REMOVAL AND INSTALLATION


warning
  • Never attempt to disassemble or repair the air bag modules or clock spring. If faulty, replace it.
  • Do not drop the air bag modules or clock spring or allow contact with water, grease or oil. Replace it if a dent, crack, deformation or rust is detected.
  • The air bag modules should be stored on a flat surface is facing upward. Do not place anything on top of it.
  • Do not expose the air bag modules to temperatures over 93°C.
  • When the driver’s and front passenger’s (front) air bags have been deployed, replace the driver’s and passenger’s (front) air bag modules with new ones. Also, check the clock spring, and replace with a new part if there is an abnormality.
  • Wear gloves and safety glasses when handling air bags that have already deployed.
  • An non-deployed air bag module should only be disposed of in accordance with the procedures (Refer to ).

DRIVER’S AIR BAG MODULE AND CLOCK SPRING


caution After the installation, perform a calibration for the ASTC-ECU to learn the steering wheel sensor neutral point. (Refer to GROUP 35C, On-vehicle Service-Steering Wheel Sensor Initialisation




Driver’s air bag module removal steps
<<A>>
1.
 Negative battery cable connection
<<B>>
2.
 Cover


3.
 Horn connector connection
<<C>>
4.
 Driver’s air bag module connector connection
<<D>>
5.
 Driver’s air bag module



Clock spring removal steps
<<A>>
1.
 Negative battery cable connection
<<B>>
2.
 Cover


3.
 Horn connector connection
<<C>>
4.
 Driver’s air bag module connector connection
<<D>>
5.
 Driver’s air bag module
<<E>>
6.
 Steering wheel assembly


·
 Lower, upper column cover (Refer to GROUP 37, Steering column and shaft assembly .)
<<F>>
7.
 Clock spring



Driver’s air bag module installation steps

>>A<<
 ·
 Pre-installation inspection


>>C<<
 5.
 Driver’s air bag module

>>D<<
 4.
 Driver’s air bag module connector connection

>>D<<
 3.
 Horn connector connection


2.
 Cover


1.
 Negative battery cable connection

>>E<<
 ·
 Post-installation inspection



Clock spring installation steps

>>A<<
 ·
 Pre-installation inspection

>>B<<
 7.
 Clock spring


·
 Lower, upper column cover (Refer to GROUP 37, Steering column and shaft assembly .)

>>C<<
 6.
 Steering wheel assembly

>>C<<
 5.
 Driver’s air bag module

>>D<<
 4.
 Driver’s air bag module connector connection

>>D<<
 3.
 Horn connector connection


2.
 Cover


1.
 Negative battery cable connection

>>E<<
 ·
 Post-installation inspection

PASSENGER’S (FRONT) AIR BAG MODULE



Removal steps
<<A>>
1.
 Negative battery cable connection
<<G>>
2.
 Passenger’s (front) air bag module connector connection


·
 Instrument panel (Refer to GROUP 52A, Instrument panel .)


·
 Distribution duct (Refer to GROUP 55, Ducts .)


3.
 Air bag passenger side bracket
<<H>>
4.
 Passenger’s (front) air bag module



Installation steps

>>A<<
 ·
 Pre-installation inspection


4.
 Passenger’s (front) air bag module


3.
 Air bag passenger side bracket


·
 Distribution duct (Refer to GROUP 55, Ducts .)


·
 Instrument panel (Refer to GROUP 52A, Instrument panel .)


2.
 Passenger’s (front) air bag module connector connection


1.
 Negative battery cable connection

>>E<<
 ·
 Post-installation inspection

REMOVAL SERVICE POINTS

<<A>> NEGATIVE BATTERY CABLE DISCONNECTION
danger Wait at least 60 seconds after disconnecting the battery cable before doing any further work. (Refer to ).

Disconnect the negative battery cable from the battery and tape the terminal to prevent accidental connection and air bag(s) deployment.

<<B>> COVER REMOVAL

Insert the special tool ornament remover (MB990784) as shown in the illustration to remove the cover.

