Mitsubishi Grandis. Manual — part 104

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-413

Step 2. Pulse check
Check the input signals below, which are related to
the front and rear dome lamps.

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

Q: Is the check result normal?

All the signals are received normally. :

Go to Step

3.

The ignition switch (ACC) signal is not received. :

Refer to inspection procedure Q-1 "The
ignition switch (ACC) signal is not received

P.54B-416

."

The ignition switch (IG1) signal is not received. :

Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received

P.54B-420

."

All the door switch signals are not received. :

Refer to inspection procedure Q-14 "All the
door switch signals are not received

P.54B-469

."

Interior lamp loaded signal is not detected :

Refer

to inspection procedure Q-24 "Interior lamp
loaded signal is not detected

P.54B-524

."

Step 3. Customize function by using the SWS
monitor.
Check that the interior lamp automatic-shutdown
function has been enabled by using the adjustment
function.

CAUTION

The SWS monitor must be used in order to
confirm and change that setting. Use the SWS
monitor to confirm and/or change the
customized function.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Enable the interior lamp
automatic-shutdown function by using the
SWS monitor customize function (Refer to
GROUP 54C

− Customize function

P.54C-574

).

Step 4. Retest the system.
Check that the interior lamp automatic-shutdown
function 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.

System switch

Check condition

Ignition switch (ACC)

When turned from the
LOCK (OFF) position to
the ACC position

Ignition switch (IG1)

When turned from ACC
to ON

Driver's door switch

Driver's door is opened
while all the other doors
are closed.

Passenger’s door switch Passenger's door is

opened while all the
other doors are closed.

Rear door (RH) switch

Rear door (RH) is
opened while all the
other doors are closed

Rear door (LH) switch

Rear door (LH) door is
opened while all the
other doors are closed

Tailgate switch

TAilgate is opened while
all the other doors are
closed

Interior lamp loaded
signal

When a load is applied
through multi-purpose
fuse No.18

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-414

Inspection Procedure P-7: The door-ajar warning lamp does not illuminate/extinguish normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the door-ajar warning lamp does not work normally,
these input signal circuits or the ETACS-ECU may be
defective.

POSSIBLE CAUSES

• The combination meter may be defective

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check the door lamp.
When the door is opened or closed, check that the
door lamp illuminate/go off normally.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Refer to Inspection Procedure P-5 "The
door lamp illuminate normally

P.54B-399

."

Step 2. MUT-III CAN bus diagnostics.
Use the MUT-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the CAN bus line (Refer to GROUP
54D, Diagnosis

P.54D-16

).

Step 3. Check for combination meter diagnosis
code.
Check whether the combination meter-related
diagnosis code is set.

Q: Is the diagnosis code set?

YES :

Diagnose the combination meter (Refer to

GROUP 54A

− Troubleshooting

P.54A-35

).

NO :

Go to Step 4.

Step 4. Check the power supply circuit.
When the ignition switch is turned to the LOCK
(OFF) position, check if the hazard warning lamps
illuminate.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Refer to inspection procedure A-2 "Check
the ETACS-ECU battery power supply
circuit

P.54B-87

."

ETACS-
ECU

SPEED SIGNAL

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

INPUT SIGNAL

INPUT SIGNAL

· IGNITION SWITCH (IG1)
· ALL DOOR SWITCH
· TAILGATE SWITCH

Door-Ajar Warning Lamp Function

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-415

Step 5. Pulse check
Check the input signals below, which are related to
the door-ajar warning lamp.

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

Q: Are the check result normal?

All the signals are received normally. :

Go to Step

6.

The ignition switch (IG1) signal is not received. :

Refer to inspection procedure Q-2 "The
ignition switch (IG1) signal is not received"

P.54B-420

.

All the door switch or tailgate switch signals are
not received. :

Refer to inspection procedure Q-14

"All the door switch signals are not received

P.54C-505

".

The vehicle speed signal is not received. :

Refer to

inspection procedure Q-25 "The vehicle
speed signal is not received"

P.54B-529

.

Step 6. MUT-III actuator test
Perform the actuator test for the combination meter,
and check that the door-ajar warning lamp illuminate
(Refer to GROUP 54A

− Combination Meter

P.54A-78

).

Q: Is the check result normal?

YES :

Replace the ETACS-ECU.

NO :

Replace the combination meter.

System switch

Check conditions

Ignition switch (IG1)

When turned from ACC
to ON

Driver's door switch

Driver's door is opened
while all the other doors
are closed.

Passenger’s door switch Passenger's door is

opened while all the
other doors are closed.

Rear door (RH) switch

Rear door (RH) is
opened while all the
other doors are closed

Rear door (LH) switch

Rear door (LH) door is
opened while all the
other doors are closed

Tailgate switch

TAilgate is opened while
all the other doors are
closed

Tailgate switch

A tailgate opened

Vehicle speed signal

When the vehicle speed
has reached 10 km/h or
more

INPUT SIGNAL PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-416

INPUT SIGNAL PROCEDURES

Inspection Procedure Q-1: The ignition switch (ACC) signal is not received.

CAUTION

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

Ignition Switch (ACC) Input Circuit <LHD>

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

ETACS-ECU

IGNITION
SWITCH (ACC)

J/B SIDE

RELAY
BOX