Nissan Titan. Manual - part 550

ON BOARD DIAGNOSTIC (OBD) SYSTEM

SRC-15

< SYSTEM DESCRIPTION >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

Trouble Diagnosis without CONSULT

INFOID:0000000009882874

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-15, "Trouble Diagnosis without CONSULT"

.

CONSULT Function (AIR BAG)

INFOID:0000000009882875

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

Self-Diagnosis Function (Without CONSULT)

INFOID:0000000009882876

• 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

1.

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)"

.

No

>> Perform DIAGNOSTIC PROCEDURE 2.  Refer to 

SRC-13, "SRS Operation Check"

.

SHIA0183E

B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

SRC-17

< DTC/CIRCUIT DIAGNOSIS >

C

D

E

F

G

I

J

K

L

M

A

B

SRC

N

O

P

DTC/CIRCUIT DIAGNOSIS

B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

Description

INFOID:0000000009882877

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:0000000009882878

DTC DETECTION LOGIC 

With CONSULT

Without CONSULT

DTC CONFIRMATION PROCEDURE (With CONSULT)

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).

1.

Visually check the wiring harness connection.

2.

Replace the harness if it has visible damage.

3.

Inspect the spiral cable circuit.

4.

Replace the air bag diagnosis sensor unit.

5.

Replace the driver air bag module.

6.

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).

AWHIA0306GB

SRC-18

< DTC/CIRCUIT DIAGNOSIS >

B1049 – B1052, B1054 – B1057 DRIVER AIRBAG MODULE

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-18, "Diagnosis Procedure (Component Diagnosis)"

.

NO

>> Inspection End.

DTC CONFIRMATION PROCEDURE (Without CONSULT)

NOTE:

SRS will not enter diagnosis mode if no malfunction is detected in user mode.

1.

IGNITION SWITCH

Turn ignition switch ON.

>> GO TO 2

2.

IGNITION SWITCH

After air bag warning lamp lights for 7 seconds, turn ignition switch OFF within 1 second.

>> GO TO 3

3.

WAIT TIME

Wait more than 3 seconds.

>> GO TO 4

4.

REPEAT STEPS

Repeat steps 1 to 3 twice.

>> GO TO 5.

5.

IGNITION SWITCH

Turn ignition switch ON.

>> GO TO 6.

6.

DIAGNOSTIC MODE

SRS system is now in diagnostic mode and AIR BAG warning lamp flashes. Refer to 

SRC-62, "Trouble Diag-

nosis without CONSULT"

.

>> END

Diagnosis Procedure (Component Diagnosis)

INFOID:0000000009882879

Recheck SRS after each replacement.

1.

HARNESS CONNECTOR

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

YES

>> Replace the harness.

NO

>> GO TO 2