Mitsubishi Grandis. Manual - part 79

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-313

Step 5. Retest the system.
Check that the turn-signal lamps illuminate 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.

Step 6. Pulse check
Check the input signals below, which are related to 
the turn-signal lamp illumination.

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 

7.

The turn-signal lamp switch (RH) 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

."

The turn-signal lamp switch (LH) signal is not 
received. : 

Refer to inspection procedure Q-6 "The 

column switch (lighting and turn-signal lamp 
and headlamp washer switch) signal is not 
received 

P.54B-438

."

Step 7. Retest the system.
Check that the turn-signal lamps illuminate.

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

Turn-signal lamp switch 
(RH)

When the turn-signal 
lamp switch (RH) is 
turned from off to on

Turn-signal lamp switch 
(LH)

When the turn-signal 
lamp switch (LH) is 
turned from off to on

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-314

Inspection Procedure N-2: The hazard warning lamps do not illuminate.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the hazard warning lamps do not illuminate, the 
hazard warning lamp input signal circuit or the 
ETACS-ECU may be defective.

POSSIBLE CAUSES

• Malfunction of the hazard warning lamp switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the turn-signal lamps operate.
Check that the turn-signal lamps illuminate normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to inspection procedure N-1 "The 
turn-signal lamps do not illuminate 

P.54B-310

."

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

HAZARD
WARNING
LAMP SWITCH

RELAY
BOX

TURN-SIGNAL
LAMP RELAY: LH

TURN-SIGNAL
LAMP RELAY: RH

INPUT SIGNAL

· FRONT TURN-SIGNAL
  LAMP (LH)

· SIDE TURN-SIGNAL
  LAMP (LH)

· REAR TURN-SIGNAL 
  LAMP (LH)

· FRONT TURN-SIGNAL
  LAMP (RH)

· SIDE TURN-SIGNAL
  LAMP (RH)

· REAR TURN-SIGNAL
  LAMP (RH)

J/B SIDE

FUSIBLE
LINK

26

Hazard Warning Lamp Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-315

Step 2. Check the power supply circuit.
When the ignition switch is at the LOCK (OFF) 
position, check that the functions below work 
normally.

• Lamp reminder function

• Central door locking system

• Room lamp (excluding interior lamp 

automatic-shutdown function)

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

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

P.54B-87

."

Step 3. Pulse check
Check the input signal from the hazard warning lamp 
switch.

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

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Refer to inspection procedure Q-12 "The 
hazard warning lamp switch signal is not 
received 

P.54B-461

."

Step 4. Retest the system.
Check that the hazard warning lamps illuminate.

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

Hazard warning lamp 
switch

When the hazard 
warning lamp switch is 
turned from off to on

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-316

Inspection Procedure N-3: Any of the turn-signal lamps does not illuminate.

CAUTION

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