Mitsubishi Grandis. Manual - part 241

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-426

Inspection Procedure P-4: The luggage compartment lamp does not illuminate 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

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

POSSIBLE CAUSES

• Malfunction of the luggage compartment lamp 

bulbs

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. SWS monitor data list
<Selected item> ETACS ECU

• Driver's door is open

OK: Normal condition is displayed.

Q: Is the check result normal?

Luggage Room Lamp Circuit

ETACS-ECU

LUGGAGE COMPARTMENT 
LAMP

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

J/B SIDE

Item No.

Item name

Normal 
condition

Item 32

DR DOOR SW

ON

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-427

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure Q-5 "The 
driver's door switch signal is not received 
<LH drive vehicles>

P.54C-474

 or <RH drive 

vehicles>

P.54C-476

."

Step 2. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU signal related to the rear 
personal lamp illumination.

• Ignition switch: OFF (key inserted)

• Passenger’s door: Close → Open

• Tailgate: Close → Open

• Rear door (RH): Close → Open

• Rear door (LH): Close → Open

• Driver’s door: Unlock → Lock

• Room lamp on switch: ON

• Room lamp off switch: ON

OK: Normal conditions displayed for all the 
items.

Q: Is the check result normal?

Item No.

Item name

Normal 
condition

Item 03

KEY REMINSW

OFF

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

Item No.

Item name

Normal 
condition

Item 21

DR DOR LOK SW

from OFF 
to ON

Item 22

DR DOR ULOK SW

from ON 
to OFF

Item No.

Item name

Normal 
condition

Item 31

RM LMP ON SW

ON

Item No.

Item name

Normal 
condition

Item 31

RM LMP OFF SW

ON

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-428

Normal conditions are displayed for all the items. : 

Go to Step 3.

Normal condition is not displayed for item No.03 : 

Refer to inspection procedure Q-11 "The 
key reminder switch signal is not received 

P.54C-493

."

Normal condition is not displayed for item No.05, 
07,41or 42 : 

Refer to inspection procedure Q-14 

"All the door switch signals are not received 

P.54C-505

."

Normal condition is not displayed for item No.21 
and 32 : 

Refer to inspection procedure Q-15 "The 

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

P.54C-514

 

or <RH drive vehicles>

P.54C-518

."

Normal condition is not displayed for item No.31or 
42 : 

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

."

Step 3. Connector check: G-12 luggage 
compartment lamp connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

Step 4. Check the bulbs of the luggage 
compartment lamp.

Check that the luggage compartment lamp bulbs are 
not burned out.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the luggage compartment lamp 
bulb.

Step 5. Connector check: C-221 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

AC310222

Connector: G-12

AI

G-12

Harness side

AC310626

Connector: C-221

Junction block (Rear view)

<LHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310620

Connector: C-221

Junction block 
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-429

Step 6. Check the wiring harness from C-221 
ETACS-ECU connector terminal No.52 to G-12 
luggage compartment lamp connector terminal 
No.2.

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector C-16, G-14, and repair if 
necessary.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

AC310626

Connector: C-221

Junction block (Rear view)

<LHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310620

Connector: C-221

Junction block 
(Rear view)

<RHD>

AC

51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

67

68

69

70

71

72

73

74

Harness side

C-221(GR)

AC310222

Connector: G-12

AI

G-12

Harness side

AC310615

AE

Connector: C-16 <LHD>

AC310631 AD

Connector: C-16 <RHD>

AC310222

AC310222

Connector: G-14

AK

2

1

4

3

13

8

11

10

5

7

12

6

14

9