Mitsubishi L200. Manual - part 802

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-19

STEP 5. Wiring harness check between the E-03 
power window main switch connector terminal 
No. 6 and the power window relay.

AC509952

Connector: E-03

AT

Harness side

Check the power supply line for open circuit and 
short circuit.
NOTE: 

AC901157

AB

Connectors: C-32, C-33, C-134 <LHD>

C-33

C-32

C-32 (GR)

C-33

C-134

C-134

AC903865

Connectors: C-32, C-33 <RHD>

AE

C-33

C-32 (GR)

C-32

C-33

AC903868

AG

Connector: C-122 <RHD>

Harness side

Prior to the wiring harness inspection, check interme-
diate connectors C-33, C-134 <LHD> or C-122 
<RHD> and joint connector C-32, and repair if nec-
essary.

Q: Is the check result normal?

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-20

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 between C-219 
ETACS-ECU connector terminal No.54 and E-03 
power window main switch connector terminal 
No.4.

AC509934

Connector: C-219 <LHD>

AD

C-219 (GR)

Harness side

Junction block

AC509952

Connector: E-03

AT

Harness side

NOTE: 

AC903856

Connectors: C-133, C-138 <LHD>

C-133

AH

C-138 (L)

C-133

C-138

AC903868

Connectors: C-121, C-138 <RHD>

C-121

AH

C-138 (L)

C-121

C-138

Prior to the wiring harness inspection, check joint 
connector C-138 and intermediate connector C-133 
<LHD> or C-121 <RHD>, and repair if necessary.

• Check the communication line for open circuit.

Q: Is the check result normal?

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-21

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) On completion, check that the diagnosis code is 

reset.

Q: Is the diagnosis code set?

YES : 

Replace the power window main switch.

NO : 

A poor connection, open circuit or other 
intermittent malfunction is present in the LIN 
bus lines between the power window main 
switch and the ETACS-ECU (Refer to 
GROUP 00, How to Use Troubleshooting/
Inspection Service Points 

− How to Cope 

with Intermittent Malfunctions ).

Code No.U1509: Power window sub switch (AS) time-out

LIN 
INTERFACE

POWER WINDOW 
SUB SWITCH 
(FRONT: RH)

RELAY 
BOX

POWER WINDOW 
RELAY

Front Power Window Sub Switch 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

CPU

NOTE

LHD

:

RHD

:

ETACS-ECU

TROUBLE JUDGEMENT
The ETACS-ECU receives signal from the front 
power window sub switch. If signal cannot be 
received at all, diagnosis code No.U1509 will be set.

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-22

COMMENT ON TROUBLE SYMPTOM

The M.U.T.-III shows a diagnosis code status as 

active.

• Connector(s) or wiring harness in the LIN bus 

lines between the front power window sub switch 
and the ETACS-ECU, the power supply system of 
the front power window sub switch, or the front 
power window sub switch itself may be defective.

The M.U.T.-III shows a diagnosis code status as 

stored.

• If diagnosis code No.U1509 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the LIN 
bus line between the front power window sub 
switch and the ETACS-ECU, and the power sup-
ply system of the front power window sub switch. 
For diagnosis procedures, refer to GROUP 00, 
How to Use Troubleshooting/Inspection Service 
Points 

− How to Treat Past Trouble .

PROBABLE CAUSES

• Malfunction of the front power window sub switch

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-219 ETACS-ECU 
connector, E-26 front power window sub switch 
connector

AC509934

Connector: C-219 <LHD>

AD

C-219 (GR)

Harness side

Junction block

AC509954

Connector: E-26

AS

Harness side

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector.

STEP 2. Resistance measurement at the E-26 
front power window sub switch connector

AC509954

Connector: E-26

AS

Harness side

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC310506KO

Connector E-26
(Harness side)

(2) Measure the resistance between the E-26 front 

power window sub 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 4.

NO : 

Go to Step 3.