Mitsubishi Outlander (2013+). Manual - part 663

MB992006

REAR COMBINATION LAMP

CHASSIS ELECTRICAL

54A-137

TROUBLESHOOTING

STANDARD FLOW OF DIAGNOSTIC 
TROUBLESHOOTING

M1541402500133

Refer to GROUP 00 

− Contents of troubleshooting .

DIAGNOSIS FUNCTION

M1541400900083

HOW TO READ DIAGNOSIS CODE

Refer to GROUP 00 

− Diagnosis function .

HOW TO ERASE DIAGNOSIS CODE

Refer to GROUP 00 

− Diagnosis function .

DIAGNOSIS CODE CHART

M1541400200299

CAUTION

On troubleshooting, if the ignition switch is turned ON while disconnecting connector(s), diagnosis 
code(s) associated with other system may be set. On completion, confirm all systems for diagnosis 
code(s). If diagnosis code(s) are set, erase them all.

Diagnosis code No.

Diagnostic item

Reference page

B16A7

Tail lamp (RH) circuit short <Short circuit in the 
position lamp (RH) circuit or the tail lamp (RH) 
circuit>

P.54A-137

B16A8

Tail lamp (LH) circuit short <Short circuit in the 
position lamp (LH) circuit, tail lamp (LH) circuit or the 
licence plate lamp circuit>

P.54A-139

DIAGNOSIS CODE PROCEDURES

Code No.B16A7 Tail lamp (RH) circuit short <Short circuit in the position lamp (RH) circuit or the tail 
lamp (RH) circuit>

CAUTION

• Before replacing the ECU, ensure that the 

power supply circuit, the earth circuit and the 
communication circuit are normal.

• When the ETACS-ECU of vehicles without 

KOS is replaced, the encrypted code of the 
ignition key needs to be registered to the 
ETACS-ECU. (If the encrypted code is not reg-
istered, the engine cannot be started. Regis-

ter the encrypted code as described in 
Immobilizer System 

− How to Register Key ID 

P.54A-33

.)

DIAGNOSTIC FUNCTION

When a short circuit is detected in the position lamp 
circuit or the tail lamp circuit, the ETACS-ECU sets 
the diagnosis code No. B16A7.

MB992006

Extra fine probe

Continuity check and voltage 
measurement at harness wire or 
connector

MB990784

MB990784

Ornament 
remover

Removal of rear combination lamp 
assembly

Tool

Number

Name

Use

REAR COMBINATION LAMP

CHASSIS ELECTRICAL

54A-138

JUDGEMENT CRITERIA

The problem detection of tail lamp is made based on 
the digital feed back signal (input signal to 
ETACS-ECU) which operates the tail lamp. When the 
ignition switch is ON, the ETACS-ECU determines 
the tail lamp 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 diag-
nosis code No. B16A7 if no load is detected.

PROBABLE CAUSES

• Malfunction of bulbs

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Bulb check
Check the bulb(s) of the lamp that does not illumi-
nate.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the bulb(s) of the lamp that does 
not illuminate.

STEP 2. Resistance measurement at the 
headlamp assembly (position: RH) connector, 
rear combination lamp (tail: RH) connector (earth 
terminals).
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the connector 

terminal of lamp which does not illuminate and 

the body earth.

• Measure the resistance between the head-

lamp assembly (position: RH) connector 
(earth terminal) and body earth.

• Measure the resistance between the rear 

combination lamp (tail: RH) connector (earth 
terminal) and 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.

STEP 3. Check of open circuit in earth lines 
between the headlamp assembly (position: RH) 
connector , rear combination lamp (tail: RH) 
connector and body earth.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector(s) or wiring harness.

STEP 4. Check of short to power supply, short to 
earth, and open circuit in (TAR1, TAR2) lines 
between the headlamp assembly (position: RH) 
connector , rear combination lamp (tail: RH) 
connector and ETACS-ECU connector.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector(s) or wiring harness.

STEP 5. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The diagnosis is complete.

REAR COMBINATION LAMP

CHASSIS ELECTRICAL

54A-139

Code No.B16A8 Tail lamp (LH) circuit short <Short circuit in the position lamp (LH) circuit, tail lamp 
(LH) circuit or the licence plate lamp circuit>

CAUTION

• Before replacing the ECU, ensure that the 

power supply circuit, the earth circuit and the 
communication circuit are normal.

• When the ETACS-ECU of vehicles without 

KOS is replaced, the encrypted code of the 
ignition key needs to be registered to the 
ETACS-ECU. (If the encrypted code is not reg-
istered, the engine cannot be started. Regis-
ter the encrypted code as described in 
Immobilizer System 

− How to Register Key ID 

P.54A-33

.)

DIAGNOSTIC FUNCTION

When a short circuit is detected in the position lamp 
circuit, the tail lamp circuit or the licence plate lamp 
circuit, the ETACS-ECU sets the diagnosis code No. 
B16A8.

