The SRS (air bag) is a safety device designed to be used in conjunction with the seatbelt. Its purpose is to help protect the driver and passenger in a frontal impact exceeding a certain set limit. The system consists of the SRS unit (including the safing sensor and impact sensor), the cable reel and driver's air bag, and, in most cases, a passenger's air bag. On models equipped with dual air bags, one air bag is stored in the steering wheel and the other in the passenger's side of the dashboard, above the glove box. An air bag system is ineffective if seat belts are not worn.
The air bag is a fabric bag or balloon with an explosive inflator unit attached. The system employs impact sensors and a safing sensor as well as an inflator circuit and control module. A back-up power system is connected in parallel with the battery. No single sensor can trigger SRS deployment. The safing sensor, and at least one of the impact sensors must engage together for at least 0.002 seconds. This "agreement" of the sensors is required to help prevent accidental deployment.
When the control unit receives these signals, power is supplied to the inflator circuit, either from the battery or back-up system. A small heater causes a chemical reaction in the igniter; the non-toxic gas from the chemical mixture expands very rapidly (in milliseconds), filling the bag and forcing it through the cover pad. Since all this is happening very rapidly, the expanding bag should reach the occupant before he/she reaches the steering wheel/dashboard during a frontal collision. The chemical reaction is complete by the time the air bag is fully inflated; as the occupant hits the bag, the gas is allowed to escape slowly through vents in the back of the bag.
The control unit contains a self-diagnostic circuit. When the ignition switch is turned ON , the SRS dash warning lamp should light for about 6 seconds, then go out. If the light does not come on, does not go out or comes on when driving, the system must be diagnosed and repaired by a Honda dealer or reputable shop. The system is NOT repairable at home.
1992-95 SUPPLEMENTAL RESTRAINT SYSTEM (SRS) PRECAUTIONS
See Figures 1 and 2
this information does not cover SRS repairs or replacement as such work should be left to a trained professional. The following precautions then, are only to inform the do-it-yourselfer and give him a greater appreciation for the system when required to work in proximity to SRS components.
All SRS wiring can easily be identified by its yellow outer protective covering.
If removing the steering wheel, make sure the road wheels are straight ahead to avoid misalignment of the steering wheel or air bag on reassembly.
DISARMING THE SYSTEM
- Disconnect the negative battery cable, then the positive cable from the battery. Wait at least three minutes before proceeding.
- Remove the maintenance lid below the air bag on the steering wheel; it is secured by two screws. Remove the red shorting connector stored inside the lid.
- Disengage the connector between the air bag and the cable reel in the steering wheel. The connector can be reached through the opening provided by removing the maintenance lid. Install the shorting connector into the air bag side of the wiring connector.
- To disarm the passenger's side air bag, first remove the glove box. Now disengage the connector between the SRS main harness and the air bag. Install the red shorting connector into the air bag side of the connector.
- DON'T forget to enable the system after the repairs are finished.
ENABLING THE SYSTEM
- Remove the shorting connector from the air bag, then engage the air bag and cable reel (driver's side) or SRS main harness (passenger side) connectors.
- Reinstall the maintenance lid and glove box (as applicable).
- Reconnect the battery cables, positive cable first.
- Turn the ignition switch ON , the SRS dash warning lamp should light for about 6 seconds, then go out. If the light does not come on, does not go out or comes on when driving, the system must be diagnosed and repaired by a Honda dealer or reputable shop.