Mitsubishi Lancer (4A9 engine). Manual - part 124

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-158

10

AFS/ACL:SAS(CAN input)

Turn the steering wheel anticlockwise.

Displays nearly the 
same value as the 
steering wheel 
operation angle (0

° to 

720

°).

Turn the steering wheel clockwise.

Displays nearly the 
same value as the 
steering wheel 
operation angle (0

° to −

720

°).

11

A/L:Hazard lamp SW (CAN 
input)

Hazard warning lamp switch: OFF

OFF

Hazard warning lamp switch: ON

ON

12

AFS/ACL:SAS status (CAN 
input)

When the steering wheel neutral position 
is learned by the steering wheel sensor.

Normal

When the steering wheel neutral position 
is not learned by the steering wheel 
sensor.

No initialize

When the steering wheel sensor is 
defective.

Fail
No ini. and Fail

22

A/L:Headlamp switch 
(Dimmer)

Lighting switch: High beam position

OFF

Other than above

ON

24

AFS/ACL:Reverse gear 
(CAN input)

When the shift lever or the selector lever is 
in the position other than the reverse 
position.

OFF

When the shift lever or the selector lever is 
in the reverse position.

ON

25

Headlamp SW 
position(CAN input)

When the column switch (lighting switch) 
is in the OFF position.

OFF

When the column switch (lighting switch) 
is in the position lamp position.

Position lamp

When the column switch (lighting switch) 
is in the headlamp position.

ON

When the column switch (lighting switch) 
is in the auto lamp position.

AUTO

26

AFS/ACL:Turn SW LH(CAN 
input)

When the turn-signal lamp switch (LH) is 
in the OFF position.

OFF

When the turn-signal lamp switch (LH) is 
in the ON position.

ON

27

AFS/ACL:Turn SW 
RH(CAN input)

When the turn-signal lamp switch (RH) is 
in the OFF position.

OFF

When the turn-signal lamp switch (RH) is 
in the ON position.

ON

28

Head lamp LO (CAN input) When the low-beam headlamps are OFF.

OFF

When the low-beam headlamps are ON.

ON

Item No. M.U.T.-III display

Condition

Normal condition

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-159

ACTUATOR TEST REFERENCE TABLE

M1540305300105

29

AFS/ACL:Head lamp HI 
(CAN input

When the high-beam headlamps are OFF. OFF
When the high-beam headlamps are ON.

ON

30

A/L:H/L levelling system

−

Type 1

31

A/L:H/L levelling type

−

Static type (CAN)

32

AFS/ACL:AFS/ACL type 
(CAN input)

−

Fix bending lamp

33

AFS/ACL:Parking brake 
SW(CAN in)

When the parking brake lever is released. 
(parking brake switch: OFF)

OFF

When the parking brake lever is pulled up. 
(parking brake switch: ON)

ON

34

AFS/ACL:AFS OFF SW 
(CAN output)

−

OFF (Not present)

35

AFS/ACL:Indicator (CAN 
output)

When the AFS warning is not displayed.

OFF

When the AFS warning is displayed.

ON

50

AFS/ACL:Bending lamp 
LH(CAN out)

When the bending lamp (LH) is OFF.

OFF

When the bending lamp (LH) is ON.

ON

51

AFS/ACL:Bending lamp 
RH(CAN out)

When the bending lamp (RH) is OFF.

OFF

When the bending lamp (RH) is ON.

ON

52

A/L:Fail indicator (CAN 
output)

When the headlamp automatic levelling 
warning is not displayed.

OFF

When the headlamp automatic levelling 
warning is displayed.

ON

56

A/L:Actuator output fail flag When the output voltage to the headlamp 

automatic levelling motor is normal.

OFF

When the output voltage to the headlamp 
automatic levelling motor is abnormal.

ON

57

A/L:HS power fail flag

When the output voltage to the height 
sensor is normal.

OFF

When the output voltage to the height 
sensor is abnormal.

ON

59

A/L:Rear HS signal fail flag When the signal voltage from the rear 

height sensor is normal.

OFF

When the signal voltage from the rear 
height sensor is abnormal.

ON

67

A/L:Actuator line voltage

Ignition switch: ON position

System voltage

68

A/L:Actuator output voltage Ignition switch: ON position

20% to 80% of system 
voltage

69

A/L:Indicating voltage ratio

Ignition switch: ON position

0 

− 100 %

Item No. M.U.T.-III display

Condition

Normal condition

Item No. Item name

Test item

Driven content

5

A/L:Actuator

Headlamp automatic 
levelling motor

The headlamp automatic levelling motor 
activates.

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-160

HEADLAMP AUTOMATIC LEVELLING-ECU TERMINAL VOLTAGE

M1540301900677

AC900372 AI

Connector No. C-14

Terminal 
No.

