Nissan Versa (N17): 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

1. Obtain information about the symptom.

• WHAT - vehicle model
• WHEN - date, frequencies
• WHERE - road conditions
• HOW - operating conditions, symptoms, passengers

2. Perform Preliminary Check.

• Battery
• Fuses
• Harness connections

DIAGNOSIS METHODS

SRS self-diagnosis results 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 the AIR BAG warning lamp.

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

SRS Operation Check

USER MODE

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

Air bag warning lamp flashing pattern (User Mode)

Trouble Diagnosis with CONSULT

1. Connect CONSULT.
2. DTC is displayed on SELF-DIAG RESULTS.

NOTE: If a malfunction is not detected on SELF-DIAG RESULTS [CURRENT], but a malfunction is detected during

SRS Operation Check, the following cases may exist:

• SELF-DIAG [PAST] memory might not be erased. Refer to SRC "SRS Final Check".
• SRS system malfunctions intermittently. Refer to SRC "Inspection Procedure".

Trouble Diagnosis without CONSULT

DIAGNOSIS MODE

NOTE: Diagnosis Mode can not be entered if a malfunction is not 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 "Flash Code Index".

SRS History Check

SRS HISTORY CHECK

1. Check repair history of the SRS. If no repairs have been made perform SRC "SRS Operation Check".

   If repairs have been made GO TO step 2.

2. Erase "SELF-DIAG [PAST]" after repair. Refer to SRC "SRS Final Check".

SRS Final Check

DIAGNOSIS MODE

1. Connect CONSULT.
2. Confirm that zero point reset of OCS is complete.
3. If no DTCs are detected on "SELF-DIAG RESULTS [CURRENT]", repair of SRS is completed. Go to step 4.

   If any DTCs are detected on "SELF-DIAG RESULTS [CURRENT]", the malfunction has not been repaired completely or another malfunction is being detected. Perform SRS Operation Check again. Refer to SRC "SRS Operation Check".

4. Touch "ERASE".

   NOTE: Touching "ERASE" will clear the SRS memory of the malfunction ("SELF-DIAG [PAST]"). If "SELFDIAG [PAST]" is not erased, User Mode may show the previous system malfunction even if the malfunction has been repaired completely.

5. Check that no malfunction is detected in "SELF-DIAG [PAST]".
6. Exit Diagnosis Mode and disconnect the CONSULT.
7. Perform SRS Operation Check. Refer to SRC "SRS Operation Check".

CONSULT Function (AIR BAG)

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

Diagnostic Test Mode	Diagnostic Item	Description
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.
Self Diagnostic Result	SELF-DIAG RESULT [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.
Work Support	ZERO POINT RESET FUNCTION	Perform zero point reset. Refer to SRC "ZERO POINT RESET : Special Repair Requirement".
Function Test	CAR COMPUTER DIAG.	System wide test results are
Special function	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 displayed on the CONSULT screen.
	SELF-DIAG RESULT [CAN]	A current Self-diagnosis result [CAN] is displayed on the CONSULT screen in real time. Self-diagnosis result [CAN] can not be erased.
	CAUSE OF WARNING	FUNCTION STATUS - "ON or "STOP is displayed according to OCS status recognized by OCS control unit. STOP DETECTION - Displays number of times OCS STOP condition has been detected. DETECTION RECORD - Displays number of times IGN ON has been detected since first STOP detection occurred.

ECU DIAGNOSIS INFORMATION