Mitsubishi Lancer (4A9 engine). Manual - part 108

HEADLAMP

CHASSIS ELECTRICAL

54A-94

DIAGNOSTIC FUNCTION
When the left wiring harness of turn-signal lamp is 
short circuited, the ETACS-ECU sets diagnosis code 
No. B16A3.

JUDGEMENT CRITERIA
With the diagnosis code not set, when the short cir-
cuit is detected three times consecutively, the 
ETACS-ECU sets the diagnosis code No. B16A3.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-35 headlamp 
assembly (LH) connector, A-09 side turn-signal 
lamp (LH) connector and F-23 <LANCER> or F-49 
<LANCER SPORTBACK> rear turn-signal lamp 
(LH) connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO  : 

Repair the defective connector.

STEP 2. Connector check: C-304 and C-311 
ETACS-ECU connectors

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Wiring harnesses check between A-35 
headlamp assembly (LH) connector terminal No. 
3, A-09 side turn-signal lamp (LH) connector 
terminal No. 2 or F-23 <LANCER> or F-49 
<LANCER SPORTBACK> rear turn-signal lamp 
(LH) connector terminal No. 2 and C-304 ETACS-
ECU connector terminal No. 9 or C-311 ETACS-
ECU connector terminal No. 18
NOTE: Before the wiring harness check, check the 
intermittent connector D-16, and then repair that if 
necessary.

• Check the output lines for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

STEP 4. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

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

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

ACA00887

BD

Connectors: C-304, C-311 <RHD>

ETACS-ECU

C-304

C-311

AC612744 BJ

Connector: F-23 <LANCER>

AC801775BQ

Connector: F-49 <LANCER SPORTBACK>

HEADLAMP

CHASSIS ELECTRICAL

54A-95

Code No.B16A4 Blown turn-signal lamp (RH) bulb

CAUTION

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

DIAGNOSTIC FUNCTION
When the right bulb of turn-signal lamp is blown, the 
ETACS-ECU sets diagnosis code No. B16A4.

JUDGEMENT CRITERIA
The ETACS-ECU sets diagnosis code No. B16A4 
under the following conditions.

i. With the diagnosis code not set, if there is a mal-

function to the right turn-signal lamp bulb, the 
blown right bulb counter counts once when the 
illumination of hazard or turn-signal lamp (right 
side) is attempted.

ii. If the blown right bulb counter reaches "3," the 

diagnosis code No. B16A4 is set.

PROBABLE CAUSES

• Malfunction of turn-signal lamp bulb (right side)

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Bulb check
Check whether the bulb of turn-signal lamp which 
does not illuminate is normal.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the bulb of turn-signal lamp which 
does not illuminate.

STEP 2. Connector check: A-53 headlamp 
assembly (RH) connector, A-02 side turn-signal 
lamp (RH) connector and F-08 <LANCER> or F-45 
<LANCER SPORTBACK> rear turn-signal lamp 
(RH) connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO  : 

Repair the defective connector.

ACA00916

A-53 (B)

Connectors: A-02, A-53

AI

A-02 (B)

ACA00886

BC

Connectors: C-304, C-311 <LHD>

ETACS-ECU

C-304

C-311

ACA00887

BD

Connectors: C-304, C-311 <RHD>

ETACS-ECU

C-304

C-311

AC612744 BK

Connector: F-08 <LANCER>

AC801775BR

Connector: F-45 <LANCER SPORTBACK>

HEADLAMP

CHASSIS ELECTRICAL

54A-96

STEP 3. Resistance measurement at the A-53 
headlamp assembly (RH) connector, A-02 side 
turn-signal lamp (RH) connector and F-08 
<LANCER> or F-45 <LANCER SPORTBACK> rear 
turn-signal lamp (RH) connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the connector 

terminal of lamp which does not illuminate and 
the body earth.

• Measure the resistance between the A-53 

headlamp assembly (RH) connector terminal 
No. 6 and the body earth.

• Measure the resistance between the A-02 

side turn-signal lamp (RH) connector terminal 
No. 1 and the body earth.

• Measure the resistance between the F-08 

<LANCER> or F-45 <LANCER SPORT-
BACK> rear turn-signal lamp (RH) connector 
terminal No. 1 and the body earth.

OK: Continuity exists (2 

Ω or less)

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Go to Step 4.

STEP 4. Check the wiring harness between A-53 
headlamp assembly (RH) connector terminal No. 
6, A-02 side turn-signal lamp (RH) connector 
terminal No. 1 or F-08 <LANCER> or F-45 
<LANCER SPORTBACK> rear turn-signal lamp 
(RH) connector terminal No. 1 and the body 
earth.

• Check the earth wires for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 5. Connector check: C-304 and C-311 
ETACS-ECU connectors

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Check the wiring harness between A-53 
headlamp assembly (RH) connector terminal No. 
3, A-02 side turn-signal lamp (RH) connector 
terminal No. 2 or F-08 <LANCER> or F-45 
<LANCER SPORTBACK> rear turn-signal lamp 
(RH) connector terminal No. 2 and C-304 ETACS-
ECU connector terminal No. 16 or C-311 ETACS-
ECU connector terminal No. 19.
NOTE: Before the wiring harness check, check the 
intermittent connector D-12, and repair them if nec-
essary.

• Check the output lines for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

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

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

Code No.B16A5 Turn-signal lamp (RH) short circuit

CAUTION

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

ACA00916

A-53 (B)

Connectors: A-02, A-53

AI

A-02 (B)

HEADLAMP

CHASSIS ELECTRICAL

54A-97

DIAGNOSTIC FUNCTION
When the right wiring harness of turn-signal lamp is 
short circuited, the ETACS-ECU sets the diagnosis 
code No. B16A5.

JUDGEMENT CRITERIA
With the diagnosis code not set, when the short cir-
cuit is detected three times consecutively, the 
ETACS-ECU sets the diagnosis code No. B16A5.

PROBABLE CAUSES

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-53 headlamp 
assembly (RH) connector, A-02 side turn-signal 
lamp (RH) connector and F-08 <LANCER> or F-45 
<LANCER SPORTBACK> rear turn-signal lamp 
(RH) connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO  : 

Repair the defective connector.

STEP 2. Connector check: C-304 and C-311 
ETACS-ECU connectors

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Check the wiring harness between A-53 
headlamp assembly (RH) connector terminal No. 
3, A-02 side turn-signal lamp (RH) connector 
terminal No. 2 or F-08 <LANCER> or F-45 
<LANCER SPORTBACK> rear turn-signal lamp 
(RH) connector terminal No. 2 and C-304 ETACS-
ECU connector terminal No. 16 or C-311 ETACS-
ECU connector terminal No. 19.
NOTE: Before the wiring harness check, check the 
intermittent connector D-12, and repair them if nec-
essary.

• Check the output lines for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the wiring harness.

STEP 4. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

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

− How to 

use Troubleshooting/inspection Service 
Points 

− How to Cope with Intermittent 

Malfunction ).

ACA00886

BC

Connectors: C-304, C-311 <LHD>

ETACS-ECU

C-304

C-311

ACA00887

BD

Connectors: C-304, C-311 <RHD>

ETACS-ECU

C-304

C-311

AC612744 BK

Connector: F-08 <LANCER>

AC801775BR

Connector: F-45 <LANCER SPORTBACK>