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Nissan Xterra. Manual - part 593

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRC-15

< SYSTEM DESCRIPTION >

SRC

Trouble Diagnosis without CONSULT

INFOID:0000000009482987

DIAGNOSTIC PROCEDURE 6

Inspect SRS Malfunction Using "AIR BAG" Warning Lamp—Diagnosis Mode

NOTE:

SRS will not enter Diagnosis mode if no malfunction is detected in User mode.
1. Turn ignition switch ON.
2. After “AIR BAG” warning lamp lights for 7 seconds, turn ignition switch OFF within 1 second.
3. Wait more than 3 seconds.
4. Repeat steps 1 to 3 two more times (3 times total).
5. Turn ignition switch ON.
SRS is now in Diagnosis mode. Refer to

SRC-51, "Trouble Diagnosis without CONSULT"

CONSULT Function (AIR BAG)

INFOID:0000000009482988

CONSULT can display each diagnostic item using the diagnostic test modes shown following.

Self-Diagnosis Function (Without CONSULT)

INFOID:0000000009482989

• The reading of these results is accomplished using one of two modes — “User mode” and “Diagnosis

mode”.

• After a malfunction is repaired, turn the ignition switch OFF for at least one second, then back ON. Diagnosis

mode returns to the User mode. At that time, the self-diagnostic result is cleared.

AIR BAG diagnostic mode

Description

SELF-DIAG [CURRENT]

A current Self-diagnosis result (also indicated by the number of warning lamp flashes in the Diagnosis
mode) is displayed on the CONSULT screen in real time. This refers to a malfunctioning part requiring
repairs.

SELF-DIAG [PAST]

Diagnosis results previously stored in the memory are displayed on the CONSULT screen. The stored
results will remain until memory erasing is executed.

TROUBLE DIAG RECORD

With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be dis-
played on the CONSULT screen.

ECU DISCRIMINATED NO.

Air bag diagnosis sensor unit ECU discriminated number (identification number) or part number is dis-
played. Air bag diagnosis sensor unit has individual ECU discriminated number (identification number)
or part number based on model and equipment.

PASSENGER AIR BAG

The STATUS (readiness) of the front passenger air bag module is displayed. The STATUS displayed
(ON/OFF) depends on the signals supplied to the occupant classification system control module and
air bag diagnosis sensor unit. Refer to

SRC-10, "Occupant Classification System (OCS)"

for more in-

formation.

SRC-16

< SYSTEM DESCRIPTION >

ON BOARD DIAGNOSTIC (OBD) SYSTEM

HOW TO CHANGE SELF-DIAGNOSIS MODE

DIAGNOSTIC PROCEDURE 3

Final Check of SRS Using CONSULT—Diagnosis Mode

1. Connect CONSULT.
2. If no DTC is detected on “SELF-DIAG [CURRENT]”, repair of SRS is completed. Go to step 3.

If any DTC is detected on “SELF-DIAG [CURRENT]”, the malfunctioning part has not been repaired com-

pletely or another malfunctioning part is being detected. Perform DIAGNOSTIC PROCEDURE 2. Refer to

SRC-13, "SRS Operation Check"

3. Touch “ERASE”.

NOTE:

Touch “ERASE” to clear the memory of the malfunction (“SELF-DIAG [PAST]”).

If the memory of the malfunction in “SELF-DIAG [PAST]” is not erased, the User mode shows the system

malfunction by the operation of the warning lamp even if the malfunction is repaired completely.

4. Touch “BACK” key of CONSULT. Touch “SELF-DIAG [PAST]”.
5. Check that no malfunction is detected on “SELF-DIAG [PAST]”.
6. Touch “BACK” key of CONSULT to return to User mode from Diagnosis mode.
7. Turn ignition switch OFF and then turn off and disconnect CONSULT.
8. Go to

SRC-13, "SRS Operation Check"

DIAGNOSTIC PROCEDURE 4

Check SRS Repair History

CONSIDER POSSIBILITY THAT SELF-DIAGNOSTIC RESULT WAS NOT ERASED AFTER REPAIR

Check repair history of the SRS.
Have any previous repairs been made to the SRS?

