Acura Coupes and Sedans 1986-1993 Repair Guide

General Information

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The air bag system used on the Legend, Legend Coupe and Vigor is referred to as the Supplemental Restraint System (SRS). The SRS system provides additional protection for the driver, if a forward collision of sufficient force is encountered. The SRS assists the normal seat belt restraining system by deploying an air bag, via the steering column. The system is equipped with a left and right front sensor, SRS unit (which includes 2 cowl sensors), a cable reel, driver air bag and passenger air bag, if equipped.

The Legend Coupe and the 1992-93 Legend are also equipped with seat belt pre-tensioners, which tighten the seat belts upon a frontal impact. These are explosive devices and deploy simultaneously with the air bags. Special precautions must be taken when working on a vehicle equipped with seat belt pre-tensioners.

SYSTEM OPERATION



The SRS system contains a SRS unit assembly with built-in cowl sensors and backup power. The function of the SRS unit is to supply current to the air bag assembly, in the steering wheel, which will cause air bag deployment during a severe accident. The SRS unit supplies the necessary power, even if the battery has been damaged. The backup power unit is connected in parallel with the vehicle's battery.

The SRS unit includes a self-diagnosis function. When the ignition switch is turned ON, the SRS warning light comes ON and goes out after approximately 8 seconds, if the system is operating properly. If a fault is detected in a sensor, SRS unit, inflator or their circuits, the SRS warning light in the instrument panel will remain ON while driving.

SYSTEM COMPONENTS



See Figures 1, 2 and 3



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Fig. Fig. 1: Air bag component locations-Legend without passenger side air bag



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Fig. Fig. 2: Air bag component locations-Legend with passenger side air bag and seat belt pretensioners



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Fig. Fig. 3: Air bag component locations-Vigor

Driver Air Bag

The air bag, located in the steering wheel, is a device designed to rapidly inflate when the vehicle is involved in a frontal impact exceeding a certain set limit. It must be disabled when performing service on the vehicle.

Passenger Air Bag

The passenger air bag, if equipped, deploys the same time as the driver air bag. It is located on the passenger side dash panel and must be disabled when performing service on the vehicle.

Seat Belt Pre-Tensioners

The seat belt pre-tensioners, if equipped, deploys the same time as the air bags. They are located at the bottom of the B-pillars and must be disabled when performing service on the vehicle.

Warning Light

The warning light, located in the instrument panel, alerts the driver if a fault is detected in the air bag system.

Dash Sensors

The dash sensors are calibrated to close with velocity changes. The are located on the floor under the dash panel.

Cowl Sensor

The cowl sensor is calibrated to close with velocity changes. Single air bag vehicles are equipped with one, while dual air bag vehicles are equipped with two. They are located inside the SRS unit.

SRS Unit

The SRS unit contains built-in cowl sensors and backup power. The function of the SRS unit is to supply current to the air bag(s) in the steering wheel, deployment during a severe frontal impact.

SERVICE PRECAUTIONS




CAUTION
To avoid deployment when servicing the SRS system or components in the immediate area, do not use electrical test equipment such as battery or A.C. powered voltmeter, ohmmeter, etc. or any type of tester other than specified. Do not use a non-powered probe tester. To avoid personal injury, all precautions must be strictly followed.



Disconnect both battery cables and wait at least 3 minutes before disconnecting the air bag and seat belt pre-tensioner system for installing the short connectors.
 
Always keep the short connector on the air bag connectors and seat belt pre-tensioners when the harnesses are disconnected.
 
Do not attempt to disassemble an air bag assembly or seat belt pre-tensioner assembly.
 
Always store a removed air bag assembly with the pad surface upwards.
 
The entire affected SRS harness assembly must be replaced if there is an open circuit or damage to the wiring.
 
Never install used SRS parts from another vehicle.
 
Make sure all ground locations, including sensor fasteners, are clean and securely attached.
 
Never replace the original steering wheel with any other design, since it will make it impossible to install the air bag.
 
Never install an air bag assembly that shows signs of being dropped or improperly handled, such as dents, cracks or deformation.
 
Always wear gloves and safety glasses when handling the air bag assembly. Wash hands with mild soap and water afterwards.
 
Always store the air bag assembly on a secure flat surface, away from high heat source and free of oil, grease, detergent or water.
 
Never disconnect any electrical connection with the ignition switch ON .
 
Before disconnecting the negative battery cable, make a record of the contents memorized by each memory system like the clock, audio, etc., when service or repairs are completed make certain to reset these memory system.
 
Leave new components and modules in the shipping package until ready to install them.
 
Make certain that the SRS wiring harness is not pinched by or interfering with any other parts.
 
SRS wiring can be identified by a special yellow outer protective covering. They should never be modified, spliced or repaired.
 
The connectors at the SRS unit and the fuse box are double-locked. If removing them, first lift the connector lid with a thin bladed tool, then press the connector tab down and push the connector outward. When reconnecting, push both connectors until it snaps, then close the connector lid.
 
Always touch a vehicle ground after sliding across a vehicle seat or walking across vinyl or carpeted floors to avoid static charge damage.
 


CAUTION
The air bag system and pre-tensioner system must be disabled before performing service on or around the steering column, air bag or instrument panel components and wiring. Failure to follow safety and disabling procedures could result in air bag deployment, unnecessary air bag system repairs or personal injury.

DISARMING THE SYSTEM



See Figures 4 through 8



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Fig. Fig. 4: Location of the steering wheel air bag short connector-Legend



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Fig. Fig. 5: Location of the steering wheel air bag short connector-Vigor



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Fig. Fig. 6: Location of the passenger side air bag short connector-Legend



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Fig. Fig. 7: Location of the passenger side air bag short connector-Vigor



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Fig. Fig. 8: Location of the seat belt pretensioner short connector-Legend

  1. Turn the ignition switch OFF .
  2.  
  3. Disconnect the negative battery cable, then disconnect the positive battery cable. Wait 3 minutes.
  4.  
  5. For the driver air bag:
    1. Remove the access panel lid below the air bag assembly on the steering wheel and remove the short connector (red).
    2.  
    3. Disconnect the connector between the air bag and cable reel.
    4.  
    5. Connect the red short connector to the air bag side of the connector.
    6.  

  6.  
  7. For the passenger air bag:
    1. Remove the glove box, then remove the short connector from its holder.
    2.  
    3. Disconnect the 3-pin connector between the passenger air bag and the main harness.
    4.  
    5. Connect the red short connector to the air bag side of the connector.
    6.  

  8.  
  9. After installing the short connectors on the air bags, connect short connector 07-MAZ-SP-00200, or equivalent, on the cable reel connector and another on the main harness connector of the passenger air bag to prevent static electricity from setting off the seat belt pre-tensioners before you disconnect them.
  10.  
  11. For the seat belt pre-tensioners, disarm them one side at a time:
    1. Remove the B-pillar trim panels.
    2.  
    3. Remove the red short connector from the short connector holder.
    4.  
    5. Disconnect the pre-tensioner 3-pin connector, then install the short connector to the pre-tensioner side of the connector.
    6.  

  12.  

ENABLING THE SYSTEM



  1. Remove the red short connector(s) one at a time from the air bag connector(s) and pre-tensioners and reconnect the harness connectors as soon as each short connector has been removed, to avoid static electricity from deploying an igniter module.
  2.  
  3. Install the red short connector to its storage location.
  4.  
  5. Reconnect the positive, then the negative battery cable.
  6.  
  7. Check for proper operation, as follows: Turn the ignition switch to the ON (II) position. The instrument panel SRS indicator light should come ON for approximately 6-8 seconds, then go OFF.
  8.  

 
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