Acura Coupes and Sedans 1994-2000 Repair Information

General Information

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The Air Bag or Supplemental Restraint System (SRS) is designed to provide additional protection for front seat occupants when used in conjunction with a seat belt. The system is an electronically controlled, mechanically operated system. The system contains two basic sub-systems: the air bag module(s) (the actual air bag(s) themselves), and the electrical system. The system consists of:



The crash sensors
 
The safing sensor
 
The air bag module(s)
 
The diagnostic monitor
 
The instrument cluster indicator
 
The sliding contacts (clock spring assembly)
 

The system is operates as follows: The system remains out of sight until activated in an accident that is determined to be the equivalent of hitting a parked car of the same size and weight at 28 mph (40 km/h) with the vehicle receiving severe front end damage. This determination is made by crash and safing sensors mounted on the vehicle which when an sufficient impact occurs, close their contacts completing the electrical circuit and inflating the air bags. When not activated the system is monitored by the air bag diagnostic monitor and system readiness is indicated by the lamp located on the instrument cluster. Any fault detected by the diagnostic monitor will illuminate the lamp and store a Diagnostic Trouble Code (DTC).

See Figure 1

Click image to see an enlarged view

Fig. Fig. 1: Air bag component location

SERVICE PRECAUTIONS



When working on the SRS or any components which require the removal of the air bag, adhere to all of these precautions to minimize the risks of personal injury or component damage:



Before attempting to diagnose, remove or install the air bag system components, you must first detach and isolate the negative (-) battery cable. Failure to do so could result in accidental deployment and possible personal injury.
 
SRS components should not be subjected to heat over 200°F (93°C), so remove the SRS control unit, air bag modules and clock spring before drying or baking the vehicle after painting.
 
When an undeployed air bag assembly is to be removed, after detaching the negative battery cable, allow the system capacitor to discharge for two minutes before commencing with the air bag system component removal.
 
Replace the air bag system components only with factory specified replacement parts, or equivalent. Substitute parts may visually appear interchangeable, but internal differences may result in inferior occupant protection.
 
Never use an analog ohmmeter to test SRS components.
 
The fasteners, screws, and bolts originally used for the SRS have special coatings and are specifically designed for the SRS. They must never be replaced with any substitutes. Anytime a new fastener is needed, replace with the correct fasteners provided in the service package or fasteners listed in the parts books.
 

Handling a Live Air Bag Module See Figures 2 and 3

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Fig. Fig. 2: Use extreme caution when removing an air bag



Click image to see an enlarged view

Fig. Fig. 3: Always carry an air bag with the trim side away from you

At no time should any source of electricity be permitted near the inflator on the back of the module. When carrying a live module, the trim cover should be pointed away from the body to minimize injury in the event of accidental deployment. In addition, if the module is placed on a bench or other surface, the plastic trim cover should be face up to minimize movement in case of accidental deployment.

When handling a steering column with an air bag module attached, never place the column on the floor or other surface with the steering wheel or module face down.

Handling a Deployed Air Bag Module

The vehicle interior may contain a very small amount of sodium hydroxide powder, a by-product of air bag deployment. Since this powder can irritate the skin, eyes, nose or throat, be sure to wear safety glasses, rubber gloves and long sleeves during cleanup.

If you find that the cleanup is irritating your skin, run cool water over the affected area. Also, if you experience nasal or throat irritation, exit the vehicle for fresh air until the irritation ceases. If irritation continues, see a physician.

Begin the cleanup by putting tape over the two air bag exhaust vents so that no additional powder will find its way into the vehicle interior. Then, remove the air bag(s) and air bag module(s) from the vehicle.

Use a vacuum cleaner to remove any residual powder from the vehicle interior. Work from the outside in so that you avoid kneeling or sitting in an uncleaned area.

Be sure to vacuum the heater and A/C outlets as well. In fact, it's a good idea to run the blower on low and to vacuum up any powder expelled from the plenum. You may need to vacuum the interior of the car a second time to recover all of the powder.

Check with the local authorities before disposing of the deployed bag and module in your trash.

After an air bag has been deployed, the air bag module and clockspring must be replaced because they cannot be reused. Other air bag system components should be replaced with new ones if damaged.

DISARMING THE SYSTEM



  1. Position the front wheels straight ahead.
  2.  
  3. Place the ignition switch in the LOCK position, then remove the ignition key.
  4.  
  5. Disconnect the negative battery cable. Isolate the battery cable by taping up any exposed metal areas of the cable. This will keep the cable from inadvertently contacting the battery and causing accidental deployment of the air bag.
  6.  
  7. Allow the system capacitor to discharge for at least 3 minutes, although 10 minutes is recommended to allow the complete dissipation of any residual energy.
  8.  

ARMING THE SYSTEM



  1. Turn the ignition switch to the ON position. The SRS indicator lamp should come on for about six seconds and then it will go off.
  2.  
  3. Test drive the vehicle and check for an illumination of the SRS indicator lamp.
  4.  
  5. Test the horn to ensure that it too works.
  6.  

 
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