Mitsubishi L200. Manual - part 800

LIGHTING 
CONTROL 
SENSOR

ETACS-ECU

LIN 
INTERFACE

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

FUSE     

13

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-11

TROUBLE JUDGEMENT
The ETACS-ECU receives signal from the lighting 
control sensor. If signal cannot be received at all, 
diagnosis code No.U1504 will be set.

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 lighting control sensor and the 
ETACS-ECU, the power supply system of the 
lighting control sensor, or the lighting control sen-
sor itself may be defective.

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

stored.

• If diagnosis code No.U1504 is stored as a past 

trouble, carry out diagnosis with particular 
emphasis on wiring and connector(s) in the LIN 
bus line between the lighting control sensor and 
the ETACS-ECU, and the power supply system of 
the lighting control sensor. For diagnosis proce-
dures, refer to GROUP 00, How to Use Trouble-
shooting/Inspection Service Points 

− How to 

Treat Past Trouble .

PROBABLE CAUSES

• Malfunction of the lighting control sensor

• Damaged harness wires and connectors

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-12

DIAGNOSIS PROCEDURE

STEP 1. Connector check: C-206 junction block 
connector, C-219 ETACS-ECU connector, D-38 
lighting control sensor connector

AC509935AU

Connectors: C-206, C-219 <LHD>

C-219

C-206

Harness side

C-206

C-219

Harness side

AC903877AB

Connector: D-38 <LHD>

Harness side

AC903879AB

Connector: D-38 <RHD>

Harness side

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the defective connector. Go to Step 
7.

STEP 2. Resistance measurement at the D-38 
lighting control sensor connector

AC903877AB

Connector: D-38 <LHD>

Harness side

AC903879AB

Connector: D-38 <RHD>

Harness side

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC310506LG

Connector D-38
(Harness side)

(2) Measure the resistance between the D-38 

lighting control sensor connector terminal No. 2 
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.

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-13

STEP 3. Check the wiring harness between D-38 
lighting control sensor connector terminal No. 2 
to body earth

AC903877AB

Connector: D-38 <LHD>

Harness side

AC903879AB

Connector: D-38 <RHD>

Harness side

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 D-38 
lighting control sensor connector.

AC903877AB

Connector: D-38 <LHD>

Harness side

AC903879AB

Connector: D-38 <RHD>

Harness side

(1) Disconnect the connector, and measure at the 

wiring harness side.

AC310507MM

Connector D-38 
(Harness side)

(2) Measure the voltage between the D-38 lighting 

control sensor connector terminal No. 1 and the 
body earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Go to Step 5.

DIAGNOSIS CODE PROCEDURES

LOCAL INTERCONNECT NETWORK (LIN)

54B-14

STEP 5. Check the wiring harness between C-206 
junction block connector terminal No. 3 and D-38 
lighting control sensor connector terminal No. 1

AC509934

Connector: C-206 <LHD>

Junction block (Front view)

CW

Harness side

AC903877AB

Connector: D-38 <LHD>

Harness side

AC903879AB

Connector: D-38 <RHD>

Harness side

Check the power supply line for open circuit and 
short 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.