YES

>> Self-diagnostic result “SELF-DIAG [PAST]” (previously stored in the memory) might not be erased

after repair. Perform DIAGNOSTIC PROCEDURE 3. Refer to

SRC-15, "Self-Diagnosis Function

(Without CONSULT)"

>> Perform DIAGNOSTIC PROCEDURE 2. Refer to

SRC-13, "SRS Operation Check"

SHIA0183E

B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

SRC-17

< DTC/CIRCUIT DIAGNOSIS >

SRC

DTC/CIRCUIT DIAGNOSIS

B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

Description

INFOID:0000000009482990

DTC B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

The driver air bag module is dual stage and wired to the air bag diagnosis sensor unit through the spiral cable.

The air bag diagnosis sensor unit will monitor for opens and shorts in detected lines to the driver air bag mod-

ule including the spiral cable.

PART LOCATION

Refer to

SRC-7, "SRS Component Parts Location"

DTC Logic

INFOID:0000000009482991

DTC DETECTION LOGIC

With CONSULT

DTC CONFIRMATION PROCEDURE (With CONSULT)

CHECK SELF-DIAG RESULT

1. Turn ignition switch ON.

2. Check for DTC using CONSULT.
Is the DTC detected?

YES (Current DTC)>>Refer to

SRC-18, "Diagnosis Procedure"

YES (Past DTC)>>GO TO 2.

>> Inspection End.

ERASE SELF-DIAG RESULT

Erase the DTC using CONSULT.
Can the DTC be erased?

CONSULT name

DTC

DTC detecting condition

Repair order

DRIVER AIRBAG MODULE

[OPEN]

B1049

Driver air bag module circuit (DR1) is open
(including the spiral cable).

Visually check the wiring harness connection.

Replace the harness if it has visible damage.

Inspect the spiral cable circuit.

Replace the air bag diagnosis sensor unit.

Replace the driver air bag module.

Replace the related harness.

B1054

Driver air bag module circuit (DR2) is open
(including the spiral cable).

DRIVER AIRBAG MODULE

[VB-SHORT]

B1050

Driver air bag module circuit (DR1) is
shorted to a power supply circuit
(including the spiral cable).

B1055

Driver air bag module circuit (DR2) is
shorted to a power supply circuit
(including the spiral cable).

DRIVER AIRBAG MODULE

[GND-SHORT]

B1051

Driver air bag module circuit (DR1) is
shorted to ground
(including the spiral cable).

B1056

Driver air bag module circuit (DR2) is
shorted to ground
(including the spiral cable).

DRIVER AIRBAG MODULE

[SHORT]

B1052

Driver air bag module circuits (DR1) are
shorted to each other
(including the spiral cable).

B1057

Driver air bag module circuits (DR2) are
shorted to each other
(including the spiral cable).

SRC-18

< DTC/CIRCUIT DIAGNOSIS >

B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

YES

>> Inspection End.

>> Refer to

SRC-18, "Diagnosis Procedure"

DTC CONFIRMATION PROCEDURE (Without CONSULT)

CHECK SELF-DIAG RESULT

1. Turn ignition switch ON.

2. Check the air bag warning lamp status. Refer to

SRC-15, "Self-Diagnosis Function (Without CONSULT)"

NOTE:

SRS will not enter diagnosis mode if no malfunction is detected in user mode.
Is the DTC detected?

YES

>> Refer to

SRC-18, "Diagnosis Procedure"

>> Inspection End.

Diagnosis Procedure

INFOID:0000000009482992

HARNESS CONNECTOR

Visually inspect all applicable harness connectors for the following:

• Visible damage to connector or terminal

• Loose terminal

• Poor connection
Is the inspection result normal?

YES

>> GO TO 2

>> Perform one of the following repairs:

• Visible damage: Replace the harness.

• Loose terminal: Secure the terminal.

• Poor connection: Secure the connection.

CONFIRM DTC

1. Reconnect all harness connectors.

2. Turn ignition switch ON.

3. Check for DTC using CONSULT.
Is DTC still current?

YES

>> GO TO 3

>> Refer to

GI-40, "Intermittent Incident"

WIRING HARNESS

Check the wiring harness for visible damage.

NOTE:

The entire wiring harness should be inspected from the air bag diagnosis sensor unit to the end component

(including any in-line connectors).
Is the inspection result normal?

YES

>> GO TO 4

>> Replace the harness.

CHECK SPIRAL CABLE CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect driver air bag module harness connectors and spiral cable harness connector.

3. Check continuity between driver air bag module harness connector and spiral cable connector.

4. Check continuity between driver air bag module harness connector and ground.

Driver air bag module

Spiral cable

Continuity

Connector

Terminal

Connector

Terminal

M101

M29

Yes

M103

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