Mitsubishi Grandis. Manual — part 270

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-542

Step 8. Check the wiring harness from D-26 seat
belt switch (RH) terminal No.1 to C-02
combination meter connector terminal No.32.

NOTE:

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

• Check the input line for open circuit.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the wiring harness.

Step 9. ETACS switch data by using the SWS
monitor

Check the input signal from the driver's seat belt
switch.

• Ignition switch: ON

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

OFF (Fastened)

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 :

Go to Step 10.

Step 10. Retest the system.

After the ETACS-ECU is replaced, check that the
driver's seat belt switch signal is received.
(1) Replace the ETACS-ECU.
(2) Check that the driver's seat belt switch signal is

received.

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 combination meter.

AC312031

Connector: C-02 <LHD>

AK

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20
40393837

23

24

25

26

27

28

29

30

31

32

33

34

35

36

2221

AC312058

Harness side

AC

Connector: D-26 <RHD>

AC312043

Connector: C-16 <RHD>

AH

9

21

33

35

24

12

3 4

7

8

5 6

39

28

41

30

18

4243

31

1920

32

40

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1617

38

27

15

37

36

26

14

13

25

2

1

34

23

11

10

22

Item No.

Item name

Normal
condition

Item 12

SEAT BELT SW

from ON
to OFF

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-543

Inspection Procedure Q-20: The front passenger's seat belt switch signal is not received. <LH drive
vehicles>

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

Input signal from the passenger’s seat belt switch is
used to operate the central door locking function. If
the signal is abnormal, the central door locking
function will not work normally.

POSSIBLE CAUSES

• Malfunction of the passenger’s seat belt switch

• Malfunction of the seat occupancy sensor

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Connector check: D-26 seat belt switch
(RH) connector

Q: Is the check result normal?

ETACS-
ECU

SEAT
BELT
SWITCH
(RH)

SEAT
OCCUPANCY
SENSOR

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

Passenger's Seat Belt Switch Input Circuit <LHD>

AC312051

Connector: D-26 <LHD>

Harness side

AD

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-544

YES :

Go to Step 2.

NO :

Repair the defective connector.

Step 2. Check the seat belt switch (RH).

Refer to GROUP 52A

− Front seat belt

P.52A-36

.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Replace the inner seat belt (front
passenger's side).

Step 3. Connector check: D-26-1 seat occupancy
sensor connector

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

Step 4. Check the seat occupancy sensor.

Refer to GROUP 52A

− Front seat

P.52A-22

.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the seat occupancy sensor.

Step 5. Resistance measurement at the D-26-1
seat occupancy sensor connector.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Resistance between D-26-1 seat occupancy

sensor connector terminal No.3 and body earth

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

Step 6. Check the wiring harness between D-26-1
seat occupancy sensor connector terminal No.3
and body earth.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES :

Replace the inner seat belt (front

passenger's side).

NO :

Repair the wiring harness.

Step 7. Connector check: C-220 ETACS-ECU
connector

Q: Is the check result normal?

AC313233

Connector: D-26-1

AB

Harness side

<LHD>

AC313233

Connector: D-26-1

AB

Harness side

<LHD>

AC301541IB

Connector D-26-1
(Harness side)

AC313233

Connector: D-26-1

AB

Harness side

<LHD>

AC312037

Connector: C-220

Junction block (Rear view)

AC

<LHD>

Harness side

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-545

YES :

Go to Step 8.

NO :

Repair the defective connector.

Step 8. Check the wiring harness from D-26-1
seat occupancy sensor connector terminal No.1
to C-220 ETACS-ECU connector terminal No.29.

NOTE:

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

• Check the input line for open circuit.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the wiring harness or replace the
inner seat belt (front passenger's side).

Step 9. ETACS switch data by using the SWS
monitor

Check the input signal from the front passenger's
seat belt switch.

• Ignition switch: ON

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

• Seat occupancy sensor: ON (Seat occupied)

Check that the MUT-III displays normal condition
when the condition above is changed to the condition
below.

• Passenger’s seat belt switch: OFF (seat belt

fastened) or seat occupancy sensor: OFF (seat
not occupied)

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.

AC312037

Connector: C-220

Junction block (Rear view)

AC

<LHD>

Harness side

AC313233

Connector: D-26-1

AB

Harness side

<LHD>

AC312033

Connector: C-16 <LHD>

AB

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

Item No.

Item name

Normal
condition

Item 43

As.SeatBeltSW

ON

Item No.

Item name

Normal
condition

Item 43

As.SeatBeltSW

OFF