Mitsubishi Lancer (4A9 engine). Manual - part 239

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-7

Code No.U0215 P/W SW (DR) LIN timeout

CAUTION

Before replacing the ECU, ensure that the communication circuit is normal.

Power Window Main Switch LIN Communication Circuit

ETACS-
ECU

INTERFACE 
CIRCUIT

LIN DRIVE 
CIRCUIT

CPU

POWER WINDOW 
MAIN SWITCH

POWER 
WINDOW 
RELAY

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

RHD

:

LHD

:

NOTE

ACA00886

AB

Connectors: C-301, C-315 <LHD>
ETACS-ECU

C-315

C-301

ACA00887

AB

Connectors: C-301, C-315 <RHD>
ETACS-ECU

C-315

C-301

AC612730

Connector: E-14 <LHD>

AH

AC612735

Connector:E-14 <RHD>

AF

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-8

JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U0215 
when no signals are received from the power window 
main switch.

PROBABLE CAUSES

• Faulty power window main switch

• Malfunction of the LIN bus

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-301 and C-315 
ETACS-ECU connector, E-14 power window main 
switch connector

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Resistance measurement at the E-14 
power window main switch connector
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the E-14 power 

window main switch connector terminal No. 10 
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 E-14 power 
window main switch connector terminal No. 10 to 
body earth
NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-125 <LHD> or C-111 
<RHD>, and repair if necessary.
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 4. Voltage measurement at the E-14 power 
window main switch connector.
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Ignition switch: ON position
(3) Measure the voltage between the E-14 power 

window main switch connector terminal No. 4 and 
the body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-9

STEP 5. Wiring harness check between the E-14 
power window main switch connector terminal 
No. 4 and the C-315 ETACS-ECU connector 
terminal No. 8
Check the power supply line for open circuit and 
short circuit.
NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-125 <LHD> or C-111 
<RHD>, and repair if necessary.

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 6. Check the wiring harness wires between 
C-301 ETACS-ECU connector terminal No. 1 and 
E-14 power window main switch connector 
terminal No. 7.
Check the communication lines for open circuit.
NOTE: Prior to the wiring harness inspection, check 
intermediate connector C-126 <LHD> or C-112 
<RHD>, and repair if necessary.

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.
Check again if the diagnosis code is set to the 
ETACS-ECU.
(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 power window main switch.

NO : 

A poor connection, open circuit, or other 
intermittent malfunctions in the LIN bus lines 
between the power window main switch and 
the ETACS-ECU (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

TROUBLESHOOTING

LOCAL INTERCONNECT NETWORK (LIN)

54B-10

Code No.U0231 Lighting control sensor LIN timeout <Vehicles with auto lamp>

CAUTION

Before replacing the ECU, ensure that the communication circuit is normal.

Lighting Control Sensor LIN Communication Circuit

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-
ECU

INTERFACE 
CIRCUIT

LIN DRIVE 
CIRCUIT

FUSE     

8

LIGHTING 
CONTROL 
SENSOR

ACA00886

AC

Connector: C-316 <LHD>
ETACS-ECU

ACA00887

AC

Connector: C-316 <RHD>
ETACS-ECU

AC612722

AM

Connector: D-02

JUDGEMENT CRITERIA
The ETACS-ECU will set diagnosis code No. U0231 
when no signals are received from the lighting con-
trol sensor.

PROBABLE CAUSES

• Faulty lighting control sensor

• Malfunction of the LIN bus