Precaution for Supplemental Restraint System (SRS) "AIR BAG" and "SEAT BELT PRE-TENSIONER"
The Supplemental Restraint System such as "AIR BAG" and "SEAT BELT PRE-TENSIONER", used along with a front seat belt, helps to reduce the risk or severity of injury to the driver and front passenger for certain types of collision. This system includes seat belt switch inputs and dual stage front air bag modules. The SRS system uses the seat belt switches to determine the front air bag deployment, and may only deploy one front air bag, depending on the severity of a collision and whether the front occupants are buckled or unbuckled.
Information necessary to service the system safely is included in the SRS AIRBAG and SEAT BELTS of this Service Information.
| WARNING | Always observe the following items for preventing accidental activation. To avoid rendering the SRS inoperative, which could increase the risk of personal injury or death in the event of a collision that would result in air bag inflation, all maintenance must be performed by an authorized NISSAN/INFINITI dealer. Improper maintenance, including incorrect removal and installation of the SRS, can lead to personal injury caused by unintentional activation of the system. For removal of Spiral Cable and Air Bag Module, see " SRS AIRBAG ". Never use electrical test equipment on any circuit related to the SRS unless instructed to in this Service Information. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. |
PRECAUTIONS WHEN USING POWER TOOLS (AIR OR ELECTRIC) AND HAMMERS
| WARNING | Always observe the following items for preventing accidental activation. When working near the Air Bag Diagnosis Sensor Unit or other Air Bag System sensors with the ignition ON or engine running, never use air or electric power tools or strike near the sensor(s) with a hammer. Heavy vibration could activate the sensor(s) and deploy the air bag(s), possibly causing serious injury. When using air or electric power tools or hammers, always switch the ignition OFF, disconnect the battery, and wait at least 3 minutes before performing any service. |
Service
- Never use electrical test equipment to check SRS circuits unless instructed to in this Service Information.
- Before servicing the SRS, turn ignition switch OFF, disconnect battery negative terminal and wait 3 minutes or more. For approximately 3 minutes after the cables are removed, it is still possible for the air bag and seat belt pretensioner to deploy. Therefore, never work on any SRS connectors or wires until at least 3 minutes have passed.
- Diagnosis sensor unit must always be installed with their arrow marks "<==" pointing towards the front of the vehicle for proper operation. Also check diagnosis sensor unit for cracks, deformities or rust before installation and replace as required.
- The spiral cable must be aligned with the neutral position since its rotations are limited. Never turn steering wheel and column after removal of steering gear.
- Handle air bag module carefully. Always place driver and front passenger air bag modules with the pad side facing upward and seat mounted front side air bag module standing with the stud bolt side facing down.
- Conduct self-diagnosis to check entire SRS for proper function after replacing any components.
- After air bag inflates, the front instrument panel assembly should be replaced if damaged.
- Always replace instrument panel pad following front passenger air bag deployment.
Scheme 12
COLLISION MODES
The operation of SRS is different depending on the collision modes applications. For example, the driver air bag module, passenger air bag module, and seat belt pre-tensioner are activated in a frontal collision or side collision.
SRS configurations that are activated for the following collision modes.
| X: Apply -: Not apply | |||
|---|---|---|---|
| SRS configuration | Frontal collision | Left side collision | Right side collision |
| Driver air bag module | X | ||
| Passenger air bag module | X | ||
| Seat belt pre-tensioner LH | X | X | |
| Seat belt pre-tensioner RH | X | X | |
| Side air bag module LH | X | ||
| Side air bag module RH | X | ||
| Curtain air bag module LH | X | ||
| Curtain air bag module RH | X | ||
OCCUPANT DETECTION SYSTEM
This Occupant Detection System has the following functions.
- Suppress the deployment of front passenger air bag when front passenger seat is empty, or when occupied by child and child-seat. Turns ON front passenger air bag OFF indicator when front passenger seat is occupied by child-seat and child.
- Indicates malfunction portion with blinking times of air bag warning lamp in diagnosis mode.
- Indicates the malfunctioning record by CONSULT.
- When "zero point reset" for occupant detection system is incomplete, CONSULT indicates that "zero point reset" is incomplete. This function is applied to NISSAN genuine parts only. NOTE: Operation of air bag diagnosis sensor unit when air bag diagnosis sensor unit receives information from Occupant Detection System. Even if zero point reset is "complete", always perform zero point reset after the removal and installation of seat or the removal of control unit harness connector.
| Status (front passenger seat) | Passenger air bag | Front passenger air bag OFF indicator | Air bag warning lamp | Seat belt warning lamp (when front passenger seat is unbuckled) |
|---|---|---|---|---|
| Empty | Suppress | OFF | OFF | OFF |
| An object | Suppress | ON | OFF | OFF |
| Child/child-seat | Suppress | ON | OFF | ON |
| Adult | Enable to deploy | OFF | OFF | ON |
| Malfunction | Suppress | ON | Blinking | OFF |
| Zero point reset Not yet performed (NISSAN genuine parts only) | Suppress | ON | Blinking | OFF |
METHOD OF STARTING
- Diagnosis mode changes from user mode to diagnosis mode when changing operation is performed.