JUDGEMENT CRITERIA

The problem detection of tail lamp is made based on 
the digital feed back signal (input signal to 
ETACS-ECU) which operates the tail lamp. When the 
ignition switch is ON, the ETACS-ECU determines 
the tail lamp 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 diag-
nosis code No. B16A8 if no load is detected.

PROBABLE CAUSES

• Malfunction of bulbs

• Damaged harness wires and connectors

• Malfunction of the ETACS-ECU

DIAGNOSIS PROCEDURE

STEP 1. Bulb check
Check the bulb(s) of the lamp that does not illumi-
nate.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the bulb(s) of the lamp that does 
not illuminate.

STEP 2. Resistance measurement at the 
headlamp assembly (position: LH) connector, 
rear combination lamp (tail: LH) connector, 
licence plate lamp (LH) connector and licence 
plate lamp (RH) connector (earth terminals).
(1) Disconnect the connector, and measure at the 

wiring harness side.

(2) Measure the resistance between the connector 

terminal of lamp which does not illuminate and 
the body earth.

• Measure the resistance between the head-

lamp assembly (position: LH) connector 
(earth terminal) and body earth.

• Measure the resistance between the rear 

combination lamp (tail: LH) connector (earth 
terminal) and body earth.

• Measure the resistance between the licence 

plate lamp (LH) connector (earth terminal) 
and body earth.

• Measure the resistance between the licence 

plate lamp (RH) connector (earth terminal) 
and 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.

STEP 3. Check of open circuit in earth lines 
between the headlamp assembly (position: LH) 
connector , rear combination lamp (tail: LH) 
connector, licence plate lamp (LH) connector or 
licence plate lamp (RH) connector and body 
earth.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector(s) or wiring harness.

STEP 4. Check of short to power supply, short to 
earth, and open circuit in (TAL1, TAL2) lines 
between the headlamp assembly (position: LH) 
connector , rear combination lamp (tail: LH) 
connector, licence plate lamp (LH) connector or 
licence plate lamp (RH) connector and 
ETACS-ECU connector.

Q: Is the check result normal?

YES : 

Go to Step 5.

NO : 

Repair the connector(s) or wiring harness.

REAR COMBINATION LAMP

CHASSIS ELECTRICAL

54A-140

STEP 5. Check whether the diagnosis code is 
reset.
(1) Erase the diagnosis code.
(2) Turn the ignition switch from "LOCK" (OFF) 

position to "ON" position.

(3) Check if diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the ETACS-ECU.

NO : 

The diagnosis is complete.

TROUBLE SYMPTOM CHART

M1541401000500

Trouble symptom

Inspection 
Procedure No.

Reference page

None of the tail lamps illuminate.

1

P.54A-140

The stop lamps do not illuminate or go out normally.

2

P.54A-141

SYMPTOM PROCEDURES

Inspection Procedure 1: None of the tail lamps illuminate.

CAUTION

• Before replacing the ECU, ensure that the 

power supply circuit, the earth circuit and the 
communication circuit are normal.

• When the ETACS-ECU of vehicles without 

KOS is replaced, the encrypted code of the 
ignition key needs to be registered to the 
ETACS-ECU. (If the encrypted code is not reg-
istered, the engine cannot be started. Regis-
ter the encrypted code as described in 
Immobilizer System 

− How to Register Key ID 

P.54A-33

.)

COMMENTS ON TROUBLE SYMPTOM

If all the tail lamps do not illuminate normally, the tail 
lamp switch input circuit or ETACS-ECU may have a 
problem. 

PROBABLE CAUSES

• Malfunction of column switch

• Malfunction of the ETACS-ECU

• Damaged harness wires and connectors

DIAGNOSIS PROCEDURE

STEP 1. Licence plate lamp operation check
Check that the licence plate lamp illuminates nor-
mally.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Replace the ETACS-ECU.

STEP 2. M.U.T.-III diagnosis code
Check if diagnosis code is set to the ETACS-ECU.

Q: Is the diagnosis code set?

YES : 

Troubleshoot the ETACS-ECU. Refer to 

P.54A-281

.

NO : 

Go to Step 3.

STEP 3. M.U.T.-III data list
Use the ETACS-ECU service data to check the sig-
nals related to the tail lamp illumination.

•

Item No.

Item name

Normal 
condition

Item 340

Head lamp 
switch (tail)

ON

Turn the lighting switch to the "TAIL" position.

OK: Normal condition is displayed.

Q: Is the check result normal?

YES : 

Go to Step 4.

NO : 

Troubleshoot the ETACS-ECU. Refer to 
Inspection Procedure 11 "The column 
switch signal is not received" 

P.54A-321

.

STEP 4. Retest the system
Check that the tail lamp illuminates normally.

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 : 

Replace the ETACS-ECU.