Mitsubishi Grandis. Manual — part 86

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-341

Step 25. 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 rear turn-signal lamp assembly.

Inspection Procedure N-4: The turn-signal indicator lamp does not illuminate.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM

If the turn-signal indicator lamp does not illuminate
normally, connector(s), wiring harness in the CAN
bus lines, the ETACS-ECU or the combination meter
may be defective.

POSSIBLE CAUSES

• The CAN bus line is defective.

• The combination meter may be defective

• The ETACS-ECU may be defective

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

Step 1. Check that the hazard warning lamps
operate.
Check that the hazard warning lamps illuminate
normally.

Q: Is check result normal?

YES :

Go to Step 2.

NO :

First, repair the turn-signal lamp. Refer to
Inspection Procedure N-2 "The hazard
warning lamps do not illuminate

P.54C-321

."

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. MUT-III diagnosis code
When the ignition switch is turned to the LOCK
(OFF) position, check that the ETACS-ECU does not
set the diagnosis code.

Q: Is the diagnosis code set?

YES :

Refer to diagnosis code chart

P.54B-29

.

NO :

Go to Step 4.

Step 4. MUT-III actuator test
Perform the actuator test for the combination meter,
and check that the turn-signal indicator lamps
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.

INPUT SIGNAL

ETACS-ECU

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

· TURN-SIGNAL LAMP SWITCH
· HAZERD WARNING LAMP SWITCH

Turn-Signal Indicator Lamp Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-342

FOG LAMP

Inspection Procedure O-1: The front fog lamps do not illuminate normally.

CAUTION

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

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the front fog lamp switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSTIC PROCEDURE

Step 1. Check that the tail/stop lamps and
headlamps operate.
Check that the tail/stop lamps and headlamps
illuminate normally.

Q: Is the check result normal?

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

RELAY
BOX

FRONT FOG
LAMP RELAY

FRONT-ECU

FRONT
FOG LAMP
(LH)

FRONT
FOG LAMP
(RH)

FUSIBLE
LINK

26

Front Fog Lamp Circuit

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-343

YES :

Go to Step 2.

NO :

Check the tail/stop lamps and the
headlamps (Refer to trouble symptom chart

P.54B-74

).

Step 2. Pulse check
Check the input signals below, which are related to
the front fog 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 (IG1) signal is not received. :

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

P.54B-420

."

The tail lamp switch 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

."

The headlamp switch 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

."

The front fog lamp switch signal is not received. :

Refer to inspection procedure Q-4 "The
front fog lamp switch signal is not received

P.54B-430

."

Step 3. Connector check: A-08X front fog lamp
relay connector.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

Step 4. Check the front fog lamp relay.
Refer to GROUP 54A

− Front fog lamp

P.54A-93

.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the front fog lamp relay.

Step 5. Voltage measurement at the A-08X front
fog lamp relay connector.

(1) Remove the front fog lamp relay, and measure at

the relay box side.

(2) Check the voltage between the front fog lamp

System switch

Check condition

Ignition switch (IG1)

When turned from ACC
to ON

Tail lamp switch

When the lighting switch
is turned to the TAIL
position

Headlamp switch

When the lighting switch
is turned to the
HEADLAMP position

Front fog lamp switch

When the front fog lamp
switch is turned from off
to on

AC311521AD

Connector: A-08X

1

3

2

4

Front of
vehicle

Relay box side

AC311521AD

Connector: A-08X

1

3

2

4

Front of
vehicle

Relay box side

AC310507BV

Connector A-08X
(Relay box side)

2

4

1

3

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-344

relay connector and body earth.

• Voltage between A-08X front fog lamp relay

connector terminal No.1 and body earth

• Voltage between A-08X front fog lamp relay

connector terminal No.2 and body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

Step 6. Check the wiring harness between A-08X
front fog lamp relay connector (terminal Nos.1
and 2) and the fusible link (26).

• Check the power supply line for open circuit.

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 :

Repair the wiring harness.

Step 7. Connector check: A-14X front-ECU
connector

Q: Is the check result normal?

YES :

Go to Step 8.

NO :

Repair the defective connector.

Step 8. Check the wiring harness between A-08X
front fog lamp relay connector terminal No.3 and
A-14X front-ECU connector terminal No.1.

• Check the output lines for open circuit.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the wiring harness.

Step 9. Retest the system.
Check that the front fog 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.

AC311521AD

Connector: A-08X

1

3

2

4

Front of
vehicle

Relay box side

AC311521AB

Connector: A-14X

Relay box side

AC311937AB

Connectors: A-08X, A-14X

1

3

2

4

Front of
vehicle

Relay box side

A-08X

A-14X

A-08X

A-14X