Mitsubishi L200. Manual - part 662

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-15

Tool

Number

Name

Use

MB990784

Ornament 
remover

Lower panel and Steering column 
cover removal

MB991955

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991825
F: MB991826

M.U.T.-III sub-
assembly

A: Vehicle 

Communicati
on Interface 
(V.C.I.)

B: M.U.T.-III 

USB cable

C: M.U.T.-III 

main harness 
A (Vehicles 
with CAN 
communicatio
n system)

D: M.U.T.-III 

main harness 
B (Vehicles 
without CAN 
communicatio
n 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.
Checking ETACS-ECU (service 
data and diagnosis codes)

MB990784

MB991910

MB991826

MB991955

MB991911

MB991824

MB991827

MB991825

A

B

C

D

E

F

DO NOT USE

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-16

TROUBLESHOOTING

DIAGNOSIS TROUBLESHOOTING FLOW

M1541201400021

Refer to GROUP 00 

− Contents of Troubleshooting .

CHECK CHART FOR TROUBLE 
SYMPTOMS

M1541201100279

CAUTION

• During diagnosis, a diagnosis code associated with other system may be set when the ignition 

switch is turned on with connector(s) disconnected. On completion, confirm all systems for diag-
nosis 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 vehicle speed) and then stop the vehicle.

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

Tool

Number

Name

Use

MB991223

A

D

C

B

AZ

DO NOT USE

Trouble symptom

Inspection 
procedure 
number

Reference page

The ignition key cylinder illumination lamp does not illuminate 
normally. <Except single cab>

1

P.54A-17

Malfunction of the ignition switch power supply system

2

P.54A-22

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-17

SYMPTOM PROCEDURES

Inspection Procedure 1: The ignition key cylinder illumination lamp does not illuminate normally. 
<Except single cab>

CAUTION

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

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates this function in accord-
ance with the input signals below.

• Ignition switch (IG1)

• Key reminder switch

• Door switch (front: RH)

If this function does not work normally, these input 
signal circuit(s), the ignition key cylinder illumination 
lamp or the ETACS-ECU may be defective.

PROBABLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of the door switch (front: RH)

• Malfunction of the ignition key cylinder illumina-

tion lamp bulb

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the operation of the front room 
lamp and rear room lamp.
Check that the front room lamp and rear room lamp 
illuminate and extinguish normally.

Q: Is the check result normal?

Ignition Key Cylinder Illumination Lamp Circuit

FUSIBLE 
LINK

20

ETACS-ECU

KEY CYLINDER 
ILLUMINATION LAMP

KEY REMINDER 
SWITCH

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

WHEN
REMOVING
KEY:ON

IGNITION SWITCH

CHASSIS ELECTRICAL

54A-18

YES <Vehicles without key reminder switch> : 

Go 

to Step 2.

YES <Vehicles with key reminder switch> : 

Go to 

Step 3.

NO : 

Refer to inspection procedure 1 "The interior 
lamps (front room ramp, rear room lamp and 
ignition key cylinder illumination lamp) does 
not illuminate or extinguish normally 

P.54A-

181

."

STEP 2. M.U.T.-III data list
Check the input signals below, which are related to 
the ignition key cylinder illumination lamp.

• When the closed driver's door is opened.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

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

P.54A-540

."

STEP 3. M.U.T.-III data list
Check the input signals below, which are related to 
the ignition key cylinder illumination lamp.

• Turn the ignition switch to the "LOCK" (OFF) 

position. (key inserted)

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the ETACS-ECU.

STEP 4. Check the key reminder switch.
Check that the key reminder switch works normally. 
Refer to 

P.54A-26

.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the steering lock cylinder 
assembly.

STEP 5. Connector check: C-301 key reminder 
switch connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Check the bulb of the ignition key 
cylinder illumination lamp.
Check the bulb of the ignition key cylinder illumina-
tion lamp.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Replace the steering lock cylinder 
assembly.

Item 
No.

Item name

Normal 
condition

19

Drive’s door switch

ON

Item 
No.

Item name

Normal 
condition

28

Steering lock switch

OFF

AC903858AB

Harness side

Connector: C-301 <LHD>

AC903869AB

Harness side

Connector: C-301 <RHD>