Mitsubishi Evolution X. Manual - part 937

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-109

STEP 2. Check headlight assembly (LH) connector A-40 
<front>, side turn-signal light (LH) connector A-12 <side>, 
rear combination light (LH) connector F-25 <rear> for 
loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are headlight assembly (LH) connector A-40 <front>, 

side turn-signal light (LH) connector A-12 <side>, rear 
combination light (LH) connector F-25 <rear> in good 
condition?
YES : Go to Step 3.
NO  :  Repair or replace the damaged component(s). Refer 

to GROUP 00E, Harness Connector Inspection 

P.00E-2

.

STEP 3. Resistance measurement at headlight assembly 
(LH) connector A-40 <front>, side turn-signal light (LH) 
connector A-12 <side>, and rear combination light (LH) 
connector F-25 <rear>.
(1) Disconnect the connector, and measure at the wiring 

harness side.

(2) Measure the resistance between the connector terminal of 

light which does not illuminate and ground.

•

Measure the resistance between the headlight assem-
bly (LH) connector A-40 (terminal 6) and body ground. 
<Front>

•

Measure the resistance between side turn-signal light 
(LH) connector A-12 (terminal 1) and body ground. 
<Side>

AC709322 AD

Harness side: A-40

AC709322 AE

Harness side: A-12

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-110

•

Measure the resistance between rear combination light 
(LH) connector F-25 (terminal 1) and body ground. 
<Rear>

OK: The measured value should be 2 

Ω or less.

Q: Does the measured resistance value correspond with 

this range?
YES : Go to Step 5.
NO :  Go to Step 4.

STEP 4. Check the wiring harness between headlight 
assembly (LH) connector A-40 (terminal 6) <front>, side 
turn-signal light (LH) connector A-12 (terminal 1) <side>, 
rear combination light (LH) connector F-25 (terminal 1) 
<rear> and ground.

• Check the ground wires for open circuit.

Q: Are the wiring harness between headlight assembly 

(LH) connector A-40 (terminal 6) <front>, side 
turn-signal light (LH) connector A-12 (terminal 1) 
<side>, rear combination light (LH) connector F-25 
(terminal 1) <rear> and ground in good condition?
YES : Go to Step 7.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the headlights illuminate normally.

STEP 5. Check ETACS-ECU connectors C-304 and C-311 
for loose, corroded or damaged terminals, or terminals 
pushed back in the connector.
Q: Are ETACS-ECU connectors C-304 <front or side> and 

C-311 <rear> in good condition?
YES : Go to Step 6.
NO :  Replace the bulb(s) of the light that does not 

illuminate.

AC709322 AF

Harness side: F-25

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-111

STEP 6. Check the wiring harness between headlight 
assembly (LH) connector A-40 (terminal 3) <front>, side 
turn-signal light (LH) connector A-12 (terminal 2) <side>, 
rear combination light (LH) connector F-25 (terminal 2) 
<rear> and ETACS-ECU connector C-304 (terminal 9) 
<front or side> or C-311 (terminal 18) <rear>.
NOTE: Also check intermediate connector D-17 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the 
connector. If intermediate connector D-17 is damaged, repair or 
replace the connector as described in GROUP 00E, Harness 
Connector Inspection 

P.00E-2

.

• Check the communication line for open circuit.

Q: Are the wiring harness between headlight assembly 

(LH) connector A-40 (terminal 3) <front>, side 
turn-signal light (LH) connector A-12 (terminal 2) 
<side>, rear combination light (LH) connector F-25 
(terminal 2) <rear> and ETACS-ECU connector C-304 
(terminal 9) <front or side> or C-311 (terminal 18) <rear> 
in good condition?
YES : Go to Step 7.
NO :  The wiring harness may be damaged or the 

connector(s) may have loose, corroded or damaged 
terminals, or terminals pushed back in the connector. 
Repair the wiring harness as necessary. Verify that 
the headlights illuminate normally.

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-112

STEP 7. Using scan tool MB991958, Check whether the 
diagnostic trouble code is reset.

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

position.

(5) Check whether the ETACS-ECU DTC is set.
Q: Is the DTC set?

YES : Replace the ETACS-ECU.
NO :  The procedure is complete.

AC608435

Data link connector

MB991827

MB991824

MB991910

AB