Nissan Murano: Srs Air Bag Control System :: System Description / Diagnosis System (air Bag)

Nissan Murano (Z52) 2015-2024 Service Manual / Restraints / Srs Air Bag Control System :: System Description / Diagnosis System (air Bag)

Diagnosis Description

CAUTION:

Do not use electrical test equipment on any circuit related to the SRS unless instructed to do so in this Service Manual. SRS wiring harnesses can be identified by yellow and/or orange harness connectors.

Do not attempt to repair, splice or modify SRS wiring harnesses. If a harness is damaged, replace it with a new one.

Keep ground connections clean.

HOW TO PERFORM TROUBLE DIAGNOSES FOR QUICK AND ACCURATE REPAIR

Obtain information about the symptom.
- WHAT - vehicle model
- WHEN - date, frequencies
- WHERE - road conditions
- HOW - operating conditions, symptoms, passengers
Perform Preliminary Check.
- Battery
- Fuses
- Harness connections

DIAGNOSIS METHODS

SRS “Self Diagnostic Result” can be read by using the AIR BAG warning lamp or CONSULT.

The User Mode is for the customer (driver). This mode warns the driver of a system malfunction through the AIR BAG warning lamp.

The Diagnosis Mode is for the technician. This mode helps the technician locate the malfunctioning circuit or part.

Diagnosis tool	User Mode	Diagnosis Mode	Display type
AIR BAG warning lamp	X	X	ON/OFF
CONSULT	—	X	Monitoring

SRS Operation Check

USER MODE

Place the ignition switch from OFF to ON and check that the air bag warning lamp blinks.
Compare the blinking pattern with the examples in the table.

Air bag warning lamp flashing pattern (User Mode)
Warning lamp	SRS condition	Reference item
	No malfunction is detected. No further action is necessary.	—
	Air bag is deployed. Seat belt pre-tensioner is deployed.	Refer to For Frontal Collision or For Side and Rollover Collision.
	Air bag diagnosis sensor unit is malfunctioning. Air bag power supply circuit is malfunctioning. SRS air bag warning lamp circuit is malfunctioning.	Refer to Air Bag Warning Lamp Does Not Turn Off.
	Air bag diagnosis sensor unit is malfunctioning. Air bag warning lamp circuit is malfunctioning.	Refer to Air Bag Warning Lamp Does Not Turn On.

Trouble Diagnosis

CONSULT

DTC is displayed on “Self Diagnostic Result”.

NOTE:

If a malfunction is not detected on “Self Diagnostic Result [CURRENT]”, but a malfunction is detected during SRS Operation Check, the following cases may exist:

“Self Diagnostic Result [PAST]” memory might not be erased. Refer to SRS Final Check.
SRS system malfunctions intermittently. Refer to Inspection Procedure.

SRS History Check

SRS HISTORY CHECK

Check repair history of the SRS. If no repairs have been made, perform SRS Operation Check. If repairs have been made, GO TO step 2.
Erase “Self Diagnostic Result [PAST]” after repair. Refer to SRS Final Check.

SRS Final Check

DIAGNOSIS MODE

CONSULT

Confirm that zero point reset of OCS is complete.
If no DTCs are detected on “Self Diagnostic Result [CURRENT]”, repair of SRS is completed. Go to step 3.

If any DTCs are detected on “Self Diagnostic Result [CURRENT]”, the malfunction has not been repaired completely or another malfunction is being detected. Perform SRS Operation Check again. Refer to SRS Operation Check.
Select “ERASE”.

NOTE:
Selecting “ERASE” will clear the SRS memory of the malfunction (“Self Diagnostic Result [PAST]”). If “Self Diagnostic Result [PAST]” is not erased, User Mode may show the previous system malfunction even if the malfunction has been repaired completely.
Check that no malfunction is detected in “Self Diagnostic Result [PAST]”.
Exit Diagnosis Mode and disconnect the CONSULT.
Perform SRS Operation Check. Refer to SRS Operation Check.

CONSULT Function (AIR BAG)

CAUTION:

After disconnecting the CONSULT vehicle interface (VI) from the data link connector, the ignition must be cycled OFF → ON (for at least 5 seconds) → OFF. If this step is not performed, the BCM may not go to ”sleep mode”, potentially causing a discharged battery and no-start condition.

APPLICATION ITEMS

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

Diagnostic Test Mode	Diagnostic Item	Description
Self Diagnostic Result	SELF DIAGNOSTIC RESULT [CURRENT]	A current “Self Diagnostic 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.
Data Monitor	DATA MONITOR	Displays air bag diagnosis sensor unit input/output data in real time.
ECU Identification	ECU DISCRIMINATED NO.	Air bag diagnosis sensor unit ECU discriminated number (identification number) or part number is displayed. Air bag diagnosis sensor unit has individual ECU discriminated number (identification number) or part number based on model and equipment.
TROUBLE DIAG RECORD	TROUBLE DIAG RECORD [PAST]	With “TROUBLE DIAG RECORD”, diagnosis results previously erased by a reset operation can be displayed on the CONSULT screen.
Configuration	CONFIGURATION	The Nissan Murano vehicle specification can be read and saved. The vehicle specification can be written when replacing BCM and air bag diagnosis sensor unit.

CONSULT Function (OCCUPANT DETECTION)

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

NOTE:

The following table includes information (items) inapplicable to this Nissan Murano vehicle. For information (items) applicable to this vehicle, refer to CONSULT display items.

Diagnostic Test Mode	Diagnostic Item	Description
Work support	Zero point reset function	Perform zero point reset. Refer to Special Repair Requirement.
Data Monitor	Buckle Switch Status (Comm) [Not Moni/Moni(wir)/Frm ACU]	Displays the status of the seat belt buckle switch (passenger side) signal. Not Moni: Seat belt buckle switch (passenger side) is not monitored. Moni (wir): The switch status input from seat belt buckle switch (passenger side). Frm ACU: The switch status input from air bag diagnosis sensor unit.
	Buckle Switch Spec [Not Moni/Nor Op/Nor Cl/ Frm ACU]	Displays the spec of the seat belt buckle switch (passenger side). Not Moni: Seat belt buckle switch (passenger side) is not monitored. Nor Cl: Seat belt buckle switch (passenger side) is normal close type. Nor Cl: Seat belt buckle switch (passenger side) is normal close type. Frm ACU: Occupant detection system control unit receives seat belt buckle switch (passenger side) signal from air bag diagnosis sensor unit.
	Buckle Switch Status [Not Moni/Unfasten/ Fasten/Reload]	The switch status input from seat belt buckle switch (passenger side). Not Moni: Seat belt buckle switch (passenger side) is not monitored. Unfasten: Seat belt buckle switch (passenger side) is unfasten. Fasten: Seat belt buckle switch (passenger side) is fasten. Reload: The seat belt buckle switch (passenger side) state is loading.

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