Nissan Sentra manuals

Nissan Sentra Service Manual: Diagnosis system (AIR BAG)

Description

CAUTION:

DIAGNOSIS FUNCTION

On Board Diagnosis Function


On Board Diagnosis Function

ON-BOARD DIAGNOSIS

There are two self diagnosis functions with air bag warning lamp per the following items.

METHOD OF STARTING

Procedure to Change Diagnosis Mode

  1. Turn ignition switch from OFF to ON.
  2. SRS air bag lamp turns ON for 7 second and turns OFF, then turn ignition switch OFF within 2 second after the lamp turns OFF.

NOTE:

When in Diagnosis Mode, the air bag warning lamp may illuminate for more than 7 seconds after the ignition switch is turned ON. If this is the case, the ignition switch must still be cycled OFF after 7 seconds.

  1. After turning ignition switch OFF, wait for 3 seconds or more.
  2. Repeat operation 1 to 3 for 2 times so that operation 1 to 3 is repeated for 3 times in total.
  3. Turn ignition switch from OFF to ON. Diagnosis mode changes.

USER MODE

In USER MODE, air bag warning lamp on combination meter turning ON when a malfunction is detected and warns the customer (driver).

How to Read Air Bag Warning Lamp

  1. Turn the ignition switch from OFF to ON, and check that the air bag warning lamp turns ON.
  2. Compare the air bag warning lamp operation pattern with the examples.

Air Bag Warning Lamp Examples:

Air bag warning lamp flashing pattern (User Mode)

Trouble Diagnosis with CONSULT


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:

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-23, "Flash Code Index".

SRS History Check

SRS HISTORY CHECK

  1. Check repair history of the SRS. If no repairs have been made, perform SRC-15, "On Board Diagnosis Function". If repairs have been made, GO TO step 2.
  2. Erase ”SELF-DIAG [PAST]” after repair. Refer to SRC-17, "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- 15, "On Board Diagnosis Function".

  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.

  1. Check that no malfunction is detected in “SELF-DIAG [PAST]”.
  2. Exit Diagnosis Mode and disconnect the CONSULT
  3. Perform SRS Operation Check. Refer to SRC-15, "On Board Diagnosis Function".

CONSULT Function (AIR BAG)

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

Diagnostic Test Mode

Diagnostic Item

Description

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.
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 Diagnostic Record TROUBLE DIAG RECORD [PAST] With TROUBLE DIAG RECORD, diagnosis results previously erased by a reset operation can be displayed on the CONSULT screen.

CONSULT Function (OCCUPANT DETECTION)

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

Diagnostic Test Mode

Diagnostic Item

Description

Work Support ZERO POINT RESET FUNCTION Perform zero point reset. Refer to SRC-41, "ZERO POINT RESET : Special Repair Requirement".
System
SRS air bag system SRS AIR BAG SYSTEM : System Diagram SRS AIR BAG SYSTEM : System Description The air bag deploys if the air bag diagnosis sensor unit is activated while the ignition swi ...

ECU diagnosis information
Diagnosis sensor unit DTC Index DIAGNOSTIC CODE CHART NOTE: Follow the procedures in numerical order when repairing malfunctioning parts. Confirm whether malfunction is eliminated using air bag ...

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