Check items

Check condition

Normal condition

1

Bending lamp (RH) input

Headlamp switch: ON

System voltage

Headlamp switch: OFF

1 V or less

2

Earth

Always

1 V or less

3

Bending lamp (LH) input

Headlamp switch: ON

System voltage

Headlamp switch: OFF

1 V or less

4, 5

−

−

−

6

Headlamp levelling unit (RH) earth

Always

1 V or less

7

Headlamp levelling unit (LH) earth

Always

1 V or less

8, 9

−

−

−

10

Headlamp relay (LO) ON signal 
(LH)

Headlamp: ON

System voltage

11

Headlamp relay (LO) ON signal 
(RH)

Headlamp: ON

System voltage

12

ECU power supply (Ignition switch: 
IG1)

Ignition switch: ON

System voltage

Ignition switch: OFF

1 V or less

13

Output to the headlamp levelling 
unit (RH)

Ignition switch: ON

When the 
levelling motor 
is stopped

1 V or less

When the 
levelling motor 
is operating

16% to 84% of 
system voltage

14

Output to the headlamp levelling 
unit (LH)

Ignition switch: ON

When the 
levelling motor 
is stopped

1 V or less

When the 
levelling motor 
is operating

16% to 84% of 
system voltage

15

−

−

−

16

Rear height sensor earth

Always

1 V or less

17

Input from the rear height sensor

Ignition switch: ON

0.5 to 4.5 V

18, 19

−

−

−

20

Rear height sensor power supply

Ignition switch: ON

5 V

21

−

Ignition switch: ON

5 V

22

CAN_L

−

−

23

CAN_H

−

−

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-161

ON-VEHICLE SERVICE

INITIALISATION OF HEADLAMP AUTOMATIC LEVELLING-ECU

M1540303300176

After the operation below is completed, initialise the 
headlamp automatic levelling-ECU.

• The headlamp automatic levelling-ECU is 

replaced.

• The rear height sensor is replaced or removed/

installed.

• The suspension related components are replaced 

or removed/installed.

INITIALISATION PROCEDURE

Before the initialisation operation, check that the 
diagnosis code No. B2511, B2512, B2514, B2516 is 
not set to the headlamp automatic levelling-ECU. If it 
is set, perform the troubleshooting before the initiali-
sation. (Refer to .)
1. Park the vehicle on a level surface.
2. If the fuel tank is not filled up, put weight in the 

luggage compartment to make up for the fuel 
shortage so that the weight will become 90% of 
full-state weight or heavier. (0.8 kg per litter)

3. There should be no other load in the vehicle other 

than driver or substituted weight of approximately 
75 kg placed in driver's position.
NOTE: Remove any load from the vehicle (Vehi-
cle tool kit and spare wheel should not be 
removed).

4. Connect the M.U.T.-III to the diagnosis connector 

(For how to connect the M.U.T.-III, refer to 
GROUP 00 

− Diagnosis function ).

5. Turn the ignition switch to "ON" position. (Do not 

start up the engine.)

6. Select the M.U.T.-III screen menu as follows.

(1) Select "AFS" displayed on the "System 

selection" screen.

(2) Select "Special function."
(3) Select "HS initial position clear."

7. The headlamp automatic levelling warning is 

displayed on the multi information display in the 
combination meter.

8. Select the M.U.T.-III screen menu as follows.

(1) Select "AFS" displayed on the "System 

selection" screen.

(2) Select "Special function."
(3) Select "HS initial position learning."

9. The headlamp automatic levelling warning on the 

multi information display in the combination meter 
is not displayed.

10.The headlamp automatic levelling-ECU 

initialisation is completed.

11.Perform the headlamp aiming (Refer to Headlamp 

Aiming .)

OPERATION CHECK OF HEADLAMP AUTOMATIC LEVELLING

M1540303400010

With this inspection, it is simply checked that the 
headlamp automatic levelling motor incorporated in 
the headlamp assembly moves in accordance with 
the vehicle posture.

INSPECTION PROCEDURE

1. Park the vehicle on a level surface.
2. Turn the ignition switch to "ON" position. (Do not 

start up the engine.)

3. At the front or rear jack up point, raise the front 

wheels or rear wheels off the earth.

4. Turn ON the headlamp switch.
5. When the front wheels are raised, the upward 

headlamp beam is controlled with the control 
value applicable to the present vehicle posture, 
and the headlamp beam moves downward.

6. When the rear wheels are raised, the downward 

headlamp beam is controlled with the control 
value applicable to the present vehicle posture, 
and the headlamp beam moves upward.

24

−

−

−

25

Headlamp levelling unit (RH) power 
supply

Ignition switch: ON

System voltage

26

Headlamp levelling unit (LH) power 
supply

Ignition switch: ON

System voltage

Terminal 
No.

Check items

Check condition

Normal condition