<<C>> DRIVER’S AIR BAG MODULE CONNECTOR DISCONNECTION

Slide the outer housing of the driver’s air bag module connector in the arrow direction shown, and disconnect the connector.

<<D>> DRIVER’S AIR BAG MODULE REMOVAL
warning
  • Never use an electric tester to diagnose the air bag module circuit. Never attempt to disassemble the air bag module.
  • The removed driver’s air bag module should be stored in a clean, dry place with the deployment surface facing up.

<<E>> STEERING WHEEL ASSEMBLY REMOVAL
1.
caution Use the special tool to remove the steering wheel since the steering column collision absorbing mechanism may be damaged.
Position the steering wheel in a straight ahead direction.

2.Use special tool steering linkage puller (MB990803) to remove the steering wheel assembly as shown.

<<F>> CLOCK SPRING REMOVAL
warning The removed clock spring should be stored in a clean, dry place.

<<G>> PASSENGER’S (FRONT) AIR BAG MODULE CONNECTOR DISCONNECTION

Slide the outer housing of the instrument panel wiring connector in the arrow direction shown, and disconnect the connector.

<<H>> PASSENGER’S (FRONT) AIR BAG MODULE REMOVAL
warning
  • Never use an electric tester to diagnose the air bag module circuit. Never attempt to disassemble the air bag module.
  • The removed passenger’s (front) air bag module should be stored in a clean, dry place with the deployment surface facing up.

Insert a flat-tipped screwdriver or similar tool to the location shown in the figure. After disengaging the tabs, remove the front passenger’s (front) air bag module.

INSTALLATION SERVICE POINTS

>>A<< PRE-INSTALLATION INSPECTION
1.When installing the new air bag modules and clock spring, refer to “INSPECTION” ().
note Even when installing a new air bag module or clock spring, perform an inspection before the installation.
2.Connect the negative battery cable.
3.
caution To prevent damage to M.U.T.-III, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting M.U.T.-III.
Connect M.U.T.-III to the diagnosis connector.
4.Turn the ignition switch to the “ON” position.
5.Check DTCs using M.U.T.-III to ensure entire SRS operates properly.
At this time, check that no diagnosis code except B1401, B1411, B1481 and B1491 are set.
6.
danger Wait at least 60 seconds after disconnecting the battery cable before doing any further work (Refer to ).
Turn the ignition switch to the "LOCK" (OFF) position. Disconnect the negative battery cable and tape the terminal to prevent accidental connection and air bags deployment.

>>B<< CLOCK SPRING INSTALLATION

1.
warning Ensure that the clock spring’s mating marks are properly aligned. If not, the steering wheel may not rotate completely during a turn, or the flat cable in the clock spring could be damaged, This would prevent normal SRS operation and possibly cause serious injury to the driver.
Align the mating marks of the clock spring.
Mating Mark Alignment
Turn the clock spring clockwise fully. Then turn it back approximately 3 3/4 turns anti-clockwise to align the mating marks.
2.Turn the front wheels to the straight-ahead position. Then install the clock spring to the column switch.

>>C<< STEERING WHEEL ASSEMBLY/DRIVER’S AIR BAG MODULE ASSEMBLY INSTALLATION
1.
caution When installing the steering wheel and driver’s air bag module, ensure that the harness of the clock spring does not become caught or tangled.
Before installing the steering wheel and driver’s air bag module, turn the vehicle’s front wheels to the straight-ahead position and align the mating marks of the clock spring.
2.After securing the steering wheel, turn the steering wheel all the way in both directions to confirm that the steering wheel rotation is normal.

>>D<< DRIVER’S AIR BAG MODULE CONNECTOR CONNECTION / HORN CONNECTOR CONNECTION
Connect the connector securely and route the harnesses not to lie off the cover hole.

>>E<< POST-INSTALLATION INSPECTION
1.Reconnect the negative battery cable.
2.Turn the ignition switch to “ON” position.

3.Does the SRS warning lamp illuminate for about 7 seconds, and go out?
4.If no, refer to troubleshooting (Refer to ).