Mitsubishi Grandis. Manual - part 160

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-102

Normal conditions are displayed for all the items : 

Go to Step 3.

Normal condition is not displayed for item No.12. : 

Refer to inspection procedure Q-19 "The 
driver's seat belt switch signal is not 
received 

P.54C-537

 <LH drive vehicles> or 

P.54C-540

 <RH drive vehicles>."

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.43. : 

Refer to inspection procedure Q-20 "The 
front passenger's seat belt switch signal is 
not received 

P.54C-543

 <LH drive vehicles> 

or 

P.54C-546

 <RH drive vehicles>."

Step 3. ETACS ANALOG data by using the SWS 
monitor.

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

• Set the simulated vehicle speed at approximately 

10km/h.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to inspection procedure Q-25 "The 
vehicle speed signal is not received 

P.54C-568

."

Step 4. Retest the system.

Check that the seat belt warning buzzer function 
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.

Inspection Procedure B-3: Door-ajar warning buzzer function does not work.

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)

• All of the door switches

• Vehicle speed signal

Item No.

Item name

Normal condition

Item 03

SPEED SENSOR

8 

− 10 km/h

Door-Ajar Warning Buzzer Function

ETACS-
ECU

SPEED SIGNAL

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

INPUT SIGNAL

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

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-103

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 customize function (default 
setting; enabled). In order to change the setting, the 
SWS monitor is required.

POSSIBLE CAUSES

• Malfunction of the door switches

• Malfunction of the ETACS-ECU

• 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 "DOOR WARN BUZ" is set to other than 
"W/O FUNCTION" (one of the settings below).

• W.FUNCTION

• CONTIN ACTION

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Set "DOOR WARN BUZ" to other than "W/O 
FUNCTION" by using the SWS monitor 
customisation function (Refer to 

P.54C-574

).

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: ON

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 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 SWS communication signal, which is 
related to the door-ajar warning buzzer function.

<Selected item> ETACS

• Ignition switch: ON

• 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 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.32. : 

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

 ."

Normal condition is not displayed for item No.43. : 

Replace the ETACS-ECU.

Step 4. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU input signal related to the 
door-ajar warning buzzer function.

• Doors other than the driver's door (including the 

tailgate):  Closed to open

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

YES : 

Go to Step 5.

NO : 

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

P.54C-505

."

Item No.

Item name

Normal 
condition

Item 30

Ignition SW(IG1)

ON

Item 32

DR DOOR SW

ON

Item 43

BUZZER

ON

Item No.

Item name

Normal 
condition

Item 05

PASS DOORSW

from OFF to ON

Item 07

TRK LID LASW

from OFF to ON

Item 41

R.DOOR (RH) SW

from OFF to ON

Item 42

R.DOOR (LH) SW

from OFF to ON

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-104

Step 5. ETACS ANALOG data by using the SWS 
monitor.

Check the ETACS-ECU signal related to the 
door-ajar warning buzzer function.

• Set the simulated vehicle speed at approximately 

10 km/h.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Refer to inspection procedure Q-25 "The 
vehicle speed signal is not received 

P.54C-568

."

Step 6. Retest the system.

Check that the door-ajar warning buzzer 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 B-4: Turn-signal lamp operation sound 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.

• Turn-signal lamp switch

• Hazard warning lamp switch

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 customize function (default 
setting; disabled). In order to change the setting, the 
SWS monitor is required.

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the turn-signal lamps operate.

When the turn-signal lamp switch or the hazard 
warning lamp switch is operated, check that the 
turn-signal lamps flash.

Q: Is the check result normal?

Item No.

Item name

Normal condition

Item 03

SPEED SENSOR

8 

− 10 km/h

Turn-Signal Lamp Operation Sound Function

ETACS-ECU

INPUT SIGNAL

·HAZARD WARNING LAMP SWITCH

·IGNITION SWITCH (IG1)

·TURN-SIGNAL SWITCH

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-105

YES : 

Go to Step 2.

NO : 

First, repair the turn-signal lamp(s) (Refer to 
Trouble Symptom Chart 

P.54C-44

).

Step 2. Customize function by using the SWS 
monitor

Use the SWS monitor customisation function to 
confirm that "T/SIG.BUZZER" is set to 
"W.FUNCTION".

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Use the SWS monitor customisation 
function to set "T/SIG.BUZZER" to 
"W.FUNCTION" (Refer to 

P.54C-574

).

Step 3. 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: ON

ECUS TO BE CHECKED

• ETACS ECU

• Column ECU

OK: "OK" are displayed for all the items

Q: Are the check result normal?

Normal conditions are displayed for all the items. : 

Go to Step 4.

"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 4. SWS monitor data list

Check the SWS communication input signal, which 
are related to the turn-signal lamp operation sound 
function.

<Selected item> ETACS ECU

• Hazard warning switch: ON

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the ETACS-ECU.

Step 5. Retest the system.

Check that the turn-signal lamp operation sound 
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.

Item No.

Item name

Normal 
condition

Item 43

BUZZER

ON