Mitsubishi Lancer (4A9 engine). Manual - part 136

 

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Mitsubishi Lancer (4A9 engine). Manual - part 136

 

 

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-206

PROBABLE CAUSES

• Malfunction of the key reminder switch

• Malfunction of door switch

• Malfunction of the front door lock actuator 

(driver’s side)

• Malfunction of rear room lamp

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Front room lamp operation check
Check that the front room lamp illuminates and extin-
guishes normally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Refer to Inspection Procedure 1 "The front 
room lamp does not illuminate normally." .

STEP 2. Connector check: D-07 rear room lamp 
connector

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Rear room lamp bulb check
Check that the rear room lamp bulb is normal.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Replace the rear room lamp bulb.

STEP 4. Connector check: C-316 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the defective connector.

STEP 5. Wiring harness check between the D-07 
rear room lamp connector terminal No. 1/2 and 
the C-316 ETACS-ECU connector terminal No. 6/5

• Check the input/output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 6. Retest the system
Check that the rear room lamp illuminates/extin-
guishes 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 rear room lamp.

Inspection Procedure 3: The luggage compartment lamp does not illuminate normally.

CAUTION

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

ACA00886

AX

ETACS-ECU

Connector: C-311 <LHD>

ACA00887

AW

ETACS-ECU

Connector: C-311 <RHD>

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-207

OPERATION
The ETACS-ECU illuminates and extinguishes the 
luggage compartment lamp in accordance with the 
input signals from trunk lid latch <LANCER> or tail-
gate switch <LANCER SPORTBACK>.

COMMENTS ON TROUBLE SYMPTOM
If this does not work normally, the trunk lid latch 
<LANCER> or tailgate switch <LANCER SPORT-
BACK> input circuit, luggage compartment lamp, or 
ETACS-ECU may have a problem.

PROBABLE CAUSES

• Malfunction of trunk lid latch <LANCER> or tail-

gate switch <LANCER SPORTBACK>

• Malfunction of luggage compartment lamp

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. 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 <LANCER> : 

Go to Step 2.

NO <LANCER SPORTBACK> : 

Go to Step 7.

STEP 2. M.U.T.-III data list
Use the ETACS-ECU service data to check the sig-
nals related to the operation of luggage compartment 
lamp.

• Open the trunk lid.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 9 "The trunk lid latch 
signal is not received" .

STEP 3. Connector check: F-01 luggage 
compartment lamp connector

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Repair the defective connector.

STEP 4. Luggage compartment lamp bulb check
Check that the luggage compartment lamp bulb is 
normal.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Replace the luggage compartment lamp 
bulb.

STEP 5. Connector check: C-311 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. Wiring harness check between the F-01 
luggage compartment lamp connector terminal 
No. 1/2 and the C-311 ETACS-ECU connector 
terminal No. 17/3
NOTE: Before the wiring harness check, check the 
intermittent connector D-17, and repair that if neces-
sary.

• Check the input/output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the wiring harness.

ACA00901AH

Connector: F-01 <LANCER>

AC801775BY

Connector: F-01 <LANCER SPORTBACK>

Item No.

Item name

Normal 
condition

Item 260

Trunk/gate trunk ajar 
switch

Open

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-208

STEP 7. M.U.T.-III data list
Use the ETACS-ECU service data to check the sig-
nals related to the operation of luggage compartment 
lamp.

• Open the tailgate.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 9 "The tailgate switch 
signal is not received" .

STEP 8. Connector check: F-01 luggage 
compartment lamp connector

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Repair the defective connector.

STEP 9. Luggage compartment lamp bulb check
Check that the luggage compartment lamp bulb is 
normal.

Q: Is the check result normal?

YES : 

Go to Step 10.

NO : 

Replace the luggage compartment lamp 
bulb.

STEP 10. Connector check: C-311 ETACS-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 11.

NO : 

Repair the defective connector.

STEP 11. Wiring harness check between the F-01 
luggage compartment lamp connector terminal 
No. 1/3 and the C-311 ETACS-ECU connector 
terminal No. 3/17
NOTE: Before the wiring harness check, check the 
intermittent connector D-12, and repair that if neces-
sary.

• Check the input/output line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Repair the wiring harness.

STEP 12. Retest the system
Check that the luggage compartment lamp illumi-
nates and extinguishes 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 interior lamp automatic shutoff function does not work normally.

COMMENTS ON TROUBLE SYMPTOM
The ETACS-ECU operates the interior lamp auto-
matic shutoff function in accordance with the input 
signals below.

• Ignition switch (ACC)

• Ignition switch (IG1)

• Door switches

If this function does not work normally, these input 
signal circuit(s) or the ETACS-ECU may have a prob-
lem. Also, "Interior lamp auto cut timer" may be set to 
"Disable" through customisation.

PROBABLE CAUSES

• Malfunction of door switch

• Malfunction of the room lamp

• 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 to 
see which of the followings other than "Disable" the 
"Interior lamp auto cut timer" is set.

• 3 minutes

• 30 minutes

• 60 minutes

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Use the ETACS-ECU customise function to 
set the "Interior lamp auto cut timer" to other 
than "Disable" (Refer to ).

Item No.

Item name

Normal 
condition

Item 260

Trunk/gate trunk ajar 
switch

Open

INTERIOR LAMP

CHASSIS ELECTRICAL

54A-209

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 interior lamp automatic shutoff 
function.

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

tion.

• Open each 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. 288. 
: 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 1 "The ignition switch 
(ACC) 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" .

Normal condition is not displayed for item No. 257. 
: 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 6 "The front door 
switch (passenger’s side) signal is not 
received" .

Normal condition is not displayed for item No. 258. 
: 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 7 "The rear door 
switch (RH) signal is not received" .

Normal condition is not displayed for item No. 259. 
: 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 8 "The rear door 
switch (LH) signal is not received" .

STEP 4. Retest the system
Check that the interior lamp automatic shutoff 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.

ON-VEHICLE SERVICE

CUSTOMISE FUNCTION

M1541301200552

By operating the M.U.T.-III ETACS system or MMCS 
<Vehicles for Russia>, the following functions can be 
customised. The programmed information is held 
even when the battery is disconnected.

Item No.

Item name

Normal 
condition

Item 254

IG voltage

1 V or less

Item 288

ACC switch

OFF

Item 256

Dr door ajar switch

Open

Item 257

As door ajar switch

Open

Item 258

RR door ajar switch

Open

Item 259

RL door ajar switch

Open

 

 

 

 

 

 

 

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