Mitsubishi Grandis. Manual — part 87

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-345

Inspection Procedure O-2: The rear fog lamps do not illuminate normally.

CAUTION

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

ETACS-ECU

FUSIBLE
LINK

REAR FOG
LAMP

REAR
FOG
LAMP
RELAY

30

Rear Fog Lamp Circuit <LHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-346

POSSIBLE CAUSES

• Malfunction of the column switch

• Malfunction of the 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?

YES :

Go to Step 2.

NO :

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

P.54B-74

).

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

FUSIBLE
LINK

REAR FOG
LAMP

REAR
FOG
LAMP
RELAY

30

Rear Fog Lamp Circuit <RHD>

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-347

Step 2. Pulse check
Check the input signals below, which are related to
the rear 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 rear fog lamp switch signal is not received. :

Refer to inspection procedure Q-13 "The
rear fog lamp switch signal is not received

P.54B-465

."

Step 3. Connector check: G-23 rear fog lamp
connector <LH drive vehicles> or G-11 rear fog
lamp connector <RH drive vehicles>

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the defective connector.

Step 4. Check the bulbs of the rear fog lamps.
Check the bulb(s) of the defective lamp.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the bulb(s) of the defective 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

Rear fog lamp switch

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

AC310222

Connector: G-11

AE

G-11 (GR)

Harness side

AC310220

Connector: G-23

AE

G-23 (GR)

Harness side

SYMPTOM PROCEDURES

SMART WIRING SYSTEM (SWS) NOT USING SWS MONITOR

54B-348

Step 5. Resistance measurement at the G-23 rear
fog lamp connector <LH drive vehicles> or G-11
rear fog lamp connector <RH drive vehicles>.

(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Check the resistance between the lamp

connector and body earth.

• Resistance between G-23 rear fog lamp relay

connector <LH drive vehicles> or G-11 rear
fog lamp relay connector <RH drive vehicles>
connector terminal No.1 and body earth

OK: 2

Ω or less

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

Step 6. Check the wiring harness from G-23 rear
fog lamp connector <LH drive vehicles> or G-11
rear fog lamp connector <RH drive vehicles>
terminal No.1 to body earth.

• Check the earth wires 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.

AC310222

Connector: G-11

AE

G-11 (GR)

Harness side

AC310220

Connector: G-23

AE

G-23 (GR)

Harness side

AC310506BM

Connector
G-23 <L.H. drive vehicles> or
G-11 <R.H. drive vehicles>
(Harness side)

AC310222

Connector: G-11

AE

G-11 (GR)

Harness side

AC310220

Connector: G-23

AE

G-23 (GR)

Harness side