Nissan X-Trail 32. Manual - part 687

P1811 BATTERY VOLTAGE

DLN-159

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY30A]

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Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK 4WD CONTROL UNIT POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#30).

3.

Disconnect fuse block (J/B) harness connector.

4.

Check the continuity between 4WD control unit harness connector and fuse block (J/B) harness connec-
tor.

5.

Check the continuity between 4WD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for ignition power supply circuit. Refer to 

PG-52, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK 4WD CONTROL UNIT POWER SUPPLY (3)

1.

Turn the ignition switch OFF.

2.

Check the voltage between 4WD control unit harness connector and ground.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between 4WD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK 4WD CONTROL UNIT POWER SUPPLY (4)

1.

Turn the ignition switch OFF.

2.

Check the 5A fuse (#2).

3.

Disconnect fuse block (J/B) harness connector.

4.

Check the continuity between 4WD control unit harness connector and fuse block (J/B) harness connec-
tor.

4WD control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

B5

7

M3

7C

Existed

4WD control unit

—

Continuity

Connector

Terminal

B5

7

Ground

Not existed

4WD control unit

—

Voltage (Approx.)

Connector

Terminal

B5

15

Ground

Battery voltage

4WD control unit

—

Voltage 

Connector

Terminal

B5

15

Ground

Battery voltage

4WD control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

B5

15

B107

6H

Existed

DLN-160

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY30A]

P1811 BATTERY VOLTAGE

5.

Check the continuity between 4WD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit. Refer to 

PG-12, "Wiring Diagram - BAT-

TERY POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

5.

CHECK 4WD CONTROL UNIT GROUND

1.

Turn the ignition switch OFF.

2.

Check the continuity between 4WD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

CHECK TERMINALS AND HARNESS CONNECTORS

Check 4WD control unit pin terminals for damage or loose connection with harness connector.

Is the inspection result normal?

YES

>> After turning the ignition switch OFF, perform DTC confirmation procedure again. When DTC

“P1811” is detected, Replace 4WD control unit. Refer to 

DLN-179, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

4WD control unit

—

Continuity

Connector

Terminal

B5

15

Ground

Not existed

4WD control unit

—

Continuity

Connector

Terminal

B5

10

Ground

Existed

11

P181B INCOMPLETE SELFSHUT

DLN-161

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY30A]

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P181B INCOMPLETE SELFSHUT

DTC Description

INFOID:0000000011004017

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Malfunction of 4WD control unit power supply circuit (open or short)
• Battery power supply
• Ignition power supply
• Internal malfunction of 4WD control unit

FAIL-SAFE

No impact to vehicle behavior.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If “DTC CONFIRMATION PROCEDURE” has been previously conducted, always turn ignition switch OFF and
wait at least 10 seconds before conducting the next test.

>> GO TO 2.

2.

DTC REPRODUCTION PROCEDURE

With CONSULT

1.

Turn the ignition switch ON.

2.

Perform self-diagnosis for “ALL MODE AWD/4WD”.

Is DTC “P181B” detected?

YES

>> Proceed to diagnosis procedure. Refer to 

DLN-161, "Diagnosis Procedure"

.

NO-1

>> To check malfunction symptom before repair: Refer to 

GI-44, "Intermittent Incident"

.

NO-2

>> Confirmation after repair: INSPECTION END

Diagnosis Procedure

INFOID:0000000011004018

1.

CHECK 4WD CONTROL UNIT POWER SUPPLY (1)

1.

Turn the ignition switch OFF.

2.

Disconnect 4WD control unit harness connector.

3.

Check the voltage between 4WD control unit harness connector and ground.

4.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

5.

Check the voltage between 4WD control unit harness connector and ground.

Is the inspection result normal?

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P181B

INCOMP SELF SHUT
(Incomplete self shut)

When ignition switch is ON, self-shut of 4WD control unit 
was incomplete.

4WD control unit

—

Voltage (Approx.)

Connector

Terminal

B5

7

Ground

0 V

4WD control unit

—

Voltage 

Connector

Terminal

B5

7

Ground

Battery voltage

DLN-162

< DTC/CIRCUIT DIAGNOSIS >

[TRANSFER: TY30A]

P181B INCOMPLETE SELFSHUT

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK 4WD CONTROL UNIT POWER SUPPLY (2)

1.

Turn the ignition switch OFF.

2.

Check the 10A fuse (#30).

3.

Disconnect fuse block (J/B) harness connector.

4.

Check the continuity between 4WD control unit harness connector and fuse block (J/B) harness connec-
tor.

5.

Check the continuity between 4WD control unit harness connector and the ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for ignition power supply circuit. Refer to 

PG-52, "Wiring Diagram -

IGNITION POWER SUPPLY -"

.

NO

>> Repair or replace error-detected parts.

3.

CHECK 4WD CONTROL UNIT POWER SUPPLY (3)

1.

Turn the ignition switch OFF.

2.

Check the voltage between 4WD control unit harness connector and ground.

3.

Turn the ignition switch ON.

CAUTION:

Never start the engine.

4.

Check the voltage between 4WD control unit harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 4.

4.

CHECK 4WD CONTROL UNIT POWER SUPPLY (4)

1.

Turn the ignition switch OFF.

2.

Check the 5A fuse (#2).

3.

Disconnect fuse block (J/B) harness connector.

4.

Check the continuity between 4WD control unit harness connector and fuse block (J/B) harness connec-
tor.

5.

Check the continuity between 4WD control unit harness connector and the ground.

4WD control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

B5

7

M3

7C

Existed

4WD control unit

—

Continuity

Connector

Terminal

B5

7

Ground

Not existed

4WD control unit

—

Voltage (Approx.)

Connector

Terminal

B5

15

Ground

Battery voltage

4WD control unit

—

Voltage 

Connector

Terminal

B5

15

Ground

Battery voltage

4WD control unit

Fuse block (J/B)

Continuity

Connector

Terminal

Connector

Terminal

B5

15

B107

6H

Existed