Mitsubishi Grandis. Manual - part 275

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-562

Inspection Procedure Q-23: Each switch signal of the keyless entry transmitter is not received.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

Input signal from the keyless entry transmitter is 
used to operate the keyless entry system. If the 
signal is abnormal, the keyless entry system will not 
work normally.

• Keyless entry system

• Keyless entry hazard answerback

• Multimode keyless entry system

POSSIBLE CAUSES

• Malfunction of the keyless entry transmitter

• Defective battery of the keyless entry transmitter

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

Step 1. Pulse check

Check whether the ETACS-ECU receives signal from 
a transmitter or not. For this check, you should use 
the 2-button-type transmitter (integrated with a key), 
which cover screw is silver and has already been 
registered.
NOTE: For how to register the keyless entry 
transmitter encrypted code, refer to GROUP 42 

−

 

On-vehicle Service 

P.42-57

.

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

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Go to Step 4.

Step 2. Check the transmitter battery.

Refer to GROUP 42 

− Keyless entry system 

P.42-60

.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the keyless entry transmitter 
battery.

Step 3. Register the encrypted code, and then 
retest the system.
(1) Register the keyless entry transmitter again.
(2) Check that each signal is received from the 

keyless entry transmitter.

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 keyless entry transmitter.

Step 4. Retest the system.

Check that each signal is received from the keyless 
entry transmitter.

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.

W3Z10E39AA

KEYLESS ENTRY 
TRANSMITTER

KEYLESS ENTRY 
RECEIVER

ETACS-ECU

Transmitter Input Circuit

System switch

Check condition

Keyless entry transmitter 
"LOCK/UNLOCK" switch

When the switch is 
turned from off to on

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-563

Inspection Procedure Q-24: Interior lamp loaded signal is not detected.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

The interior lamp automatic-shutdown function 
operates in accordance with the interior lamp loaded 
signal. If this signal is abnormal, the functions below 
will not work normally.

• Interior lamps

• Interior lamp automatic-shutdown function

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connector(s)

Interior Lamp Automatic Shut-off Function Circuit

IGNITION
SWITCH (IG1)

IGNITION
SWITCH (ACC)

RELAY
BOX

<LHD>

<RHD>

· DOOR LAMP
· LUGGAGE
  COMPARTMEMT LAMP
· ROOM LAMP
· REAR PERSONAL 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

LOAD
DETERMINATION
CIRCUIT

ETACS-ECU

POWER
SOURCE

J/B SIDE

KEEP
RELAY

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-564

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 SWS communication lines are 
normal.

• Ignition switch: OFF

ECUS 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. Connector check: C-219 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Voltage measurement at the C-219 
ETACS-ECU connector.

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Turn the ignition switch to the ON position.

(3) Voltage between C-219 ETACS-ECU connector 

terminal No.8 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

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>

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>

AC312731AC

Connector C-219
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-565

Step 4. Check the wiring harness between C-219 
ETACS-ECU connector terminal No.8 and the 
ignition switch (IG1).

NOTE: 

Prior to the wiring harness inspection, check junction 
block connector C-202, and repair if necessary.

• Check the power supply line to the ignition switch 

(IG1) 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 5. Voltage measurement at the C-219 
ETACS-ECU connector.

(1) Remove the ETACS-ECU, and measure at the 

junction block side.

(2) Turn the ignition switch to the ACC position.

(3) Voltage between terminal 4 and body earth

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 6.

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>

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC312035AB

Connector: C-202

Harness side

<LHD>

Junction block (Front view)

AC312045

AB

Connector: C-202

Junction block (Front view)

Harness side

<RHD>

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>

AC312731AF

Connector C-219
(Junction block side)

2019

7

13

17

18

1615 14

10

11

12

9 8

2

6 5

3

4

1