Nissan Frontier. Manual - part 137

BRC-76

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

C1187 DIFFERENTIAL LOCK CONTROL UNIT

C1187 DIFFERENTIAL LOCK CONTROL UNIT

Description

INFOID:0000000009479332

The differential lock control unit is connected to the ABS actuator and electric unit (control unit) via CAN lines.

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000009479333

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

CHECK SELF-DIAGNOSIS RESULTS

Check the self-diagnosis results.

Is above displayed on the self-diagnosis display?

YES

>> Proceed to diagnosis procedure. Refer to 

BRC-76, "Diagnosis Procedure"

.

NO

>> Inspection End

Diagnosis Procedure

INFOID:0000000009479334

1.

CONNECTOR INSPECTION

1. Turn ignition switch OFF.

2. disconnect ABS actuator and electric unit (control unit) connector.

3. Check terminals for deformation, disconnection, looseness, and so on. If any malfunction is found, repair

or replace terminals.

4. Reconnect connector and perform self-diagnosis. Refer to 

BRC-29, "CONSULT Function (ABS)"

.

Is above displayed on the self-diagnosis display?

YES

>> Refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

NO

>> Inspection End

DTC

Display item

Malfunction detected condition

Possible cause

C1187

ABS DIFLOCK CONTROL-
LER NG

Differential lock controller malfunction.

• Harness or connector
• CAN communication line
• Differential lock control unit
• ABS actuator and electric unit 

(control unit)

Self-diagnosis results

ABS DIFLOCK CONTROLLER NG

Self-diagnosis results

ABS DIFLOCK CONTROLLER NG

U1000 CAN COMM CIRCUIT

BRC-77

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000009479335

CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul-

tiplex communication line with high data communication speed and excellent error detection ability. Many elec-

tronic control units are equipped onto a vehicle, and each control unit shares information and links with other

control units during operation (not independent). In CAN communication, control units are connected with 2

communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

DTC Logic

INFOID:0000000009479336

DTC DETECTION LOGIC

Diagnosis Procedure

INFOID:0000000009479337

1.

CONNECTOR INSPECTION

1. Turn ignition switch OFF.

2. Disconnect the ABS actuator and electric unit (control unit) connector.

3. Check terminals for deformation, disconnection, looseness, and so on. If any malfunction is found, repair

or replace terminals.

4. Reconnect connector and perform self-diagnosis. Refer to 

BRC-29, "CONSULT Function (ABS)"

.

Is “CAN COMM CIRCUIT” displayed in self-diagnosis display items?

YES

>> Print out the self-diagnostic results, and refer to 

LAN-14, "Trouble Diagnosis Flow Chart"

.

NO

>> Connector terminal is loose, damaged, open, or shorted.

DTC

Display item

Malfunction detected condition

Possible cause

U1000

CAN COMM CIRCUIT

When ABS actuator and electric unit (control unit) is not 
transmitting or receiving CAN communication signal for 2 
seconds or more.

• CAN communication line
• ABS actuator and electric unit 

(control unit)

BRC-78

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

VDC OFF SWITCH

VDC OFF SWITCH

Description

INFOID:0000000009479338

VDC OFF switch can deactivate (turn OFF) the VDC/TCS function by pressing the VDC OFF switch.

Component Function Check

INFOID:0000000009479339

1.

CHECK VDC OFF SWITCH OPERATION

Press and release the VDC OFF switch, then press and release the VDC OFF switch again and check that the

VDC OFF indicator lamp in the combination meter turns ON/OFF correctly.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Go to diagnosis procedure. Refer to 

BRC-78, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009479340

Regarding Wiring Diagram information, refer to 

BRC-92, "Wiring Diagram - VDC WITHOUT HILL DESCENT

CONTROL/HILL START ASSIST"

.

1.

CHECK VDC OFF SWITCH

Perform the VDC OFF switch component inspection. Refer to 

BRC-79, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2

NO

>> Replace VDC OFF switch.

2.

CHECK VDC OFF SWITCH HARNESS

1. Disconnect ABS actuator and electric unit (control unit) connector.

2. Check continuity between ABS actuator and electric unit (control unit) connector E127 (A) terminal 6 and

VDC OFF switch connector M154 (B) terminal 1.

3. Check continuity between ABS actuator and electric unit (control unit) connector E127 (A) terminal 6 and

ground.

Is the inspection result normal?

YES

>> GO TO 3

NO

>> Repair or replace harness.

3.

CHECK VDC OFF SWITCH GROUND

Condition

VDC OFF indicator lamp illumination status

VDC OFF switch: pressed and released

ON

VDC OFF switch: pressed and released

OFF

ABS actuator and electric unit 

(control unit)

VDC OFF switch

Continuity

Connector

Terminal

Connector

Terminal

E127 (A)

6

M154 (B)

1

Yes

ABS actuator and electric unit (control unit)

—

Continuity

Connector

Terminal

E127 (A)

6

Ground

No

VDC OFF SWITCH

BRC-79

< DTC/CIRCUIT DIAGNOSIS >

[TYPE 1]

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Check continuity between VDC OFF switch connector M154 and

ground.

Is the inspection result normal?

YES

>> GO TO 4

NO

>> Repair or replace harness.

4.

CHECK COMBINATION METER

Check if the indication and operation of combination meter are normal. Refer to 

MWI-25, "Diagnosis Descrip-

tion"

.

Is the inspection result normal?

YES

>> Replace ABS actuator and electric unit (control unit). Refer to 

BRC-115, "Removal and Installa-

tion"

.

NO

>> Replace combination meter. Refer to 

MWI-90, "Removal and Installation"

.

Component Inspection

INFOID:0000000009479341

1.

CHECK VDC OFF SWITCH

1. Turn ignition switch OFF.

2. Disconnect VDC OFF switch connector.

3. Check continuity between VDC OFF switch terminals.

Is the inspection result normal?

YES

>> Inspection End

NO

>> Replace VDC OFF switch.

Special Repair Requirement

INFOID:0000000009479342

1.

ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION

Always perform neutral position adjustment for the steering angle sensor when replacing the ABS actuator

and electric unit (control unit). Refer to 

BRC-12, "ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL

POSITION : Description"

.

>> GO TO 2

2.

CALIBRATION OF DECEL G SENSOR

Always perform calibration of decel G sensor when replacing the ABS actuator and electric unit (control unit).

Refer to 

BRC-13, "CALIBRATION OF DECEL G SENSOR : Description"

.

>> END

VDC OFF switch

—

Continuity

Connector

Terminal

M154

2

Ground

Yes

AWFIA0031ZZ

VDC OFF switch terminals

Condition

Continuity

1 

− 2

VDC OFF switch pressed.

Yes

VDC OFF switch released.

No