Mitsubishi Grandis. Manual - part 27

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-105

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. Pulse check
Check the input signal, which is related to the tailgate 
key cylinder operation.

OK: The MUT-III sound or the voltmeter 
needle fluctuate.

Q: Is 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.54B-478

 

or <RH drive vehicles>

P.54B-481

."

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

System switch

Check condition

Tailgate key cylinder

When the front tail gate 
key cylinder is unlocked 
or locked

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-106

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.

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-107

Inspection Procedure C-5: A door can not be locked or unlocked by the central door locking system. 
<LH drive vehicles>

ETACS-ECU

DOOR LOCK
ACTUATOR
(FRONT: LH)

DOOR LOCK
ACTUATOR
(FRONT: RH)

DOOR LOCK
ACTUATOR
(REAR: LH)

DOOR LOCK
ACTUATOR
(REAR: RH)

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   

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

J/B SIDE

Central Door Lock Circuit <LHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-108

COMMENT ON TROUBLE SYMPTOM

If a door or the tailgate can not be locked or unlocked 
by the central door locking system, the door lock 
actuator or the tailgate lock actuator may be 
defective.

POSSIBLE CAUSES

• Malfunction of the door lock actuator

• Malfunction of the tailgate lock actuator

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Confirm which door lock actuator is 
defective.

Q: Which door fails to lock correctly?

Driver's door : 

Go to Step 2.

Front passenger's door : 

Go to Step 6.

Rear right door : 

Go to Step 10.

Rear left door : 

Go to Step 14.

Step 2. Connector check: F-04 door lock actuator 
(front: LH) connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

Step 3. Check the door lock actuator (front: LH)
Check that the door lock actuator (front: LH) works 
normally. Refer to GROUP 42 

− Door 

P.42-38

.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the door lock actuator (front: LH).

Step 4. Connector check: C-219, C-220 
ETACS-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

AC311150

AC

Connector: F-04 <LHD>

Harness side

F-04(B)

AC310627

Connectors: C-219, C-220 
<LHD>

C-220

AB

C-220

Junction block (Rear view)

Junction block side

C-219

C-219

Harness side