Mitsubishi Grandis. Manual — part 70

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-277

COMMENTS ON TROUBLE SYMPTOM

The ETACS-ECU operates this function in
accordance with the input signals below.

• Ignition switch (IG1)

• Driver's door switch

• Tail lamp switch

• Headlamp switch

If this function does not work normally, these input
signal circuit(s), the front-ECU or the ETACS-ECU
may be defective. Note that this function can be
disabled/enabled by the adjustment function (default
setting; enabled).

POSSIBLE CAUSES

• Malfunction of the driver's door switch

• Malfunction of the front-ECU

• Malfunction of the column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the headlamps operate.
Check that the low-beam and high-beam headlamps
work normally.

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Repair the headlamps. Refer to trouble
symptom chart

P.54B-74

.

Step 2. Pulse check
Check the input signals below, which are related to
the headlamp automatic-shutdown function.

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 (IG1) signal is not received. :

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

P.54B-420

."

The driver's door switch signal is not received. :

Refer to inspection procedure Q-5 "The
driver's door switch signal is not received
<LH drive vehicles>

P.54B-434

or <RH

drive vehicles>

P.54B-436

."

The tail lamp switch signal is not received. :

Refer

to inspection procedure Q-6 "The column
switch (lighting and turn-signal lamp switch)
signal is not received

P.54B-438

."

Step 3. Customize function by using the SWS
monitor.
Check that the headlamp automatic-shutdown
function has been enabled by using the customized
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 headlamp automatic-shutdown
function by using the customized function
(Refer to GROUP 54C, Customize function

P.54C-574

).

Step 4. Retest the system.
Replace the ETACS-ECU, and then check that the
headlamp automatic-shutdown function works
normally.
(1) Replace the ETACS-ECU.
(2) Check that the headlamp 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 front-ECU.

System switch

Check condition

Ignition switch (IG1)

When turned from ACC to
ON

Driver's door switch

When the driver's door is
opened

Tail lamp switch

When the lighting switch is
turned to the TAIL position

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-278

Inspection Procedure M-6: Any of tail/stop lamps, position lamps or licence plate lamp does not
illuminate.

CAUTION

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

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-279

FRONT-ECU

LICENCE
PLATE LAMP

RELAY
BOX

TAIL LAMP
RELAY

TAIL/STOP
LAMP
(LH)

TAIL/STOP
LAMP
(RH)

POSITION
LAMP

(LH)

(RH)

(LH)

(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

Tail lamps, Position Lamps and License Plate Lamps Circuit <LHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-280

COMMENTS ON TROUBLE SYMPTOM

If the tail/stop lamps, the position lamps or the
licence plate lamps do not illuminate, the wiring

harness connector(s), the bulb or the fuse may be
defective or burned out.

FRONT-ECU

LICENCE
PLATE LAMP

RELAY
BOX

TAIL LAMP
RELAY

TAIL/STOP
LAMP
(LH)

TAIL/STOP
LAMP
(RH)

POSITION
LAMP

(LH)

(RH)

(LH)

(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

Tail lamps, Position Lamps and License Plate Lamps Circuit <RHD>