Mitsubishi Evolution X. Manual — part 939

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-117

.

DIAGNOSTIC FUNCTION

When the right bulb of turn-signal light is blown, the
ETACS-ECU sets DTC B16A4.

.

TECHNICAL DESCRIPTION (COMMENT)

The ETACS-ECU sets DTC B16A4 under the follow-
ing conditions.

• If there is a malfunction to the right turn-signal

light bulb, the blown right bulb counter counts
once when the illumination of hazard or turn-sig-
nal light (right side) is attempted.

• If the blown right bulb counter reaches "3," the

DTC B16A4 is set.

.

TROUBLESHOOTING HINTS

• Malfunction of turn-signal light bulb (right side)

• Malfunction of the ETACS-ECU

• The wiring harness or connectors may have

loose, corroded, or damaged terminals, or termi-
nals pushed back in the connector

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)

STEP 1. Bulb check.
Check whether the bulb of turn-signal light which does not illu-
minate is normal.
Q: Is the check result normal?

YES : Go to Step 2.
NO : Replace the bulb of turn-signal light which does not

illuminate.

AC708948

A-02 (B)

AG

Connectors: A-02, A-57

A-57 (B)

AC708972

Connectors: C-304, C-311

AW

C-311

C-304

AC708955

Connector: D-11

AO

AC708970AI

Connector: F-06

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-118

STEP 2. Check headlight assembly (RH) connector A-57
<front>, side turn-signal light (RH) connector A-02 <side>,
rear combination light (RH) connector F-06 <rear> for
loose, corroded or damaged terminals, or terminals
pushed back in the connector.
Q: Are headlight assembly (RH) connector A-57 <front>,

side turn-signal light (RH) connector A-02 <side>, rear
combination light (RH) connector F-06 <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
(RH) connector A-57 <front>, side turn-signal light (RH)
connector A-02 <side>, and rear combination light (RH)
connector F-06 <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 body ground.

•

Measure the resistance between the headlight assem-
bly (RH) connector A-57 (terminal 6) and body ground.
<Front>

•

Measure the resistance between the side turn-signal
light (RH) connector A-02 (terminal 1) and body ground.
<side>

AC709322 AG

Harness side: A-57

AC709322 AH

Harness side: A-02

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-119

•

Measure the resistance between the rear combination
light (RH) connector F-06 (terminal 1) and body ground.
<Rear>

OK: The measured value should be continuity
exists (2 ohm 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 (RH) connector A-57 (terminal 6) <front>, side
turn-signal light (RH) connector A-02 (terminal 1) <side>,
rear combination light (RH) connector F-06 (terminal 1)
<rear> and ground.

• Check the ground wires for open circuit.

Q: Are the wiring harness between headlight assembly

(RH) connector A-57 (terminal 6) <front>, side
turn-signal light (RH) connector A-02 (terminal 1)
<side>, rear combination light (RH) connector F-06
(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.

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 and C-311 in good

condition?
YES : Go to Step 6.
NO : Repair or replace the damaged component(s). Refer

to GROUP 00E, Harness Connector Inspection

P.00E-2

.

AC709322 AI

Harness side: F-06

HEADLIGHT

TSB Revision

CHASSIS ELECTRICAL

54A-120

STEP 6. Check the wiring harness between headlight
assembly (RH) connector A-57 (terminal 3) <front>, side
turn-signal light (RH) connector A-02 (terminal 2) <side>,
rear combination light (RH) connector F-06 (terminal 2)
<rear> and ETACS-ECU connector C-304 (terminal 16)
<front or side> or C-311 (terminal 19) <rear>.
NOTE: Also check intermediate connector D-11 for loose, cor-
roded, or damaged terminals, or terminals pushed back in the
connector. If intermediate connector D-11 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

(RH) connector A-57 (terminal 3) <front>, side
turn-signal light (RH) connector A-02 (terminal 2)
<side>, rear combination light (RH) connector F-06
(terminal 2) <rear> and ETACS-ECU connector C-304
(terminal 16) <front or side> or C-311 (terminal 19)
<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.

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 if 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