Mitsubishi Grandis. Manual - part 162

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-110

DIAGNOSIS PROCEDURE

Step 1. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU signal, which is related to 
the driver's door lock operation.

• Driver’s door: Unlock → Lock

OK: Normal condition are displayed for all 
the items.

Q: Are the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure Q-15 "The 
driver's door lock actuator switch signal is 
not received <LH drive vehicles>

P.54C-514

 

or <RH drive vehicles>

P.54C-518

."

Step 2. Retest the system.

Check that the central door locking system works 
normally by the driver's door lock operation.

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 C-3: The central door locking system does not function by using the 
passenger's door key cylinder.

CAUTION

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

Item No.

Item name

Normal 
condition

Item 21

DR DOR LCK SW

from OFF 
to ON

Item 22

DR DOR ULK SW

from ON 
to OFF

ETACS-ECU

FUSIBLE 
LINK

ALL DOOR LOCK ACTUATOR

INPUT SIGNAL

Central Door Lock (Door Key Switch) Circuit

FRONT 
PASSENGER'S 
DOOR  KEY
SWITCH

30

· DOOR LOCK ACTUATOR 
  (FRONT: LH) <LHD>
· DOOR LOCK ACTUATOR
  (FRONT: RH) <RHD>

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

TAILGATE
OPEN RELAY

TAILGATE
LOCK ACTUATOR

J/B SIDE

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-111

COMMENT ON TROUBLE SYMPTOM

If the central door locking system does not work 
normally only when the front passenger's key 
cylinder is operated, the front passenger's door key 
switch or the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the front passenger’s door key 

switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU signal, which is related to 
the front passenger's key cylinder operation.

• passenger’s door lock key cylinder: Neutral to 

lock

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure Q-16 "The 
passenger's door lock key switch signal is 
not received <LH drive vehicles>

P.54C-521

 

or <RH drive vehicles>

P.54C-525

."

Step 2. Retest the system.

Check that the central door locking system works 
normally by the front passenger's key cylinder 
operation.

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 26

CNTR DOOR LCK

ON (only when 
operated to lock)

Item 27

CNTR DOOR ULK

OFF

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-112

Inspection Procedure C-4: The central door locking system does not function by using the tailgate 
key cylinder.

CAUTION

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

COMMENT ON TROUBLE SYMPTOM

If the central door locking system does not work 
normally only when the tailgate key cylinder is 
operated, the tailgate key switch or the ETACS-ECU 
may be defective.

POSSIBLE CAUSES

• Malfunction of the tailgate key switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. ETACS switch data by using the SWS 
monitor

Check the ETACS-ECU signal, which is related to 
the tailgate key cylinder operation.

• Tailgate key switch: Neutral to lock

OK: Normal conditions are displayed for all 
the items.

Q: Are the check result normal?

ETACS-ECU

· DOOR LOCK ACTUATOR 
  (FRONT: LH) <LHD>
· DOOR LOCK ACTUATOR
  (FRONT: RH) <RHD>

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

TAILGATE
OPEN RELAY

TAILGATE
KEY SWITCH

INPUT SIGNAL

ALL DOOR LOCK ACTUATOR

TAILGATE
LOCK ACTUATOR

Central Door Lock (Tailgate Key Switch) Circuit 

J/B SIDE

FUSIBLE 
LINK

30

Item No.

Item name

Normal 
conditions

Item 18

TRK UNLOCK SW

OFF

Item 19

GATE LOCK SW

ON (only when 
operated to 
lock)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-113

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure Q-17 "The 
tailgate key switch signal is not received 

P.54C-528

."

Step 2. Retest the system.

Check that the central door locking system works 
normally by the tailgate key cylinder operation.

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.