- In user mode, when SRS air bag warning lamp is not blinking, changing to diagnosis mode by ignition switch operation is not possible.
- In diagnosis mode, when repair is complete and system is normal, the mode changes to user mode when ignition switch is turned from OFF to ON.
USER MODE
In USER MODE, air bag warning lamp on combination meter blinks when a malfunction is detected and warns the customer (driver).
How to Read Air Bag Warning Lamp
- Turn the ignition switch from OFF to ON, and check that the air bag warning lamp blinks.
- Compare the air bag warning lamp blinking pattern with the examples.
Air Bag Warning Lamp Examples
Air bag warning lamp operation (user mode) SRS condition Reference item No malfunction is detected No further action is necessary - The system is malfunctioning Self diagnostic result is not erased after repair Erase "Self Diagnostic Result" Refer to " CONSULT FUNCTION ", How to Erase Self-diagnostic Result Low battery voltage (Less than 9 V) or high battery voltage (more than 16V) Check "Cause of Warning Lamp" with CONSULT Refer to " CONSULT FUNCTION " Malfunction occurs in Occupant detection System Refer to " DIAGNOSIS PROCEDURE " Zero point rest is incomplete Go to " ZERO POINT RESET: SPECIAL REPAIR REQUIREMENT " Intermittent malfunction is detected in the past Go to " INTERMITTENT INCIDENT " Air bag is deployed Seat belt pre-tensioner is deployed Go to " DIAGNOSIS PROCEDURE " or " DIAGNOSIS PROCEDURE " Air bag diagnosis sensor unit is malfunctioning Air bag power supply circuit is malfunctioning Air bag warning lamp circuit is malfunctioning Go to " DIAGNOSIS PROCEDURE " Air bag diagnosis sensor unit is malfunctioning Air bag warning lamp circuit is malfunctioning Go to " DIAGNOSIS PROCEDURE "
Scheme 13
Scheme 14
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Scheme 16
- Follow the procedures of "PROCEDURE TO CHANGE DIAGNOSIS MODE", and switch to the diagnosis mode.
- Turn ignition switch ON. Check the blinking pattern of air bag warning lamp. There are 2 blinking patterns for the air bag warning lamp as per the following items. Front air bag system: 3 second blink followed by a 0.5 second blink repeated. Side air bag system: Two 1.5 second blinks followed by a 0.5 second blink repeated.
| Number of 0.5 second blinks | Malfunctioning items | Blinking pattern |
|---|---|---|
| 0 | Self-diagnostic result is not erased after repair Intermittent malfunction is detected in the past | Refer to the following items Refer to How to Erase Self-diagnostic Result " INTERMITTENT INCIDENT " |
| 1 | Seat belt pre-tensioner RH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 2 | Driver air bag module | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 3 | Seat belt pre-tensioner LH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 5 | Occupant detection system control unit | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 6 | Crash zone sensor | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 7 | Air bag diagnosis sensor unit | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 8 | Passenger air bag module | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 11 | Front passenger air bag OFF indicator | Refer to " DTC LOGIC " |
| 17 | Air bag diagnosis sensor unit | Refer to " DTC LOGIC " |
FRONT AIR BAG SYSTEM BLINKING DESCRIPTION
| Number of 0.5-second blinks | Malfunctioning items | Blinking pattern |
|---|---|---|
| 1 | Side air bag module RH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 2 | Side air bag module LH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 3 | Satellite sensor RH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 4 | Satellite sensor LH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 5 | Curtain air bag module RH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 6 | Curtain air bag module LH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 9 | Front door satellite sensor RH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 10 | Front door satellite sensor LH | Refer to the following items " DTC LOGIC " " DTC LOGIC " " DTC LOGIC " |
| 20 | Front door satellite sensor LH/RH | Refer to the following items " DTC LOGIC " |
SIDE AIR BAG SYSTEM BLINKING DESCRIPTION
System Normal
When system is normal.
Scheme 17
Scheme 18
Scheme 19
- Front air bag system When air bag diagnosis sensor unit system (Item display 1) is malfunctioning.
- Side air bag system When curtain air bag module LH system (Item display 1) is malfunctioning.
Multiple Systems Malfunction
Scheme 20
Scheme 21
Scheme 22
- Front air bag system When driver air bag module (Item display 1) and air bag diagnosis sensor unit system (Item display 2) are malfunctioning.
- Side air bag system When satellite sensor LH (Item display1) and curtain air bag module LH system (Item display 2) are malfunctioning.
- Front air bag system and side air bag system When driver air bag module (Item display 1) and satellite sensor RH (Item display2) are malfunctioning.
CAUSE OF WARNING LAMP
The SRS air bag warning lamp blinks when the ignition voltage is a voltage value (9V or less, or 16 V or more) at which the SRS air bag cannot operate normally. After blinking, if the ignition voltage returns to normal, SRS air bag warning lamp turns OFF. DTC memory is not performed while the abnormal ignition voltage is detected. The mode cannot be switched to trouble diagnosis mode when the ignition switch is operated. "No DTC" is displayed when checking "Self-diagnosis result" using CONSULT.
