Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Celica 1988-1989.1993-1994.2000 Approved Toyota Celica 1994 air bag restraint system
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AIR BAG RESTRAINT SYSTEM
1994 Toyota Celica
1994 ACCESSORIES/SAFETY EQUIPMENT
Toyota Air Bags
Celica
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all WARNINGS and SERVICE PRECAUTIONS.
DESCRIPTION & OPERATION
Supplemental Restraint System (SRS) consists of a steering
wheel pad (contains air bag), passenger-side air bag (if equipped),
center air bag sensor, spiral cable, left and right front air bag
sensors, and an air bag warning light in the instrument cluster. See
Figs. 4-7. Spiral cable completes the electrical circuit from the
center air bag sensor to the steering wheel pad while allowing the
steering wheel to be turned. Air bags deploy if center air bag sensor
and front air bag sensors detect sufficient impact.
SYSTEM OPERATION CHECK
Turn ignition switch to ACC or ON position. Air bag warning
light should come on for about 6 seconds, then go out. If air bag
warning light does not operate as specified, go to DIAGNOSIS &
TESTING.
SERVICE PRECAUTIONS
Observe the following precautions when servicing SRS:
* Disable SRS before servicing any SRS or steering column
component. Failure to do this could result in accidental air bag
deployment and possible personal injury. See DISABLING &
ACTIVATING AIR BAG SYSTEM.
* When trouble shooting SRS, always check for diagnostic codes
before disconnecting battery.
* After turning ignition switch to LOCK position and disconnecting
negative battery cable, wait at least 90 seconds before working
on SRS. SRS is equipped with a back-up power source that may
allow air bag to deploy until 90 seconds after disconnecting
negative battery cable.
* If vehicle was in a minor collision but air bags did not deploy,
inspect front air bag sensors and steering wheel pad.
* Never use air bag parts from another vehicle. Replace air bag
parts with new parts.
* Remove center air bag sensor and front air bag sensors if
repairing the vehicle requires impacting (shocking) the vehicle.
* Center air bag sensor contains mercury. After replacement, DO NOT
destroy old part. When scrapping vehicle or replacing center air
bag sensor, remove center air bag sensor and dispose of it as
toxic waste.
* Never disassemble and repair front air bag sensors, center air
bag sensor or steering wheel pad.
* Replace dropped, cracked, dented or otherwise damaged component.
* DO NOT expose front air bag sensors, center air bag sensor or
steering wheel pad directly to heat or flame.
* When trouble shooting electrical circuits, use a volt/ohmmeter
with high impedance (10 k/ohm minimum).
* Information labels are attached to air bag components. Follow all
notices on labels.
* After work on SRS is completed, check air bag warning light to
ensure system is functioning properly. See SYSTEM OPERATION
CHECK.
* Always wear safety glasses when servicing or handling an air bag.
* When placing a live air bag on a bench or other surface, always
face air bag and trim cover upward, away from surface. This will
reduce motion of module if it is accidentally deployed.
* After deployment, air bag surface may contain deposits of sodium
hydroxide, which irritates skin. Always wear safety glasses,
rubber gloves and long-sleeved shirt during clean-up. After
clean-up, wash hands using mild soap and water.
* Carry a live air bag module with trim cover (air bag) pointed
away from your body to minimize injury in case of accidental
deployment.
* If SRS is not fully functional for any reason, vehicle should not
be driven until system is repaired and again becomes operational.
DO NOT remove bulbs, modules, sensors or other components or in
any way disable system from operating normally. If SRS is not
functional, park vehicle until it is repaired and functions
properly.
DISABLING & ACTIVATING AIR BAG SYSTEM
WARNING: Back-up power supply maintains SRS voltage for about 90
seconds after battery is disconnected. After disabling SRS,
wait at least 90 seconds before servicing SRS to prevent
accidental air bag deployment and possible personal injury.
Disabling System
Turn ignition switch to LOCK position. Disconnect and shield
negative battery cable. Wait at least 90 seconds before working on
system. Remove steering wheel pad. See STEERING WHEEL PAD & SPIRAL
CABLE under REMOVAL & INSTALLATION. On vehicles equipped with
passenger-side air bag, disconnect passenger-side air bag connector,
accessible through finish plate in glove box. See Fig. 6.
Activating System
Reconnect passenger-side air bag connector (if equipped). See
Fig. 6. Install steering wheel pad. Reconnect negative battery cable.
Perform SYSTEM OPERATION CHECK.
DISPOSAL PROCEDURES
WARNING: Undeployed air bags contain substances that can cause illness
or injury if improperly handled. Disposing of an undeployed
air bag may violate federal, state and/or local laws. If
scrapping vehicle, air bag must be deployed while still
mounted in vehicle. DO NOT deploy air bags inside vehicle
unless vehicle is to be scrapped. Wear gloves and safety
glasses when handling air bag. Wrap deployed air bag in a
sturdy plastic bag and dispose of it like any other part.
