Mitsubishi Lancer (4A9 engine). Manual - part 113

 

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Mitsubishi Lancer (4A9 engine). Manual - part 113

 

 

HEADLAMP

CHASSIS ELECTRICAL

54A-114

YES : 

Go to Step 5.

NO : 

Refer to Inspection Procedure 8 "The auto 
lamp function does not work normally." .

STEP 5. Retest the system
Check that the headlamps illuminate 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.

Inspection Procedure 4: The headlamps do not illuminate when the passing switch is turned ON.

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 both headlamps (low-beam and high-beam) do not 
illuminate, the passing switch input circuit or ETACS-
ECU may have a problem.

PROBABLE CAUSES

• Malfunction of column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Check the operation of the headlamps.
Check that the low-beam and high-beam headlamps 
illuminate normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure 1 "None of 
the low-beam headlamps illuminate."  and 
Inspection Procedure 2 "None of the high-
beam headlamps illuminate." .

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. Retest the system
Check that the headlamps (low-beam and high-
beam) illuminates normally when turning ON the 
passing switch.

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-115

Inspection Procedure 5: One of the headlamp(s) does not illuminate.

CAUTION

If the discharge type headlamps do not illuminate, fully understand the precautions in "Service pre-
cautions for discharge headlamp" before proceeding with the troubleshooting. Refer to .

COMMENTS ON TROUBLE SYMPTOM
When one of the headlamps does not illuminate, the 
wiring harness, connector(s), or the bulb may have a 
problem, or the fuse may be burned out.

PROBABLE CAUSES

• Malfunction of the headlamp bulbs

• Malfunction of the headlamp assembly

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-35 (LH) and A-53 
(RH) headlamp assembly connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Bulb check
Check the bulb(s) of headlamp that does not illumi-
nate.
NOTE: If discharge-type low-beam headlamps do 
not illuminate, their bulbs cannot be inspected. In this 
case, assume the bulbs to be normal and proceed 
with steps.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the bulb(s) of the lamp that does 
not illuminate.

STEP 3. Resistance measurement at the A-35 
(LH) and A-53 (RH) headlamp assembly 
connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the connector of 

lamp which does not illuminate and the body 
earth.

• Measure the resistance between the A-35 

(LH), A-53 (RH) headlamp assembly connec-
tor terminal No. 6 <Vehicles without discharge 
headlamp> or terminal No. 5 <Vehicles with 
discharge headlamp> and the body earth.

OK: Continuity exists (2 

 or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Wiring harnesses check between the A-
35 (LH) and A-53 (RH) headlamp assembly 
connector terminal No. 6 <Vehicles without 
discharge headlamp> or terminal No. 5 <Vehicles 
with discharge headlamp> and the body earth

• Check the earth wires for open circuit.

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 : 

Repair the wiring harness.

STEP 5. Wiring harnesses check between A-35 
(LH) and A-53 (RH) headlamp assembly 
connector terminal No. 2 <Vehicles without 
discharge headlamp LO> / terminal No. 12 
<Vehicles with discharge headlamp LO>, or 
terminal No. 1 <HI> and the A-28X <LO> or A-19X 
<HI> headlamp relay connector terminal No. 3

• Check the power supply line for open circuit.

Q: Is the check result normal?

AC612144

AC801941

AH

Connectors: A-19X, A-28X 

A-19X

A-28X

ACA00916

A-53 (B)

Connectors: A-35, A-53

AJ

A-35 (B)

HEADLAMP

CHASSIS ELECTRICAL

54A-116

YES : 

Replace the headlamp assembly that does 

not illuminate.

NO : 

Repair the wiring harness.

Inspection Procedure 6: The high-beam indicator lamp does not illuminate.

CAUTION

Whenever the ECU is replaced, ensure that the power supply circuit, the earth circuit and the commu-
nication circuit are normal.

COMMENTS ON TROUBLE SYMPTOM
If the high-beam indicator does not illuminate nor-
mally, the harness in the CAN bus lines, connec-
tor(s), ETACS-ECU, or combination meter may have 
a problem.

PROBABLE CAUSES

• Malfunction of the ETACS-ECU

• Malfunction of combination meter

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Headlamp (high-beam) check
Check that the headlamps (high-beam) illuminate/
extinguish normally when the lighting switch is oper-
ated.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure 2 "None of 
the high-beam headlamps illuminate." .

STEP 2. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the CAN bus line (Refer to GROUP 
54C 

− Troubleshooting ).

STEP 3. 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 4.

STEP 4. M.U.T.-III other system actuator test
Perform the actuator test for the combination meter, 
and check that the high beam indicator illuminates 
(Refer to Combination Meter ).

Q: Is the check result normal?

YES : 

Replace the ETACS-ECU.

NO : 

Replace the combination meter.

INPUT SIGNAL

ETACS-ECU

DIMMER SWITCH

COMBINATION
METER

CAN COMMUNICATION LINE
(CAN_L LINE)

CAN COMMUNICATION LINE
(CAN_H LINE)

High-Beam Indicator Lamp Circuit

HEADLAMP

CHASSIS ELECTRICAL

54A-117

Inspection Procedure 7: The headlamp automatic shutdown 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.
OPERATION
The ETACS-ECU operates this function in accord-
ance with the input signals from column switch (light-
ing switch), ignition switch (IG1), and driver's door 
switch.

COMMENTS ON TROUBLE SYMPTOM
If the headlamp automatic shutdown function does 
not work normally, the above described input circuits 
or ETACS-ECU may have a problem. Also, it may be 
possible that the headlamp automatic shutdown 
function is set to "Disable" through customisation.

PROBABLE CAUSES

• Malfunction of driver's door switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Customise function check
Use the ETACS-ECU customise function to check 
that the "Head lamp auto cut customize" is set to "B-
spec."

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Use the ETACS-ECU customise function to 
set the "Head lamp auto cut customize" to 
"B-spec." (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
Use the ETACS-ECU service data to check the sig-
nals related to the operation of headlamp automatic 
shutdown function.

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

tion.

• Turn the lighting switch to the "TAIL" position.

• Turn the lighting switch to the "HEAD" position.

• Open the driver's door.

OK: Normal conditions are displayed for all 
the items.

Q: Is the check result normal?

Normal conditions are displayed for all the items. : 

Go to Step 4.

Normal condition is not displayed for item No. 254. 

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

Normal condition is not displayed for item No. 340 
or 341. : 

Troubleshoot the ETACS-ECU. Refer to 

Inspection Procedure 11 "The column 
switch signal is not received" .

Normal condition is not displayed for item No. 256. 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 5 "The front door 
switch (driver’s side) signal is not received" .

STEP 4. Retest the system
Check that the headlamp automatic shutdown func-
tion 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 ETACS-ECU.

Item No.

Item name

Normal 
condition

Item 254

IG voltage

1 V or less

Item 340

Head lamp switch 
(tail)

ON

Item No.

Item name

Normal 
condition

Item 341

Head lamp switch

ON

Item No.

Item name

Normal 
condition

Item 256

Dr door ajar switch

Open

 

 

 

 

 

 

 

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