Mitsubishi Lancer (4A9 engine). Manual - part 122

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-150

STEP 4. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code No. B2514 set?

YES : 

Go to Step 5.

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to cope with Intermittent 

Malfunctions ).

STEP 5. Connector check: F-02 rear height 
sensor connector, C-14 headlamp automatic 
levelling-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Voltage measurement at the F-02 rear 
height sensor connector.
(1) Disconnect the connector, and measure at the 

wiring harness-side connector.

(2) Turn the ignition switch to the ON position.
(3) Voltage between the F-02 rear height sensor 

connector terminal No. 1 and the body earth

OK: 5 V

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Wiring harness check between the F-02 
rear height sensor connector terminal No. 1 and 
the C-14 headlamp automatic levelling-ECU 
connector terminal No. 20.
NOTE: Before the wiring harness check, check the 
intermediate connectors C-67, D-12 and F-03, and 
then repair that if necessary.

• Check the power supply lines for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the wiring harness.

STEP 8. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code No. B2514 set?

YES : 

Go to Step 9.

NO : 

The trouble can be an intermittent 
malfunction (Refer to GROUP 00 

− How to 

use Troubleshooting/inspection Service 
Points 

− How to cope with Intermittent 

Malfunctions ).

STEP 9. M.U.T.-III data list
Disconnect the front and rear height sensor connec-
tor, and check the power supply voltage to the height 
sensor.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the headlamp automatic levelling-
ECU.

STEP 10. Rear height sensor check
Check the rear height sensor for the internal failure.

(1) Disconnect the rear height sensor connector and 

connect the special tool test harness (MB991658) 
as shown.

(2) Turn the ignition switch to the ON position.
(3) Measure the voltage of sensor connector terminal 

No. 1.

OK: 5 V

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Replace the rear height sensor.

STEP 11. Check whether the diagnosis code is 
reset.

Q: Is diagnosis code No. B2514 set?

YES : 

Replace the headlamp automatic levelling-

ECU.

NO : 

The diagnosis is complete.

Item No.

Item name

Normal 
condition

Item 3

HS power 
supply voltage

5 V

AC900275

Harness 
side

Sensor side

AB

MB991658

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-151

Code No. B2516 Rear height sensor signal error

CAUTION

Before replacing the ECU, ensure that the power supply circuit, the earth circuit and the communica-
tion circuit are normal.

DIAGNOSTIC FUNCTION
If a trouble occurs in rear height sensor, headlamp 
automatic levelling system warnings are displayed 
on the multi information display and code No. B2516 
is stored.

JUDGEMENT CRITERIA
The headlamp automatic levelling-ECU detects the 
error of the signal voltage from the rear height sensor 
(less than 0.7 V, or 4.2 V or more) or 1 second or 
longer continuously.

PROBABLE CAUSES

• Malfunction of the rear height sensor

• Malfunction of the rear height sensor installation

• Malfunction of the headlamp automatic levelling-

ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Check if diagnosis code No. B2514 is set.

Q: Is diagnosis code No. B2514 set?

YES : 

Perform the troubleshooting of the 

diagnosis code No. B2514.

NO : 

Go to Step 2.

STEP 2. Rear height sensor installation status 
check
Check that the rear height sensor is installed prop-
erly.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Install the rear height sensor properly.

STEP 3. Connector check: F-02 rear height 
sensor connector, C-14 headlamp automatic 
levelling-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. Voltage measurement at the F-02 rear 
height sensor connector.
(1) Disconnect the connector, and measure at the 

wiring harness-side connector.

(2) Turn the ignition switch to the ON position.
(3) Voltage between the F-02 rear height sensor 

ACA00892

Connector: C-14 <LHD>

AS

ACA00895AR

Connector: C-14 <RHD>

AC801775BU

Connector: F-02 <LANCER SPORTBACK>

ACA00901AD

Connector: F-02 <LANCER>

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-152

terminal No. 1 and the body earth

OK: 5 V

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

STEP 5. Wiring harness check between the F-02 
rear height sensor connector terminal No. 1 and 
the C-14 headlamp automatic levelling-ECU 
connector terminal No. 20.
NOTE: Before the wiring harness check, check the 
intermediate connectors C-67, D-12 and F-03, and 
repair that if necessary.

• Check the power supply line for open circuit.

Q: Is the check result normal?

YES : 

Replace the headlamp automatic levelling-

ECU

NO : 

Repair the wiring harness.

STEP 6. Resistance measurement at the F-02 rear 
height sensor connector.
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the F-02 rear 

height sensor connector terminal No. 3 and the 
body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Go to Step 7.

STEP 7. Wiring harness check between the F-02 
rear height sensor connector terminal No. 3 and 
the C-14 headlamp automatic levelling-ECU 
connector terminal No. 16.
NOTE: Before the wiring harness check, check the 
intermediate connectors C-31, D-12 and F-03, and 
repair that if necessary.

• Check the earth line for open circuit.

Q: Is the check result normal?

YES : 

Replace the headlamp automatic levelling-

ECU

NO : 

Repair the wiring harness.

STEP 8. Wiring harness check between the F-02 
rear height sensor connector terminal No. 2 and 
the C-14 headlamp automatic levelling-ECU 
connector terminal No. 17.
NOTE: Before the wiring harness check, check the 
intermediate connectors C-31, D-12 and F-03, and 
repair that if necessary.

• Check the signal lines for open or short circuit.

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the wiring harness.

STEP 9. rear height sensor check
Check that the rear height sensor is normal (Refer to 
).

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the rear height sensor.

STEP 10. M.U.T.-III data list
Check the rear height sensor for the signal voltage.

OK: Normal condition is displayed.

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 

Malfunctions ).

NO : 

Replace the headlamp automatic levelling-
ECU.

Item No.

Item name

Normal 
condition

Item 5

Rear HS signal 
voltage

0.7 V 

− 4.1 V

HEADLAMP AUTOMATIC LEVELLING SYSTEM

CHASSIS ELECTRICAL

54A-153

TROUBLE SYMPTOM CHART

M1540301200300

CAUTION

Before or after the troubleshooting, check the operation of the headlamp automatic levelling system. 
Refer to .

SYMPTOM PROCEDURES

Inspection Procedure 1: Malfunction of the power supply circuit system of headlamp automatic 
levelling-ECU

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
If the headlamp automatic levelling system or AFS 
functions do not work at all, the headlamp automatic 
levelling-ECU power supply system, earth system, or 
headlamp automatic levelling-ECU may have a prob-
lem.

PROBABLE CAUSES

• Malfunction of the headlamp automatic levelling-

ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-14 headlamp 
automatic levelling-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Resistance measurement at the C-14 
headlamp automatic levelling-ECU connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the C-14 

headlamp automatic levelling-ECU connector 
terminal No. 2 and the body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Go to Step 3.

STEP 3. Wiring harness check from C-14 
headlamp automatic levelling-ECU connector 
terminal No. 2 to body earth
Check the earth wires for open circuit.

Q: Is the check result normal?

Trouble symptom

Inspection 
Procedure No.

Reference 
page

Malfunction of the power supply circuit system of headlamp automatic 
levelling-ECU

1

The both headlamp automatic levelling systems (right and left) do not 
work normally.

2

One of the automatic levellings does not work.

3

ACA00892

Connector: C-14 <LHD>

AS

ACA00895AR

Connector: C-14 <RHD>