Mitsubishi Lancer (4A9 engine). Manual - part 116

HEADLAMP

CHASSIS ELECTRICAL

54A-126

STEP 19. Wiring harness check between C-14 
headlamp automatic levelling-ECU connector 
terminal No. 1 and A-53 headlamp assembly (RH) 
connector terminal No. 7.

• Check the signal line for open circuit and short 

circuit.

Q: Is the check result normal?

YES : 

Go to Step 20.

NO : 

Repair the wiring harness.

STEP 20. M.U.T.-III data list
Check the headlamp automatic levelling-ECU serv-
ice data.
(1) Turn the ignition switch to the ON position.
(2) Turn the lighting switch to the HEAD position.
(3) Turn the steering wheel anticlockwise for 104

° or 

more.

(4) Turn the steering wheel clockwise for 104

° or 

more.

OK: Normal conditions is displayed.

Q: Is the check result normal?

YES : 

Go to Step 21.

NO : 

Replace the headlamp automatic levelling-
ECU.

STEP 21. Retest the system
Check that the AFS works normally.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the headlamp automatic levelling-
ECU.

Inspection Procedure 14: The bending lamp illumination timing by the steering operation is failed.

CAUTION

Before replacing the ECU, ensure that the power 
supply circuit, the earth circuit and the communi-
cation circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
headlamp automatic levelling-ECU turns ON the 
bending lamp when the rotation angle of the steering 
wheel for the speed exceeds the angle indicated in 
the Table 1. If it is not turned ON with the normal tim-
ing, the input signal system for the rotation angle of 
the steering wheel or the headlamp automatic level-
ling-ECU may be defective.
TABLE 1

PROBABLE CAUSES

• Malfunction of the steering wheel sensor

• Malfunction of the headlamp automatic levelling-

ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III data list
Check the headlamp automatic levelling-ECU serv-
ice data below.

• Turn the steering wheel.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Go to Step 2.

Item No.

Item name

Normal 
condition

Item 50

Bending lamp 
LH (CAN 
output)

System voltage

Item No.

Item name

Normal 
condition

Item 51

Bending lamp 
RH (CAN 
output)

System voltage

Vehicle 
speed (km/h)

Rotation angle from neutral 
position of steering wheel (

°)

0

104

Item No.

Item name

Normal 
condition

Item 10

SAS (Steering 
angle) (CAN 
input)

The display on 
M.U.T.-III 
changes 
together with 
the steering 
wheel 
operation.

Item 12

SAS status 
(CAN input)

Normal

HEADLAMP

CHASSIS ELECTRICAL

54A-127

STEP 2. Steering wheel sensor check
Perform the steering wheel sensor neutral position 
learning (Refer to GROUP 35C 

− Steering Wheel 

Sensor Calibration ), and then check the trouble 
symptom again.

Q: Is the check result normal?

YES : 

The diagnosis is complete.

NO : 

Replace the steering wheel sensor, and 
then go to Step 3.

STEP 3. Retest the system
Check that the bending lamps illuminate and go out 
normally.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the headlamp automatic levelling-
ECU.

Inspection Procedure 15: The welcome light function does not work normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
power supply circuit, the earth circuit and the 
communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
When the welcome light function does not operate 
normally, the keyless entry system or the ETACS-
ECU may have a problem. Or, the welcome light 
function may have been set to disabled using the 
customisation function.

PROBABLE CAUSES

• Malfunction of the keyless entry system

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. ETACS-ECU customise function check.
Check that any one of the followings other than "Dis-
abled" is set for "Welcome light" with a customisation 
function.

• Small lamp

• Head lamp

Q: Is it set to other than "Disabled"?

YES : 

Go to Step 2.

NO : 

Set "Welcome light" to any one other than 
"Disabled" with a customise function (Refer 
to ).

STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the ETACS-ECU. Refer to .

NO : 

Go to Step 3.

STEP 3. Check the keyless entry system 
operation
Check that the keyless entry system operation nor-
mally.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Troubleshoot the keyless entry system. 
Refer to GROUP 42B 

− Troubleshooting  

<KOS> or GROUP 42C 

− Troubleshooting  

<WCM>.

