Mitsubishi Lancer (4A9 engine). Manual - part 227

ETACS

CHASSIS ELECTRICAL

54A-570

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 9: The tailgate switch signal is not received. <LANCER SPORTBACK>

CAUTION

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

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

Tailgate Switch Input Circuit

ETACS-
ECU

TAILGATE 
SWITCH

ETACS

CHASSIS ELECTRICAL

54A-571

COMMENTS ON TROUBLE SYMPTOM
If there is an error to the tailgate switch input signal, 
the tailgate switch signal is no longer output to the 
communication line.

PROBABLE CAUSES

• Malfunction of tailgate switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1.Connector check: F-47 tailgate switch 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Tailgate switch check
Refer to GROUP 42A 

− Tailgate .

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the tailgate switch.

STEP 3. Resistance measurement at the F-47 
tailgate switch connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the F-47 tailgate 

switch 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. Wiring harness check between the F-47 
tailgate switch connector terminal No. 1 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. Connector check C-313 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

AC701240

AU

Connector: C-313 <LHD>
ETACS-ECU

C-313 (BR)

AC701241

BA

Connector: C-313 <RHD>
ETACS-ECU

C-313 (BR)

AC801769AN

Connector: D-17

AC801775AY

F-47

F-39

Connectors: F-39, F-47

ETACS

CHASSIS ELECTRICAL

54A-572

STEP 6. Wiring harness check between the F-47 
tailgate switch connector terminal No. 2 and the 
C-313 ETACS-ECU connector terminal No. 5.
Check the input line for open circuit.
NOTE: Prior to the wiring harness inspection, check 
intermediate connector D-17 and F-39, and repair if 
necessary.

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Repair the wiring harness.

STEP 7. M.U.T.-III data list
Open the tailgate.

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 

Malfunction ).

NO : 

Replace the ETACS-ECU.

 Inspection Procedure 10: The hazard warning lamp switch signal is not received.

CAUTION

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

Item No.

Item name

Normal 
conditio
n

Item 260

Trunk/gate trunk ajar 
switch

Open

Hazard Warning Lamp Switch Input Circuit

ETACS-
ECU

CENTRE
PANEL
UNIT

HAZARD
WARNING
LAMP
SWITCH

Wire colour code 
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue 
BR : Brown     O : Orange     GR : Grey     R : Red     P : Pink     V : Violet     PU : Purple     SI : Silver

ETACS

CHASSIS ELECTRICAL

54A-573

COMMENTS ON TROUBLE SYMPTOM
The hazard warning lamp switch input signal is used 
for the operation judgement of hazard warning lamp. 
Therefore, if the signal is abnormal, the hazard warn-
ing lamp will not illuminate.

PROBABLE CAUSES

• Malfunction of centre panel unit

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-10 centre panel unit 
connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Check the hazard warning lamp switch.
Check the hazard warning lamp switch. Refer to .

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Replace the centre panel unit.

STEP 3. Connector check: C-10 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. Wiring harness check between the C-301 
ETACS-ECU connector terminal No. 19 and the C-
10 centre panel unit connector terminal No. 5

• Check the input line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the wiring harness.

STEP 5. M.U.T.-III data list
Turn ON the hazard warning lamp switch.

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 

Malfunction ).

NO : 

Replace the ETACS-ECU.

AC701094

Connector: C-10 <LHD>

AB

AC701122

Connector: C-10 <RHD>

AB

AC701240

AV

ETACS-ECU

Connector: C-301 <LHD>

AC701241

BB

Connector: C-301 <RHD>

ETACS-ECU

Item No.

Item name

Normal 
condition

Item 265

Hazard switch

ON