Mitsubishi Grandis. Manual - part 247

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-450

<RH drive vehicles> Prior to the wiring harness 
inspection, check intermediate connector C-14 <door 
switch (front: RH)>, C-16 <door switch (front: RH) 
and door switch (front: LH)>, C-27 <door switch 
(front: LH)>, D-03 <door switch (rear: RH)>, D-16 
<door switch (rear: LH)>, junction block connector 
C-210, and repair if necessary.

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.

AC310632 AR

Connectors: C-14, C-16

C-14

C-16

C-14

C-16

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

29

1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

<RHD>

AC310628AN

Connector: C-27 <RHD>

AC310618

Connector: C-210 <RHD>

AQ

Harness side

Junction block (Front view)

AC310205

AC

D-03 (B)

9

3

2

1
5 6 7 8

4

10

Connector: D-03 <RHD>

AC310207

AC310207

AF

9

3

2

1
5 6 7 8

4

10

Connector: D-16 <RHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-451

Inspection Procedure P-6: Interior lamp automatic shutoff function does not work normally. <Vehicles 
with keyless entry system>

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU operates the interior lamp 
automatic-shutdown function in accordance with the 
input signals below.

• Ignition switch (ACC)

• Ignition switch (IG1)

• Driver's door switch

• Tailgate switch

• All of the door switches

• Interior lamp loaded signal

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be 
defective. Note that this function can be 
disabled/enabled by the adjustment function (default 
setting; enabled).

POSSIBLE CAUSES

• Malfunction of the door switches

• Malfunction of the tailgate switch

• Malfunction of the interior lamp

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the SWS monitor customized 
function.

Check that the interior lamp automatic-shutdown 
function has been enabled by using the SWS monitor 
customize function.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Enable the interior lamp 
automatic-shutdown function by using the 
SWS monitor customize function (Refer to 

P.54C-574

).

INPUT SIGNAL

KEY CYLINDER
ILLUMINATION
LAMP

· ROOM LAMP

· DOOR LAMP AND
  LUGGAGE
  COMPARTMENT
  LAMP

· REAR PERSONAL
  LAMP

KEEP RELAY

LOAD
DETERMINATION
CIRCUIT

J/B SIDE

· ALL DOOR
  SWITCH
· FRONT DOOR
  SWITCH
· IGNITION
  SWITCH (ACC)
· IGNITION
  SWITCH (IG1)
· INTERIOR LAMP
  LOADED SIGNAL

ETACS-ECU

FUSIBLE
LINK

26

Interior Lamp Automatic Shut-off Function Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-452

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

ECU TO BE CHECKED

• ETACS

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 
impossible 

P.54C-63

."

Step 3. SWS monitor data list.

Check the input signals below, which are related to 
the interior lamp automatic-shutdown function.

<Selected item> ETACS ECU

• Ignition switch: OFF

• Driver's door: open

OK: Normal condition is displayed.

Q: Is the check result normal?

Normal conditions are displayed for all the items. : 

Go to Step 4.

Normal condition is not displayed for item No.30. : 

Refer to inspection procedure Q-2 "The 
ignition switch (IG1) signal is not received 

P.54C-460

."

Normal condition is not displayed for item No.31. : 

Refer to inspection procedure Q-1 "The 
ignition switch (ACC) signal is not received 

P.54C-456

."

Normal condition is not displayed for item No.32. : 

Refer to inspection procedure Q-5 "The 
driver's door switch signal is not received 

P.54C-474

 <LH drive vehicles> or 

P.54C-476

 <RH drive vehicles."

Step 4. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU signal related to the interior 
lamp automatic shut-down function.

• Passenger’s door: Close → Open

• Tailgate: Close → Open

• Rear door (RH): Close → Open

• Rear door (LH): Close → Open

OK: Normal conditions displayed for all the 
items.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Refer to inspection procedure Q-14 "All the 
door switch signals are not received 

P.54C-505

."

Step 5. Pulse check

Check the input signals below, which are related to 
the interior lamp automatic-shutdown function.

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

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Refer to inspection procedure Q-24 "Interior 
lamp loaded signal is not detected 

P.54C-563

."

Item No.

Item name

Normal 
condition

Item 30

IG SW(IG1)

OFF

Item 31

IG SW(ACC)

OFF

Item 32

DR DOOR SW

ON

Item No.

Item name

Normal 
condition

Item 05

PASS DOOR SW

from OFF 
to ON

Item No.

Item name

Normal 
condition

Item 07

TRK LID LA SW

from OFF 
to ON

Item No.

Item name

Normal 
condition

Item 41

R.DOOR(RH) SW

from OFF 
to ON

Item No.

Item name

Normal 
condition

Item 42

R.DOOR(LH) SW

from OFF 
to ON

System switch

Check condition

Interior lamp loaded 
signal

When a load is applied 
through multi-purpose 
fuse No.18

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-453

Step 6. Retest the system.

Check that the interior lamp automatic-shutdown 
function works normally.

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.

Inspection Procedure P-7: The door-ajar warning lamp does not illuminate/extinguish normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the door-ajar warning lamp does not work normally, 
the input signal circuit or the ETACS-ECU may be 
defective.

POSSIBLE CAUSES

• The combination meter may be defective

• The CAN bus line is defective.

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the door lamp.

When the door is opened or closed, check that the 
door lamp illuminate/go off normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure P-5 "The 
door lamp does not illuminate normally 

P.54C-438

."

Step 2. MUT-III CAN bus diagnostics.

Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D, Diagnosis 

P.54D-16

).

Step 3. Check for combination meter diagnosis 
code.

Check whether the combination meter-related 
diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter (Refer to 

GROUP 54A 

− Troubleshooting 

P.54A-35

).

NO : 

Go to Step 4.

ETACS-
ECU

SPEED SIGNAL

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

INPUT SIGNAL

· IGNITION SWITCH (IG1)
· ALL DOOR SWITCH
· TAILGATE SWITCH

Door-Ajar Warning Lamp Function