Nissan Versa Note. Manual - part 756

B142A IGNITION VOLTAGE

SRC-87

< DTC/CIRCUIT DIAGNOSIS >

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B142A IGNITION VOLTAGE

Description

INFOID:0000000009761217

DTC B142A IGNITION VOLTAGE

Ignition voltage is supplied to the air bag diagnosis sensor unit when the ignition is in the ON position.  The air

bag diagnosis sensor unit will monitor for low or high ignition voltage.

PART LOCATION

Refer to 

SRC-5, "Component Parts Location"

.

DTC Logic

INFOID:0000000009761218

DTC DETECTION LOGIC 

With CONSULT

DTC CONFIRMATION PROCEDURE (With CONSULT)

1.

INSPECTION START

Turn ignition switch ON.

>> GO TO 2.

2.

CHECK SELF-DIAG RESULT

Check for the DTC on CONSULT.
Is the DTC detected?

YES

>> Refer to 

SRC-87, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009761219

NOTE:

Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is

eliminated using air bag warning lamp each time repair is finished. If malfunction is still observed, proceed to

the next step. When malfunction is eliminated, further repair work is not required.

1.

HARNESS CONNECTOR

Is there any visible damage to the connector?
YES or NO

YES

>> Replace the harness.

NO

>> GO TO 2

2.

WIRING HARNESS

Is there any visible damage to the harness?
YES or NO

YES

>> Replace the harness.

NO

>> GO TO 3

3.

AIR BAG DIAGNOSIS SENSOR UNIT

CONSULT name

DTC

DTC detecting condition

Repair order

IGN VOLTAGE

[LOW]

B142A

Ignition voltage low at air bag diagnosis sensor unit. Refer to 

SRC-87, "Diagnosis Procedure"

.

IGN VOLTAGE

[HIGH]

Ignition voltage high at air bag diagnosis sensor unit.

SRC-88

< DTC/CIRCUIT DIAGNOSIS >

B142A IGNITION VOLTAGE

Replace the air bag diagnosis sensor unit.  Refer to 

SR-29, "Removal and Installation"

.

>> GO TO 4

4.

RELATED HARNESS

Replace the related harness.

>> END

U1000 CAN COMM CIRCUIT

SRC-89

< DTC/CIRCUIT DIAGNOSIS >

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U1000 CAN COMM CIRCUIT

Description

INFOID:0000000009761220

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

multiplex communication system with high data communication speed and excellent error detection ability.

Many electronic control units are equipped into vehicles, and each control unit shares information and links

with other control units during operation. With CAN communication, control units are connected with two com-

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

Each control unit transmits and receives data but selectively reads required data only. Refer to 

LAN-29, "CAN

COMMUNICATION SYSTEM : CAN Communication Signal Chart"

.

DTC Logic

INFOID:0000000009761221

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM SELF-DIAGNOSIS

1. Turn ignition switch ON and wait for 7 seconds or more. 

2. Using CONSULT, perform SELF-DIAGNOSIS RESULTS of AIR BAG. 

3. Check if any DTC is displayed in the self-diagnosis results. 
Is DTC detected?

YES

>> Refer to 

SRC-89, "Diagnosis Procedure"

. 

NO

>> Refer to 

GI-41, "Intermittent Incident"

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Diagnosis Procedure

INFOID:0000000009761222

1.

CHECK CAN COMMUNICATION SYSTEM

Check CAN communication system. Refer to 

LAN-15, "Trouble Diagnosis Flow Chart"

.

>> Inspection End.

CONSULT name

DTC

DTC detecting condition

Repair order

CAN COMMUNICATION FAILURE

U1000

When air bag diagnosis sensor unit is not 
transmitting or receiving CAN communi-
cation signals for 2 or more seconds.

Refer to 

SRC-89, "Diagnosis 

Procedure"

. 

SRC-90

< DTC/CIRCUIT DIAGNOSIS >

U1010 CONTROL UNIT (CAN)

U1010 CONTROL UNIT (CAN)

Description

INFOID:0000000009761223

Air bag diagnosis sensor performs self-tests on key ON.  If CAN communication failure within control unit is

detected, DTC is set.

DTC Logic

INFOID:0000000009761224

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PERFORM SELF-DIAGNOSIS

1. Turn ignition switch ON. 

2. Using CONSULT, perform SELF DIAGNOSIS RESULTS of AIR BAG.

3. Check if DTC is displayed in the self-diagnosis results. 
Is DTC detected?

YES

>> Refer to 

SRC-90, "Diagnosis Procedure"

.

NO

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009761225

1.

REPLACE AIR BAG DIAGNOSIS SENSOR UNIT

Replace air bag diagnosis sensor unit. Refer to 

SR-29, "Removal and Installation"

.

>> Inspection End.

CONSULT name

DTC

DTC detecting condition

Repair order

CAN CONTROL UNIT FAILURE

U1010

CAN communication error is detected in 
control unit.

Refer to 

SRC-90, "Diagnosis 

Procedure"

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