Mitsubishi Outlander XL. Manual - part 1008

DTC B16A8: Taillight (LH) circuit short

M15410900093USA0000010000

Taillight (LH) Circuit

REAR
COMBINATION
LIGHT  (LH)

ETACS-ECU

TAILLIGHT 
CONTROL CIRCUIT

ZC6008780025

Connector: C-311

LIGHTING

54Ac-105

DIAGNOSIS

ZC6008800019

Connector: D-14

D-14

TROUBLE JUDGMENT
When an open circuit is detected in the taillight circuit,
the ETACS-ECU sets DTC B16A1. If a short circuit is
detected, DTC B16A8 is set.

TECHNICAL DESCRIPTION (COMMENT)
The problem detection of taillight is made based on
the digital feed back signal (input signal to ETACS-
ECU) which operates the taillight. When the ignition
switch  is  "ON",  the  ETACS-ECU  determines  the
taillight circuit state from the load placed on the line.
After 100 ms has elapsed since the start of the check,
the ETACS-ECU performs a sampling with each 10

ms.  If  an  abnormality  is  detected,  it  increases  the
counter by 2, and when no abnormality is detected, it
decreases  the  counter  by  1.  Once  the  counter
reaches "10", the ETACS-ECU sets the DTC B16A1
if the load is detected on the line, and sets the DTC
B16A8 if no load is detected.

TROUBLESHOOTING HINTS

｠

The wiring harness or connectors may have loose,
corroded,  or  damaged  terminals,  or  terminals
pushed back in the connector

｠

Malfunction of the ETACS-ECU

DIAGNOSIS

Required Special Tools:

｠

MB992006: Extra fine probe

｠

MB991223: Harness set

｠

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. Check rear combination light (LH) connector D-14
for loose, corroded or damaged terminals, or terminals
pushed back in the connector.

Q:Is  combination  light  (RH)  connector  D-14  in  good

condition?

YES:

 Go to Step 2.

NO:

 Repair the damaged parts.

STEP 2. Resistance measurement at rear combination light
(LH) connector D-14.

(1)

Disconnect the connector, and measure at the wiring harness
side.

54Ac-106

LIGHTING

DIAGNOSIS

ZC5015310005

Connector D-14 
(Harness side)

(2)

Measure the resistance between the rear combination light
(LH) connector D-14 (terminal No. 4) and the body ground.

The measured value should be continuity exists (2
Ω or less).

Q:Does the measured resistance value correspond with this

range?

YES:

 Go to Step 4.

NO:

 Go to Step 3.

STEP 3. Check the wiring harness between rear
combination light (LH) connector D-14 (terminal No. 4) and
ground.

Q:Is the check result normal?

YES:

 Go to Step 6.

NO:

 Repair the wiring harness.

STEP 4. Check ETACS-ECU connectors C-311 for loose,
corroded or damaged terminals, or terminals pushed back
in the connector.

Q:Is ETACS-ECU connectors C-311 in good condition?

YES:

 Go to Step 5.

NO:

 Repair the damaged parts.

STEP 5. Check the wiring harness between rear
combination light (LH) D-14 connector (terminal No. 2) and
ETACS-ECU connector C-311 (terminal No. 10).

Q:Is the wiring harness between rear combination light (LH)

D-14  connector  (terminal  No.  2)  and  ETACS-ECU

connector C-311 (terminal No. 10) in good condition?

YES:

 Go to Step 6.

NO:

 Repair the wiring harness.

LIGHTING

54Ac-107

DIAGNOSIS

STEP 6. Using scan tool MB991958, Check whether the
diagnostic trouble code is reset.

ZC501967

AC404789

ZC5019680000

MB991824

MB991827

MB991910

Data link

connector

To prevent damage to scan tool MB991958, always turn the
ignition  switch  to  the  "LOCK"  (OFF)  position  before
connecting or disconnecting scan tool MB991958.

(1)

Connect scan tool MB991958. Refer to "How to connect scan
tool P.54Ac-99."

(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.

TROUBLE SYMPTOM CHART

M15410900009USA0000010002

Trouble symptom

Inspection
Procedure No.

Reference page

The taillights do not illuminate.

1

 P.54Ac-108

Any of the taillights does not illuminate.

2

 P.54Ac-110

SYMPTOM PROCEDURES

Inspection Procedure 1: The taillights do not illuminate.

M15410900112USA0000010000

Before replacing the ECU, ensure that the power
supply  circuit,  the  ground  circuit  and  the
communication circuit are normal.

TECHNICAL DESCRIPTION (COMMENT)
If  all  the  taillights  do  not  illuminate  normally,  the
taillight switch input circuit or ETACS-ECU may have
a problem.

TROUBLESHOOTING HINTS

｠

Malfunction of column switch

｠

Malfunction of the ETACS-ECU

｠

The wiring harness or connectors may have loose,
corroded,  or  damaged  terminals,  or  terminals
pushed back in the connector

54Ac-108

LIGHTING

DIAGNOSIS