Mitsubishi Montero (2004+). Manual - part 781

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-381

INSPECTION PROCEDURE K-3: Frasher timer: One of the turn-signal light do not illuminate.

ETACS-
ECU

FRONT TURN
SIGNAL LIGHT

(LH)

(RH)

REAR COMBINATION
LIGHT

TURN-SIGNAL
LIGHT

(LH)

(RH)

JOINT
CONNECTOR (8)

JOINT
CONNECTOR (1)

COMBINATION
METER

JUNCTION
BLOCK

TURN-SIGNAL
LIGHT RELAY
: LH

TURN-SIGNAL
LIGHT RELAY
: RH

Turn-Signal Lights Circuit

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-382

.

TECHNICAL DESCRIPTION (COMMENT)
If the right or left turn-signal light does not illuminate, 
their bulb may be defective.

.

TROUBLESHOOTING HINTS

• The turn-signal light bulb may be defective

• The wiring harness or connectors may have 

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

.

AC204167

CONNECTORS : A-16, A-19

A-16

AR

A-19(B)

AC204166

CONNECTOR : A-35

AN

A-35(B)

AC204170

CONNECTORS : D-03,D-04,D-28,D-30,D-125

BM

D-03(GR)

D-04(GR)

D-125

D-28

D-30

AC204171

CONNECTOR : D-111

AG

AC204173

CONNECTORS : D-210, D-212, D-217

D-210

D-217

D-212

AV

AC204174

CONNECTOR : D-222            

AE

AC204179

CONNECTOR : G-19

AM

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-383

DIAGNOSIS

Required Special Tool:

• MB991223: Test Harness Set 

STEP 1. Verify the hazard warning light.
Q: Which turn-signal light does not illuminate?

Front turn-signal light (LH) : Go to Step 2.
Front turn-signal light (RH) : Go to Step 8.
Rear combination light (LH) : Go to Step 14.
Rear combination light (RH) : Go to Step 20.
Combination meter (LH) : Go to Step 26.
Combination meter (RH) : Go to Step 28.
Combination meter (both RH and LH) : Go to Step 30.
Front turn-signal light (LH) and combination meter (LH) 
: 

Go to Step 32.

LH side only : Refer to Inspection Procedure K-1 

"Turn-signal lights does not flash when the turn-signal 
light switch is turned on 

P.54B-372

."

RH side only : Refer to Inspection Procedure K-1 

"Turn-signal lights does not flash when the turn-signal 
light switch is turned on 

P.54B-372

."

Both LH and RH sides : Refer to Inspection Procedure K-2 

"Hazard warning light does not illuminate 

P.54B-379

."

STEP 2. Check the front turn-signal light bulb (LH).
(1) Remove the front turn-signal (LH) light bulb.
(2) Verify that the front turn-signal light bulb (LH) is not 

damaged or burned out.

Q: Is the front turn-signal (LH) light bulb in good 

condition?
YES : Go to Step 3.
NO :  Replace the front turn-signal (LH) light bulb. Verify 

that the turn-signal lights illuminate normally.

STEP 3. Check front turn-signal light (LH) connector A-19 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Is the front turn-signal light (LH) connector A-19 in good 

condition?
YES : Go to Step 4.
NO :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

. Verify that the turn-signal lights illuminate 

normally.

AC204167

CONNECTOR : A-19

HARNESS 
SIDE

A-19(B)

A-19(B)

AH

1

2

SYMPTOM PROCEDURES

TSB Revision

SIMPLIFIED WIRING SYSTEM (SWS)

54B-384

STEP 4. Check the ground circuit to the front combination 
light (LH). Test at front combination light (LH) connector 
A-19.
(1) Disconnect front combination light (LH) connector A-19 and 

measure the resistance available at the wiring harness side 
of the connector.

(2) Measure the resistance value between terminal 2 and 

ground.

• The resistance should equal 2 ohms or less.

Q: Is the measured resistance 2 ohms or less?

YES : Go to Step 6.
NO :  Go to Step 5.

STEP 5. Check the wiring harness between front 
turn-signal light (LH) connector A-19 (terminal 2) and 
ground.
Q: Is the wiring harness between front turn-signal light 

(LH) connector A-19 (terminal 2) and ground in good 
condition?
YES : Replace the socket. Verify that the turn-signal lights 

illuminate normally.

NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the turn-signal lights illuminate normally.

AC204167

CONNECTOR : A-19

HARNESS 
SIDE

A-19(B)

A-19(B)

AH

1

2

AC204786

1

2

AB

CONNECTOR A-19
(HARNESS SIDE)

AC204167

CONNECTOR : A-19

HARNESS 
SIDE

A-19(B)

A-19(B)

AH

1

2