Mitsubishi Grandis. Manual — part 161

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-106

CENTRAL DOOR LOCKING SYSTEM

Inspection Procedure C-1: Central door locking system does not work.

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 at
all, the ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the central door locking
system functions by using the front passenger's
key cylinder.

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

Q: Is the check result normal?

ETACS-ECU

FUSIBLE
LINK

ALL DOOR LOCK ACTUATOR

Central Door Lock Power Supply Circuit

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

J/B SIDE

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-107

YES :

Go to Step 2.

NO :

Refer to Inspection Procedure C-3 "The
central door locking system does not
function by using the passenger's door key
cylinder

P.54C-110

."

Step 2. 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

ECU TO BE CHECKED

• ETACS ECU

OK: "OK" is displayed on the "ETACS ECU"
menu.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Refer to Inspection Procedure A-3
"Communication with the ETACS-ECU is
not possible

P.54C-63

."

Step 3. Connector check: C-219 ETACS-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

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

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) USING SWS MONITOR

54C-108

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) USING SWS MONITOR

54C-109

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 acutuator

• 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