ON-VEHICLE DEPLOYMENT (SCRAPPED VEHICLES ONLY)
1) Before proceeding, follow service precautions. See SERVICE
PRECAUTIONS. Disable SRS. See DISABLING & ACTIVATING AIR BAG SYSTEM.
Ensure steering wheel, steering wheel pad and passenger-side air bag
are not loose. If components are loose, deploy air bag(s) using OFF-
VEHICLE DEPLOYMENT procedure.
2) If deploying steering wheel pad, disconnect spiral cable
connector under steering column. If deploying passenger-side air bag,
disconnect passenger-side air bag connector, accessible through glove
box door finish plate. See Fig. 6. For either air bag, connect
Deployment Tool (09082-00700) connector to air bag connector. Position
deployment tool at least 33 feet from front of vehicle.
3) Close all doors and windows of vehicle. Connect deployment
tool Red clip to positive battery terminal and Black clip to negative
battery terminal. Ensure no one is inside or within 33 feet of
vehicle. Press activation switch to deploy air bag. Because of heat,
DO NOT touch air bag for at least 30 minutes after deployment.
OFF-VEHICLE DEPLOYMENT
Steering Wheel Pad
1) Before proceeding, see SERVICE PRECAUTIONS. Disable SRS.
See DISABLING & ACTIVATING AIR BAG SYSTEM. Remove air bag. See
STEERING WHEEL PAD & SPIRAL CABLE under REMOVAL & INSTALLATION.
2) Install 4 bolts in holes provided in rear of steering
wheel pad. Tighten bolts by hand until they become difficult to turn.
DO NOT overtighten bolts. Wrap strong wire at least twice around bolts
on left and right sides of steering wheel pad. See Fig. 2. Ensure no
slack is present in wire. If slack is present, or wire is not strong
enough, steering wheel pad may become loose due to shock when air bag
is deployed.
3) Position steering wheel pad on rim of a scrap wheel and
tire assembly with pad side facing upward. See Fig. 2. Securely tie
steering wheel pad to wheel rim through lug nut holes. Place a large
cardboard box (weighted at sides) or 3 scrap tires on top of steering
wheel pad.
4) Connect Deployment Tool (09082-00700) to steering wheel
pad connector. Position deployment tool at least 33 feet away from
steering wheel pad. Press activation switch to deploy steering wheel
pad. Because of heat, wait 30 minutes before handling steering wheel
pad.
Passenger-Side Air Bag
1) Before proceeding, see SERVICE PRECAUTIONS. Disable SRS.
See DISABLING & ACTIVATING AIR BAG SYSTEM. Remove passenger-side air
bag. See PASSENGER-SIDE AIR BAG under REMOVAL & INSTALLATION.
2) Position passenger-side air bag inside a scrap tire with
air bag trim cover facing inside. See Fig. 3. Secure passenger-side
air bag to tire with wire. Place this tire between 4 other tires (top
tire should have wheel installed). Securely tie all tires together
with wire.
3) Connect Deployment Tool (09082-00700) to passenger-side
air bag connector. Position deployment tool at least 33 feet away from
passenger-side air bag. Press activation switch to deploy passenger-
side air bag. Because of heat, wait 30 minutes before handling
passenger-side air bag.
Fig. 1: Installing Wire Onto Steering Wheel Pad (Typical)
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Fig. 2: Installing Steering Wheel Pad Onto Wheel Assembly
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Fig. 3: Installing Passenger-Side Air Bag Onto Wheel Assembly
Courtesy of Toyota Motor Sales, U.S.A., Inc.
POST-COLLISION INSPECTION
Remove air bag(s) and steering wheel for inspection. See
REMOVAL & INSTALLATION. If air bag(s) deployed, replace air bag(s),
center air bag sensor and both front air bag sensors. Whether air
bag(s) deployed or not, replace components that are cut, cracked,
deformed or otherwise damaged. Also, check the following:
Front Air Bag Sensors
Ensure sensor mounting (including vehicle sheet metal area)
is restored to normal condition.
Spiral Cable
Ensure spiral cable is not deformed and connectors are okay.
Steering Wheel
If horn button contact plate is deformed, replace entire
steering wheel.
Steering Wheel Pad (Air Bag)
Ensure clearance exists between steering wheel pad and
steering wheel. Clearance must be uniform all the way around steering
wheel pad.
Passenger-Side Air Bag
Check for damaged instrument panel, instrument panel
reinforcement, glove box and glove box door. Ensure clearance exists
between outer edge of passenger-side air bag and instrument panel.
Clearance must be uniform all the way around passenger-side air bag.
Wire Harness & Connectors
If front air bag sensor connector is faulty, replace it using
WIRE REPAIR procedure. If any other connector or part of wiring
harness is faulty, replace harness.