STEP 4. Check the tail lamps and headlamps.
When the lighting switch is operated, check that the 
tail lamps and headlamps illuminate/go off normally.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Troubleshoot the tail lamps and headlamps. 
Refer to trouble symptom chart .

STEP 5. Retest the system.
The welcome light should work normally.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the ETACS-ECU.

HEADLAMP

CHASSIS ELECTRICAL

54A-128

Inspection Procedure 16: The coming home light function does not work normally.

CAUTION

Whenever the ECU is replaced, ensure that the 
power supply circuit, the earth circuit and the 
communication circuit are normal.
COMMENTS ON TROUBLE SYMPTOM
When the coming home light function does not oper-
ate normally, the keyless entry system or the 
ETACS-ECU may have a problem. Or, the coming 
home light function may have been set to disabled 
using the customisation function.

PROBABLE CAUSES

• Malfunction of the keyless entry system

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. ETACS-ECU customise function check.
Check that any one of the followings other than "Dis-
abled" is set for "Coming home light" with a customi-
sation function.

• 15 sec

• 30 sec

• 60 sec

• 180 sec

Q: Is it set to other than "Disabled"?

YES : 

Go to Step 2.

NO : 

Set "Coming home light" to any one other 
than "Disabled" with a customise function 
(Refer to ).

STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the ETACS-ECU. Refer to .

NO : 

Go to Step 3.

STEP 3. M.U.T.-III data list
Using the ETACS-ECU service data, check the igni-
tion switch signal.

• Turn the ignition switch to the LOCK (OFF) posi-

tion.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 2 "The ignition switch 
(IG1) signal is not received" .

STEP 4. Check the headlamps.
When the lighting switch is operated, check that the 
headlamps illuminate/go off normally.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Troubleshoot the headlamps. Refer to 
trouble symptom chart .

STEP 5. Retest the system.
The coming home light function should work nor-
mally.

Q: Is the check result normal?

YES : 

The trouble can be an intermittent 

malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

NO : 

Replace the ETACS-ECU.

DATA LIST REFERENCE TABLE

M1540103800401

AFS <HEADLAMP AUTOMATIC LEVEL-
LING-ECU>

Refer to Headlamp automatic levelling system .

Item No.

Item name

Normal 
condition

Item 254

IG voltage

1 V or less

HEADLAMP

CHASSIS ELECTRICAL

54A-129

LIN <LIGHTING CONTROL SENSOR (LAMP SENSOR)>

Item No. M.U.T.-III display

Condition

Normal condition

7001

RLS IG1

When the ignition switch is turned to the 
LOCK or ACC position.

OFF

When the ignition switch is turned to the 
ON or START position.

ON

7002

RLS Lamp sensor 
sensitivity

When the customise value of the lighting 
control sensor sensitivity is set to level 1 
(quick).

Level 1 bright

When the customise value of the lighting 
control sensor sensitivity is set to level 2 
(slightly quick).

Level 2 bright

When the customise value of the lighting 
control sensor sensitivity is set to level 3 
(normal).

Level 3

When the customise value of the lighting 
control sensor sensitivity is set to level 4 
(slightly slow).

Level 4 dark

When the customise value of the lighting 
control sensor sensitivity is set to level 5 
(slow).

Level 5 dark

7004

RLS Radio ACC

When the ignition switch is turned to the 
LOCK or START position.

OFF

When the ignition switch is turned to the 
ACC or ON position.

ON

7007

RLS Vehicle speed

Perform a test run of the vehicle.

The values displayed 
on the speedometer 
and M.U.T.-III are 
almost the same.

7009

RLS Low beam "ON" 
request

When the area around the lighting control 
sensor is bright.

OFF

When the area around the lighting control 
sensor is dark.

ON

7010

RLS Judgement 
illuminance output

When the area around the lighting control 
sensor has become bright from dark

The value displayed on 
the M.U.T.-III becomes 
large.

When the area around the lighting control 
sensor has become dark from bright.

The value displayed on 
the M.U.T.-III becomes 
small.

7011

RLS Tail lamp "ON" request When the area around the lighting control 

sensor is bright.

OFF

When the area around the lighting control 
sensor is dark.

ON

7012

RLS Tunnel detect output

When the area around the lighting control 
sensor is bright.

OFF

When the area around the lighting control 
sensor is dark.

ON