-63

."

Step 3. 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.
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.54C-553

."

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 4.

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 6.

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.54C-553

."

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.54C-553

."

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.54C-553

."

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.54C-553

."

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.54C-553

."

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-377

Step 4. Connector check: C-219 ETACS-ECU
connector and E-02 room 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

AD

Connector: E-02 <LHD>

Harness side

AC310655

AE

Connector: E-02 <RHD>

Harness side