REMOVAL & INSTALLATION
WARNING: Failure to follow air bag service precautions may result in
air bag deployment and personal injury. See SERVICE
PRECAUTIONS. After component replacement, perform a system
operational check to ensure proper system operation. See
SYSTEM OPERATION CHECK.
CENTER AIR BAG SENSOR
Removal
Before proceeding, see SERVICE PRECAUTIONS. Disable SRS. See
DISABLING & ACTIVATING AIR BAG SYSTEM. Center air bag sensor is
located under floor console. See Figs. 4-7. Remove floor console
components as necessary. Disconnect center air bag sensor electrical
connector. Remove 4 screws securing center air bag sensor to its
mounting. Remove center air bag sensor.
Installation
To install, reverse removal procedure. Tighten center air bag
sensor screws to specification. See TORQUE SPECIFICATIONS TABLE at the
end of this article. Activate SRS. Check AIR BAG warning light to
ensure system is functioning properly. See SYSTEM OPERATION CHECK.
Fig. 4: Removing Center Air Bag Sensor
Courtesy of Toyota Motor Sales, U.S.A., Inc.
FRONT AIR BAG SENSORS
Removal
1) Before proceeding, follow air bag service precautions. See
SERVICE PRECAUTIONS. Disable SRS. See DISABLING & ACTIVATING AIR BAG
SYSTEM.
2) Remove the following components, then go to next step:
* Celica - Front bumper cover, upper radiator support and condenser
bolt and nut. See Fig. 5.
3) Disconnect front air bag sensor electrical connector.
Remove front air bag sensor mounting bolts and/or nuts. Remove front
air bag sensor.
Installation
To install, reverse removal procedure. Ensure arrow marks on
front air bag sensors face front of vehicle. Tighten front air bag
sensor mounting bolts/nuts to specification. See TORQUE SPECIFICATIONS
TABLE at the end of this article. Activate SRS. Check AIR BAG warning
light to ensure system is functioning properly. See SYSTEM OPERATION
CHECK.
Fig. 5: Removing Front Air Bag Sensors
Courtesy of Toyota Motor Sales, U.S.A., Inc.
PASSENGER-SIDE AIR BAG
NOTE: On Celica, the instrument panel must be removed to remove
the passenger-side air bag.
Removal
1) Before proceeding, see SERVICE PRECAUTIONS. Disable SRS.
See DISABLING & ACTIVATING AIR BAG SYSTEM. Disconnect passenger-side
air bag connector, accessible through glove box door finish plate. See
Fig. 6.
2) Remove components No. 1-21. See Fig. 6. Remove radio.
Disconnect cable end from air mix (temperature) door lever on left
side of heater case. Disconnect cable end from heater water valve in
engine compartment. Remove 2 screws and A/C-heater control panel.
3) Remove components No. 22-28. See Fig. 6. Disconnect
electrical harness connectors. Remove 2 nuts and 7 bolts securing
instrument panel. Remove instrument panel. Remove components from
instrument panel as necessary for access to passenger-side air bag.
4) Remove 3 bolts and 4 nuts securing passenger-side air bag.
Remove passenger-side air bag. Remove 2 screws securing passenger-side
air bag door. Remove passenger-side air bag door.
Installation
To install, reverse removal procedure. Tighten fasteners to
specification. See TORQUE SPECIFICATIONS TABLE at the end of this
article. Activate SRS. Check air bag warning light to ensure system is
functioning properly. See SYSTEM OPERATION CHECK.
Fig. 6: Removing Passenger-Side Air Bag
Courtesy of Toyota Motor Sales, U.S.A., Inc.
STEERING WHEEL PAD & SPIRAL CABLE
Removal
1) Before proceeding, see SERVICE PRECAUTIONS. Turn ignition
switch to LOCK position. Disconnect and shield negative battery cable.
Wait at least 90 seconds. On vehicles with passenger-side air bag,
disconnect passenger-side air bag connector, accessible through finish
plate in glove box. See Fig. 6.
2) Ensure front wheels are in straight-ahead position. Remove
covers from sides of steering wheel for access to steering wheel pad
Torx screws. Loosen Torx screws until groove along screw circumference
catches on screw case. See Fig. 7.
3) Pull steering wheel pad from steering wheel and disconnect
steering wheel pad connector. See Fig. 8. Place steering wheel pad on
a flat surface with pad cover facing up. Remove steering wheel nut.
Mark steering wheel in relation to steering shaft for installation
reference. Remove steering wheel with a puller.
4) Remove steering column covers. Disconnect spiral cable
lower connector. Remove screws securing spiral cable to combination
switch (headlight/turn signal/wiper switch). Remove spiral cable.
NOTE: It may be necessary to remove combination switch and spiral
cable as an assembly, and then separate components.
