DESCRIPTION
Supplemental Restraint System (SRS) activates air bag module and seat belt pre-tensioner when it detects a frontal collision or a side collision that is more than the specified limit.
Together with other safety devices, it reduces the impact that occupant receives when vehicle collision occurs. Air bag diagnosis sensor unit supplies power supply to air bag module and pre-tensioner seat belt when deceleration that is more than the specified limit is detected by G sensor in air bag diagnosis sensor unit, crash zone sensor, satellite sensor, or front door satellite sensor.
Air bag module is composed of electric igniter (squib), filter, pyrotechnic material, and gas generating material. When air bag module receives a signal from air bag diagnosis sensor unit, air bag module ignites pyrotechnic material using electric igniter (squib) so that gas generating material generates high temperature nitrogen gas. The gas through filter activates air bag. At the same time, pre-tensioner seat belt receives power supply from air bag diagnosis sensor unit, gas generator is activated, and then gas is generated.
Balls in pipe are moved according to generated gas pressure and strike pinion gear on ELR shaft.
ELR shaft rotates and retracts seat belt.
| CAUTION | Never use electrical test equipment on any circuit related to the SRS unless instructed in this Service Information. SRS wiring harnesses can be identified by yellow and/or orange harnesses or harness connectors. Never repair, splice or modify the SRS wiring harness. If the harness is damaged, replace it with a new one. Keep ground portion clean. |
ZERO POINT RESET DESCRIPTION
This vehicle adopts occupant detection system with a weight detecting method. When replacing, or removing and installing passenger seat, always perform "zero point rest" so that the vehicle recognizes zero point.
If zero point reset is incomplete, occupant detection seat sensor does not operate normally.
ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT: Description
When replacing or removing and installing passenger seat, always perform zero point reset so that Occupant Detection System is activated normally.
Zero point reset is an initializing procedure for occupant detection sensor that must be performed when replacing or removing and installing passenger seat.
If zero point reset is not performed, the initialization is incomplete and Occupant Detection System does not operate normally.
Note. When replacing passenger seat with a NISSAN genuine part, air bag warning lamp blinks if zero point reset is incomplete. When zero point reset is performed once after removal and installation of passenger seat, CONSULT displays "complete" and air bag warning does not blink. When reinstalling passenger seat after removal, the initial value for occupant detection sensor changes, and Occupant Detection System does not operate normally. Always perform zero point reset after performing the work as per the following. Reinstallation of passenger seat Replacement of passenger seat with a seat that is zero point reset complete.
The air bags and seat belt pre-tensioners for driver and passenger are activated by the air bag diagnosis sensor unit signal transmitted at the time of the frontal collision.
The side air bag and curtain air bag are activated by the air bag diagnosis sensor unit signal transmitted at the time of side collision.