Mitsubishi Evolution X. Manual - part 941

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-125

STEP 2. Lighting control sensor installation surface check
Visually check the presence of scratches or air bubbles <diam-
eter of 5 mm (0.2 inch) or more> on the windshield to which the 
lighting control sensor is installed. In addition, visually check 
that the optical coupler is not broken and that the lighting con-
trol sensor can be installed. 
Q: Is the check result normal?

YES : Go to Step 3.
NO :  Replace the windshield (Refer to GROUP 42A 

− 

Windshield 

P.42A-19

)

STEP 3. Using scan tool MB991958, Check whether the 
diagnostic trouble code is reset.
Check again if the DTC is set to LIN.
(1) Wipe the windshield surface of the lighting control sensor 

section thoroughly, and check that the surface is dry. Then, 
perform the lighting control sensor (rain sensor) adaptation. 
<Refer to GROUP 51 

− Lighting Control Sensor (Rain 

Sensor) Adaptation 

P.51-76

>.

(2) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(3) Check if DTC is set.
Q: Is the DTC set?

YES : Replace the lighting control sensor.
NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

DTC L0434: RLS Rain Sensor Error

 

DTC L0436: RLS Light Sensor Error

.

TROUBLE JUDGMENT

If a trouble occurs in the lighting control sensor, DTC 
L0434 and L0436 are stored to LIN.

.

TECHNICAL DESCRIPTION (COMMENT)

Malfunction of the lighting control sensor

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: Vehicle Communication Interface (V.C.I.)

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A (Vehicles with 

CAN communication system)

HEADLIGHT

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CHASSIS ELECTRICAL

54A-126

Using scan tool MB991958, Check whether the diagnostic 
trouble code is reset.
Check again if the DTC is set to LIN.

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958. Refer to "How to connect 

scan tool 

P.54A-105

."

(2) Erase the DTC.
(3) Turn the ignition switch from "LOCK" (OFF) position to "ON" 

position.

(4) Check if DTC is set.
Q: Is the DTC set?

YES : Replace the lighting control sensor.
NO :  The trouble can be an intermittent malfunction (Refer 

to GROUP 00 

− How to use 

Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-15

).

AC608435

Data link connector

MB991827

MB991824

MB991910

AB

HEADLIGHT

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CHASSIS ELECTRICAL

54A-127

TROUBLE SYMPTOM CHART

M1540102100302

Inspection 
Procedure 
No.

Trouble symptom

Reference 
page

1

Headlight 
and taillight

All the headlights (low-beam) do not illuminate..

P.54A-128

2

All the headlights (high-beam) do not illuminate..

P.54A-133

3

The headlights illuminate at low-beam (high-beam does not 
illuminate) regardless of the lighting switch positions.

P.54A-137

4

Headlights do not illuminate when the passing switch is operated.

P.54A-138

5

One of the headlights does not illuminate.

P.54A-140

6

High-beam indicator light does not illuminate normally.

P.54A-144

7

The headlight automatic shutdown function does not work normally.

P.54A-146

8

Daytime running light function 
does not work normally.

Halogen type headlight

P.54A-149

Discharge type headlight

P.54A-153

9

Any of the tail lights, side marker lights or the license plate lights 
does not Illuminate.

P.54A-160

10

The auto light function does not work normally.

P.54A-166

11

Turn-signal 
light

All the turn-signal lights do not illuminate.

P.54A-168

12

The comfort flashing function does not work normally.

P.54A-170

13

The turn-signal indicator lights do not illuminate.

P.54A-172

HEADLIGHT

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CHASSIS ELECTRICAL

54A-128

SYMPTOM PROCEDURES

Inspection Procedure 1: All the headlights (low-beam) do not illuminate.

CAUTION

Whenever the ECU is replaced, ensure that the power supply circuit, the ground circuit and the com-
munication circuit are normal.

Headlight Relay (Low-Beam) Circuit <Halogen Type>

ETACS-ECU

FUSIBLE
LINK

36

HEADLIGHT
RELAY (LOW)

FEED EFFECT
TRANSISTOR

RELAY BOX
 ENGINE 
 COMPARTMENT