Note. SRS air bag warning may blink when the condition is out of detection area* of the satellite sensor in door. The system is normal if SRS air bag warning lamp turns OFF after the condition returns within detection area of the satellite sensor in door. SRS air bag warning lamp blinks when the zero point reset is incomplete after replacing the occupant detection system control unit. (SRS air bag warning lamp turns OFF after the zero point reset is complete.) *: Pressure inside of door is excessively low and air bag system cannot be operated normally (example: altitude is approximately 4, 000 m or more).
| Display item | Display content | Actions by worker |
|---|---|---|
| IGN VOLT COND | The ignition voltage recognized by air bag system (air bag control unit and occupant detection system control unit) is displayed or a message stating that condition is out of detection range of satellite sensor in door is displayed. OK: Normal LOW: The ignition voltage is low, high, or out of detection range of satellite sensor in door | Perform the check at an altitude of 4, 000 m or less. Check battery voltage if the ignition voltage status is displayed as "LOW". Check battery voltage if the ignition voltage status is "OK" and the number of times detected is 1 or more. This is because an ignition voltage error may be detected in the past. NOTE: If battery voltage is normal, the cause may be that out of detection range of satellite sensor in door is detected. |
| LOW VOLT TIME | Total number of times is displayed, summing up the number of times ignition voltage error is detected and the number of times that out of detection range of satellite sensor in door is detected. (Detection record is erased and counter returns to "0" by "ERASE MEMORY" in "Self-diagnosis results" using CONSULT.) | |
| LOW V RECORED | Number of times ignition switch ON is displayed after ignition voltage error or out of detection range of satellite sensor in door is detected. (Detection record is erased and counter returns to "0" by "ERASE MEMORY" in "Self-diagnosis results" using CONSULT.) |
| NOTE |
|---|
| If battery voltage is normal, the cause may be that out of detection range of satellite sensor in door is detected. |
WORK SUPPORT
| Monitor item | Description |
|---|---|
| Zero point reset function | Perform zero point reset. Refer to " ZERO POINT RESET: SPECIAL REPAIR REQUIREMENT ". |
DETAILED FLOW
- INTERVIEW THE CUSTOMER FOR THE SYMPTOM Interview the customer for the symptom (the condition and the environment when the incident/malfunction occurs). : GO TO 2.
- CHECK SYMPTOM Check the symptom from the customer information. : GO TO 3.
- CHECK WARNING LAMP OPERATION Check air bag warning lamp operation in the user mode. Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-621372-S42687825252014061000000) ". Are any malfunction detected? YES: GO TO 5 . NO: GO TO 4.
- CHECK LOW VOLTAGE Check low voltage with CONSULT. Refer to " «CONSULT FUNCTION»(ref-621372-S08251311312014061000000) ". Are any malfunction detected? YES: GO TO 9 . NO: Check intermittent incident. Refer to " «INTERMITTENT INCIDENT»(ref-621370-S29645329712014061000000) ".
- CHECK SELF DIAGNOSTIC RESULTS Check self diagnostic result with CONSULT or diagnosis mode. If it is impossible to switch to diagnosis mode, follow the same procedure that DTC is not detected. NOTE: Perform the following procedure if DTC is detected. Record DTC (Print them out with CONSULT.) Erase self diagnostic result. Study the relationship between the malfunction that DTC or air bag warning lamp indicates and the symptom that the customer describes. Check related service bulletins for information. Is DTC detected? YES: GO TO 6. NO: GO TO 7 .
- PERFORM DTC CONFIRMATION PROCEDURE Perform DTC CONFIRMATION PROCEDURE for the DTC. : GO TO 8 .
- PERFORM DIAGNOSIS ACCORDING TO WARNING LAMP OPERATION Check air bag warning lamp operation in the user mode. Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-621372-S42687825252014061000000) ". Perform Diagnosis Procedure for the air bag warning lamp operation. Refer to " «ON BOARD DIAGNOSIS FUNCTION»(ref-621372-S42687825252014061000000) " (USER MODE). : GO TO 9 .
- DETECT MALFUNCTIONING PART BY DIAGNOSTIC PROCEDURE Inspect according to Diagnostic Procedure of the DTC. : GO TO 9.
- REPAIR OR REPLACE THE MALFUNCTION PART Repair or replace the malfunctioning part. : GO TO 10.
- FINAL CHECK Check self diagnostic result and air bag warning lamp operation in the user mode. Is the malfunction repaired? YES: INSPECTION END NO: GO TO 2 .
WORK PROCEDURE WHEN REPLACING CONTROL UNIT
- PERFORM ZERO POINT RESET Perform zero point reset. Refer to " «ZERO POINT RESET: SPECIAL REPAIR REQUIREMENT»(ref-621372-S37977196272014061000000) ". : END
STRUCTURE
It is integrated into the seat sensor mat and detects the occupants and Occupant Detection System control unit that classifies the occupants.