Mitsubishi Grandis. Manual - part 26

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-101

Step 4. Check the wiring harness between C-219 
ETACS-ECU connector terminal No.2 and fusible 
link (30).

NOTE: 

Prior to the wiring harness inspection, check 
intermediate connector C-125 and junction block 
connector C-204, and repair if necessary.

• Check the power supply line for open or short 

circuit.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness.

AC310626AD

Connector: C-219 <LHD>
Junction block (Rear view)

Junction block side

AC310620

Connector: C-219

Junction block 
(Rear view)

<RHD>

AB

Junction block side

AC310613

AD

Connector: C-125 <LHD>

AC310628AB

Connector: C-125 <RHD>

AC310623

Connector: C-204 <LHD>

AI

Junction block (Front view)

Harness side

C-204(B)

AC310618

Connector: C-204 <RHD>

AI

Junction block (Front view)

Harness side

C-204(B)

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-102

Step 5. Retest the system.

Check that the central door locking system works 
normally.

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-2: The central door locking system does not function by using the driver's 
door lock switch.

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 driver's door lock switch is 
operated, the driver's door lock actuator or the 
ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the driver's door lock actuator

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

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

ETACS-ECU

DOOR
UNLOCK
RELAY

DOOR
LOCK
RELAY

TAILGATE
OPEN RELAY

DRIVER'S 
DOOR LOCK
ACTUATOR 
SWITCH

INPUT SIGNAL

ALL DOOR LOCK ACTUATOR

TAILGATE
LOCK ACTUATOR

J/B SIDE

Central Door Lock (Driver's Door Lock Actuator Switch) Circuit

FUSIBLE 
LINK

30

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-103

DIAGNOSIS PROCEDURE

Step 1. Pulse check
Check the input signal, which is related to the driver's 
door lock 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

 ."

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.

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.

System switch

Check condition

Driver's door lock 
actuator switch

When the driver's key 
cylinder or inside lock 
knob is unlocked or 
locked

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) NOT USING SWS MONITOR

54B-104

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. Pulse check
Check the input signal, which is related to the front 
passenger's door 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 
front passenger’s door lock actuator signal 
is not received <LH drive 
vehicles>

P.54B-478

 or <RH drive 

vehicles>

P.54B-481

."

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.

System switch

Check condition

Front passenger's door 
key cylinder

When the front 
passenger’s key cylinder 
is unlocked or locked