Mitsubishi Grandis. Manual - part 276

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-566

Step 6. Check the wiring harness between C-219 
ETACS-ECU connector terminal No.4 and the 
ignition switch (ACC).

NOTE: 

AC312037

Connector: C-219

Junction block (Rear view)

Junction block side

AB

3

1

2

14

4

5

7 6

8

1110 9

1312

17

15

16

18

19

20

<LHD>

AC312047

Connector: C-219

Junction block (Rear view)

Junction block side

AB

3

1

2

14

4

5

7 6

8

1110 9

1312

17

15

16

18

19

20

<RHD>

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-567

Prior to the wiring harness inspection, check joint 
connector C-32 <LH drive vehicles>, C-01 <RH drive 
vehicles> junction block connector C-203 or 
intermediate connector C-125, and repair if 
necessary.

• Check the power supply line to the ignition switch 

(ACC) for open circuit.

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.

Step 7. Pulse check

Check the input of the interior lamp loaded signal.

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

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.

AC312043AC

Connector: C-01<RHD>

AC310613

AG

Connector: C-32 <LHD>

AC312035AD

Connector: C-203 <LHD>

Junction block (Front view)

Harness side

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AC312045

AD

Connector: C-203 <RHD>

Harness side

Junction block (Front view)

10

1

6

14

5

12

13

4

11

7

2

3

8

9

AC312031

AJ

Connector: C-125 <LHD>

38

1213

11

26

14

1

20

6

232425

37

31

36

30

10

9

2122

35

8

7

34

17

29

1819

5

4

1516

33

28

32

27

3

2

System switch

Check condition

Interior lamp 
loaded signal

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

AC312041AD

Connector: C-125 <RHD>

38

1213

11

26

14

1

20

6

232425

37

31

36

30

10

9

2122

35

8

7

34

17

29

1819

5

4

1516

33

28

32

27

3

2

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-568

Inspection Procedure Q-25: The vehicle speed signal is not received.

CAUTION

Whenever the ECU is replaced, ensure that the 
input signal circuit is normal.

COMMENTS ON TROUBLE SYMPTOM

The vehicle speed signal is used to operate the 
functions below. If the signal is abnormal, these 
functions will not work normally.

• Windshield wiper and washer (vehicle 

speed-dependent wiper function)

• Seat belt warning buzzer function

• Door ajar warning buzzer function

• Seat belt indicator lamp

• Door ajar indicator lamp

POSSIBLE CAUSES

• Malfunction of the vehicles speed sensor

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. 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 2.

NO : 

Repair the CAN bus line (Refer to GROUP 
54D 

− Diagnosis 

P.54D-16

).

Step 2. 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 

− Combination meter 

P.54A-35

).

NO : 

Go to Step 3.

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

• Enter a simulated vehicle speed.

OK: Normal condition is displayed.

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.

Speed Signal Input Circuit

ETACS-
ECU

SPEED SIGNAL

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

Item No.

Item name

Normal 
conditions

Item 03

SPEED SENSOR

Displays the speed 
which fluctuates 
within 

± 2 km/h 

from the entered 
vehicle speed.

CHECK AT ECU TERMINAL

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-569

CHECK AT ECU TERMINAL

M1549001200812

ETACS-ECU

NOTE: Terminal numbers 1 to 20 can not be measured as the ETACS-ECU is mounted on the junction block 
directly. The values are for reference only.

18

2019

7

1716

14

15

13

10

11

12

8

9

4

6 5

3 2 1

AC312902 AB

C-219

C-220

C-221

Termin
al No.

Check item

Check condition

Normal condition

1

Output to the power window relay

When the power windows are 
operative

System voltage

2

Power supply to the central door 
locking system (battery positive 
voltage)

Always

System voltage

3

Earth (for ECU)

Always

0 V

4

Ignition switch (ACC)

Ignition switch: ACC

System voltage

5

Output to room lamp

When the room lamp is on

2 V or less

6

Power supply to interior lamp 
(battery positive voltage)

Always (when the interior lamp off 
function is off)

System voltage

7

Input from left rear door switch

Left rear door switches: ON (left 
rear door open)

0 V

8

Power supply from ignition switch 
(IG1)

Ignition switch: ON

System voltage

9

Output to right turn-signal lamps

When right turn-signal lamps are on System voltage

10

Input from driver's door switch

Driver's door switch: ON (door 
open)

0 V

11

Power supply to hazard warning 
lamp (battery positive voltage)

Always

System voltage

12

Output to central door locking (for 
locking the doors)

When the door lock actuators lock 
the doors

System voltage

13

Output to central door locking (for 
unlocking the doors other than the 
driver's door)

When the door lock actuators 
unlock the doors

System voltage

14

Output to left turn-signal lamps

When the left turn-signal lamps are 
on

System voltage

15

−

−

−

16

Output to rear wiper

When rear wiper is operating

System voltage

17

Input of rear wiper automatic stop 
signal

When rear wiper is operating

System voltage

18

Power supply from ignition switch 
(ACC)

Ignition switch: ACC

System voltage