WARNING: During installation, if spiral cable mating marks are not
properly aligned, steering wheel may not turn completely, or
flat cable inside spiral cable may be severed, disabling SRS
system.
Installation
To install, reverse removal procedure. Before installing
spiral cable, ensure front wheels are in straight-ahead position and
spiral cable is properly aligned. See SPIRAL CABLE under ADJUSTMENTS.
Tighten steering wheel nut and steering wheel pad screws to
specification. See TORQUE SPECIFICATIONS TABLE at the end of this
article. After installation, reconnect passenger-side air bag
connector (if equipped). Reconnect negative battery cable. Perform
SYSTEM OPERATION CHECK.
Fig. 7: Loosening Steering Wheel Pad Torx Screws (Typical)
Courtesy of Toyota Motor Sales, U.S.A., Inc.
Fig. 8: Removing Steering Column Components (Similar)
Courtesy of Toyota Motor Sales, U.S.A., Inc.
ADJUSTMENTS
SPIRAL CABLE
Ensure front wheels are in straight-ahead position. Turn
spiral cable counterclockwise until it becomes difficult to turn. Turn
spiral cable clockwise about 3 turns to align Red mating marks. See
Fig. 9. Install steering wheel.
Fig. 9: Aligning Spiral Cable
Courtesy of Toyota Motor Sales, U.S.A., Inc.
WIRE REPAIR
WARNING: Except for a damaged front air bag sensor connector, no other
part of the harness can be repaired. If wiring harness is
damaged, replace complete wiring harness. Use the following
procedure to replace front air bag sensor connector by
splicing a new connector into the harness.
1) Obtain 2 Pressure-Contact Sleeves (82988-24010 or 82999-
12020). See Fig. 10. Remove cover from rear end of front air bag
sensor connector. Cut off connector, cutting wires as close to
connector as possible. Carefully strip .31-.43" (8-11 mm) of
insulation from end of each wire. DO NOT damage wire. If wire is
damaged, strip wire ends again.
2) Insert stripped wire ends into pressure-contact sleeve,
with overlap junction inside of pressure-contact sleeve. See Fig. 10.
Position middle of sleeve in Blue crimping section of Crimper
(169060). Squeeze crimper until 2 protrusions on section of crimper
marked CLOSE HERE contact each other.
3) Pull wires to ensure a secure crimp. Crimp both ends of
pressure-contact sleeve using crimper at INS position. See Fig. 10.
Thoroughly wrap silicon tape around sleeve for protection. Wrap vinyl
tape around corrugated tubes to secure them to wires.
Fig. 10: Crimping Pressure-Contact Sleeve
Courtesy of Toyota Motor Sales, U.S.A., Inc.
SELF-DIAGNOSTIC SYSTEM
AIR BAG WARNING LIGHT CHECK
Turn ignition switch to ACC or ON position. If air bag
warning light comes on then goes out after about 6 seconds, system is
okay at this time. If air bag warning light comes on and stays on (or
flashes), diagnostic code is stored in center air bag sensor. Go to
RETRIEVING CODES. If air bag warning light responds in any other way,
go to DIAGNOSIS & TESTING.
RETRIEVING CODES
CAUTION: If jumper wire is incorrectly connected across terminals of
Data Link Connector (DLC), system may be damaged. Use
Diagnosis Check Wiring (09843-18020) when connecting jumper
wire between terminals of DLC.
1) Turn ignition switch to ACC or ON position. Wait about 20
seconds. Connect jumper wire between terminals Tc and E1 of Data Link
Connector (DLC). See DATA LINK CONNECTOR (DLC) LOCATION table. See
Figs. 11 and 12.
2) If air bag warning light does not flash codes, go to
CODE(S) NOT DISPLAYED under DIAGNOSIS & TESTING. If air bag warning
light flashes continuously at a rate of 2 times per second, source
voltage is low. Go to NO CODES, SOURCE VOLTAGE DROP under TROUBLE
SHOOTING.
3) If air bag warning light flashes codes, count number of
flashes to determine code(s) that are set. For example, Code 12 is:
FLASH, pause, FLASH, FLASH. If more than one code is displayed, a 2.5-
second pause will occur between each code. Lowest numbered codes will
be displayed followed by higher numbered codes.
4) After all codes are displayed, a 4-second pause will occur
and codes will be repeated. See INTERPRETING CODES. See appropriate
CODE under TROUBLE SHOOTING. After servicing, clear codes. See
CLEARING CODES.
NOTE: If code(s) other than those listed under INTERPRETING CODES
are displayed, replace center air bag sensor. If air bag
warning light does not function as described, go to CODE(S)
NOT DISPLAYED or CODE(S) CONTINUOUSLY DISPLAYED under
DIAGNOSIS & TESTING.
DATA LINK CONNECTOR (DLC) LOCATION TABLE
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