Mitsubishi Grandis. Manual - part 159

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-98

Step 10. Check the wiring harness between E-07 
sunroof motor assembly connector terminal 
No.10 and C-221 ETACS-ECU connector terminal 
No.59.

NOTE: Prior to the wiring harness inspection, check 
joint connector C-01 and intermediate connector 
C-128, and repair if necessary.

• Check the communication lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the wiring harness.

AC310651

AB

Connector: E-07 <LHD>             

Harness side

AC310655

AC

Connector: E-07 <RHD>             

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)

AC310614

AX

Connectors: C-01, C-128 <LHD>

C-128

C-128

C-01

C-01

AC310632AQ

Connectors: C-01, C-128 <RHD>

C-01

C-128

C-01

C-128

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-99

Step 11. ECU check on the SWS monitor

Check that the power supply and earth lines to the 
sunroof motor assembly and the SWS 
communication lines are normal.

• Turn the ignition switch to the ON position.

ECUS TO BE CHECKED

• SUNROOF ECU

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

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 sunroof motor assembly.

TONE ALARM

Inspection Procedure B-1: Lamp reminder buzzer function does not work normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU operates this function in 
accordance with the input signals below.

• Ignition switch (IG1)

• Driver's door switch

• Tail lamp switch

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be 
defective.

POSSIBLE CAUSES

• Malfunction of the driver's door switch

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ECU check by using the SWS monitor

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

• Ignition switch: OFF

ECUS TO BE CHECKED

• ETACS ECU

• COLUMN ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

ETACS-ECU

INPUT SIGNAL

· DRIVER'S DOOR SWITCH

· TAIL LAMP SWITCH

· IGNITION SWITCH (IG1)

· HEADLAMP SWITCH

Lamp Reminder Buzzer Function

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-100

"OK" is displayed for all the items : 

Go to Step 2.

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

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

P.54C-63

."

"NG" is displayed on the "COLUMN ECU" menu. : 

Refer to Inspection Procedure A-2 
"Communication with the column switch 
(column-ECU) is not possible 

P.54C-56

."

Step 2. Function diagnosis by using the SWS 
monitor

Check the SWS communication signal, which are 
related to the lamp reminder function.

<Selected item> BUZZER - LGT MONI. ALRM

• Ignition switch: OFF (key removed)

• lighting switch: HEAD

• Driver's door: open

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

Normal conditions are displayed for all the items : 

Go to Step 3.

Normal condition is not displayed for item No.00 or 
No.01 : 

Refer to inspection procedure Q-6 "The 

column switch (lighting and turn-signal lamp 
switch and headlamp washer switch) signal 
is not received 

P.54C-478

."

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.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>."

Normal condition is not displayed for item No.43 : 

Replace the ETACS-ECU.

Step 3. Retest the system.

The lamp reminder buzzer function should work 
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.

Item No. Item name

Normal condition

Item 00

HEADLAMP SW ON when the lighting 

switch is at HEAD

Item 01

TAIL LAMP SW ON when the lighting 

switch is at TAIL

Item 30

IG SW(IG1)

OFF

Item 32

DR DOOR SW

ON

Item 43

BUZZER

ON

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-101

Inspection Procedure B-2: Seat belt warning buzzer function does not work normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the function does not work normally, the input 
circuit system from the switches or the ETACS-ECU 
may be defective (refer to "CIRCUIT OPERATION").

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Malfunction of the driver's seat belt switch

• Malfunction of the passenger's seat belt switch

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. 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.

• Turn the ignition switch to the ON position.

ECU TO BE CHECKED

• ETACS ECU

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

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

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

P.54C-63

."

Step 2. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU signal related to the seat belt 
warning buzzer function.

• Ignition switch: ON

• Driver's seat belt switch: ON (Unfastened)

• Passenger’s seat belt switch: ON (Unfastened)

• Seat occupancy sensor: ON (Seat occupied)

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

Seat Belt Warning Buzzer Function

ETACS-
ECU

· SPEED SIGNAL
· DRIVER'S SEAT BELT SWITCH

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

INPUT SIGNAL

· IGNITION SWITCH (IG1)
· PASSENGER'S SEAT BELT SWITCH

Item No.

Item name

Normal 
condition

Item 12

SEAT BELT SW

ON

Item 30

IG SW(IG1)

ON

Item 43

As.SeatBeltSW

ON