Mitsubishi L200. Manual - part 703

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-179

Tool

Number

Name

Use

MB991955

a. MB991824
b. MB991827
c. MB991910
d. MB991911
e. MB991825
f. MB991826

M.U.T.-III sub-
assembly

a. Vehicle 

Communication 
Interface (V.C.I.)

b. M.U.T.-III USB 

cable

c. M.U.T.-III main 

harness A 
(Vehicles with CAN 
communication 
system)

d. M.U.T.-III main 

harness B 
(Vehicles without 
CAN 
communication 
system)

e. M.U.T.-III measure 

adapter

f. M.U.T.-III trigger 

harness

CAUTION

For vehicles with CAN 
communication, use M.U.T.-III 
main harness A to send 
simulated vehicle speed. If you 
connect M.U.T.-III main harness 
B instead, the CAN 
communication does not 
function correctly.
Check for CAN bus line

MB991223

a. MB991219
b. MB991220
c. MB991221
d. MB991222

Harness set

a. Check harness
b. LED harness
c. LED harness 

adapter

d. Probe

Continuity check and voltage 
measurement at harness wire or 
connector

a. For checking connector pin 

contact pressure

b. For checking power supply 

circuit

c. For checking power supply 

circuit

d. For connecting a locally 

sourced tester

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

a

b

c

d

e

f

DO NOT USE

MB991223

a

d

c

b

DO NOT USE

BA

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-180

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1541301500025

Refer to GROUP 00 

− Contents of troubleshooting .

CHECK CHART FOR TROUBLE 
SYMPTOMS

M1541300200344

CAUTION

• During diagnosis, a diagnosis code associ-

ated with other system may be set when the 
ignition switch is turned on with connector(s) 
disconnected. On completion, confirm all sys-
tems for diagnosis code(s). If diagnosis 
code(s) are set, erase them all.

• When the battery cable is disconnected or the 

combination meter is removed, the fuel gauge 
learned value will be erased. To let the display 
unit re-learn it, enter the vehicle speed (by 
driving the vehicle or entering simulated vehi-
cle speed) and then stop the vehicle.

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

Tool

Number

Name

Use

MB992006

Trouble symptom

Inspection 
procedure 
number

Reference page

The interior lamps (front room lamp, rear room lamp and ignition key 
cylinder illumination lamp) does not illuminate or extinguish normally.

1

P.54A-181

The front room lamp does not illuminate normally.

2

P.54A-183

The rear room lamp does not illuminate normally. <vehicles without 
sunroof>

3

P.54A-187

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-181

SYMPTOM PROCEDURES

Inspection Procedure 1: The interior lamps (front room lamp, rear room lamp and ignition key 
cylinder illumination lamp) does not illuminate or extinguish normally.

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates the interior lamps (room 
lamp, rear room lamp) in accordance with the input 
signals below.

• Ignition switch (IG1)

• Driver’s door lock actuator

• Driver’s door switch

• Passenger’s door switch

• Rear door switch

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may be defec-
tive.

PROBABLE CAUSES

• Malfunction of the door lock actuator (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 : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

Interior Lamp Circuit

FUSIBLE
LINK

POWER SOURCE

ETACS-ECU

· KEY CYLINDER ILLUMINATION LAMP
· FRONT ROOM LAMP
· REAR ROOM LAMP

20

IGNITION
SWITCH (IG1)

J/B SIDE

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-182

• Malfunction of the door switches

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-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.54A-494

.

NO : 

Go to Step 2.

STEP 2. M.U.T.-III data list
Check the input signals below, which are related to 
the interior lamps (front room lamp, rear room lamp 
and ignition key cylinder illumination lamp).

• Turn the ignition switch to the "OFF" position. 

(key inserted)

• Open the all of doors.

• When the driver's door is unlocked

OK: Normal conditions are displayed for all 
the items.

Q: Is the check result normal?

YES <All the signals are received normally.> : 

Go 

to Step 4.

NO <The door lock actuator (RH) signal is not 
received.> : 

Go to Step 3.

NO <The ignition switch (IG1) signal is not 
received.> : 

Refer to inspection procedure C-3 

"The ignition switch (IG1) signal is not 
received 

P.54A-533

."

NO <The door switches signals are not received.> : 

Refer to inspection procedure C-5 "One of 
the door switch signals is not received 

P.54A-540

."

STEP 3. Check the door lock actuator (RH).
Check that the front door lock actuator (RH) works 
normally. Refer to GROUP 42 

− Door .

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the door lock actuator (RH).

STEP 4. Retest the system.
Check that the interior lamps (front room lamp, rear 
room lamp and ignition key cylinder illumination 
lamp) 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 ).

NO : 

Replace the ETACS-ECU and register the 
ID codes (Refer to 

P.54A-39

).

Item 
No.

Item name

Normal 
condition

19

Driver's Door switch

ON

20

Driver’s door unlock switch

ON

21

Driver’s door lock switch

OFF

30

Ignition switch (IG1)

OFF

48

Passenger’s Door switch

ON

49

Rear door switch

ON