REMOVAL AND INSTALLATION


caution
  • Disconnect the negative auxiliary battery terminal and wait for 60 seconds or more before starting work. Insulate the disconnected (-) terminal by wrapping the tape (Refer to the item 5 of Service Precautions ).
  • Never attempt to disassemble or repair the air bag module and clock spring. If faulty, replace it with new one.
  • Do not drop the air bag module or clock spring or allow contact with water, grease or oil. If denting, cracking, or deformation is discovered, replace it with new one.
  • Store the air bag module on a flat surface with the deployment surface facing up. Also, do not put anything on it.
  • Do not store the air bag module in a place more than 93°C.
  • When the driver’s air bag have been deployed, replace the driver’s air bag module with new one. Also, check the clock spring, and replace with a new part if there is an abnormality.
  • Put on gloves and safety glasses when handling deployed air bag.
  • When discarding the air bag module, make sure to deploy the air bag before the disposal (Refer to ).
Pre-removal operation
  • Disconnect the negative auxiliary battery terminal.




Driver’s air bag module removal steps
<<A>
1.
 Cover


2.
 Horn connector
<<B>>
3.
 Driver’s air bag module connector
<<C>>
4.
 Driver’s air bag module



Driver’s air bag module installation steps

>>A<<
 ·
 Pre-installation inspection

>>C<<
 4.
 Driver’s air bag module


3.
 Driver’s air bag module connector


2.
 Horn connector


1.
 Cover


·
 Connect the negative auxiliary battery terminal.

>>D<<
 ·
 Post-installation inspection



Clock spring removal steps
<<A>
1.
 Cover


2.
 Horn connector
<<B>>
3.
 Driver’s air bag module connector
<<C>>
4.
 Driver’s air bag module


5.
 Steering wheel nut
<<D>>
6.
 Steering wheel


·
 Steering column cover (Refer to GROUP 37 - Steering Column shaft assembly ).
<<E>>
7.
 Clock spring



Clock spring installation steps

>>A<<
Pre-installation inspection

>>B<<
 7.
 Clock spring


·
 Steering column cover (Refer to GROUP 37 - Steering Column shaft assembly ).

>>C<<
 6.
 Steering wheel


5.
 Steering wheel nut

>>C<<
 4.
 Driver’s air bag module


3.
 Driver’s air bag module connector


2.
 Horn connector


1.
 Cover


·
 Connect the negative auxiliary battery terminal

>>D<<
 ·
 Post-installation inspection

REMOVAL SERVICE POINTS

<<A>> COVER REMOVAL

Insert the special tool ornament remover (MB990784) into the notch shown in the figure, and remove the cover.

<<B>> DRIVER’S AIR BAG MODULE CONNECTOR REMOVAL

Disconnect the connector while sliding the part A shown in the figure to the direction of the arrow.

<<C>> DRIVER’S AIR BAG MODULE REMOVAL
caution
  • Never use an electric tester to diagnose the air bag module circuit. Never attempt to disassemble the air bag module.
  • Be sure to store the removed air bag module in a clean and dry place with a pad surface facing upward.
  • When discarding the air bag module, discard after deploying the air bag as specified in the service procedure (Refer to ).

<<D>> 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.Using special tool steering wheel puller (MB990803), remove the steering wheel assembly as shown in the figure.

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

INSTALLATION SERVICE POINTS

>>A<< PRE-INSTALLATION INSPECTION
1.
caution Dispose of air bag modules only according to the specified procedure (Refer to ).
Before the installation, check the air bag module and clock spring (Refer to ).
note Even when installing a new air bag module or clock spring, perform an inspection before the installation.
2.Connect the negative auxiliary battery terminal.
3.
caution Be sure to turn the ignition key to the LOCK (OFF) position when connecting or disconnecting M.U.T.-III.
Connect M.U.T.-III to the diagnosis connector (16 pin).
4.Turn the ignition switch to the ON position.
5.Read the diagnosis code, and check that everything is normal except the air bag module open circuit.
6.Electric motor switch to the LOCK (OFF) position.
7.
caution Wait at least 60 seconds after disconnecting the auxiliary battery cable before doing any further work (Refer to ).
Disconnect the auxiliary battery (-) terminal cable and wrap it with tapes for insulation.

>>B<< CLOCK SPRING INSTALLATION
1.Confirm that the steering wheel is at the straight-ahead position.

2.
caution If the centre of the clock spring is not correctly aligned, the steering wheel may not be turned fully or the cable inside the clock spring may be broken, causing the SRS air bag to be inoperative or operated incorrectly.
Align the mating marks of the clock spring.
<Alignment of mating marks>
(1) Turn the clock spring clockwise fully.
(2) Turn the clock spring anti-clockwise approximately three and 1/2 turns to align the mating marks.
(3) Check that the white or yellow roller can be seen from the window for checking the neutral point when the mating marks are aligned.
note If the white or yellow roller cannot be seen or black roller can be seen, the neutral point is not aligned correctly.
3.Install the clock spring to the column switch.

>>C<< STEERING WHEEL/DRIVER’S AIR BAG MODULE 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<< POST-INSTALLATION INSPECTION
1.Check that there is no abnormal noise or operational trouble by lightly turning the steering wheel left and right. (After installation of driver’s air bag module and clock spring)
2.Electric motor switch to the "ON" position.

3.Check that the SRS warning lamp is illuminated for 6 to 8 seconds, and extinguished afterward.
4.If the lamp does not extinguish, perform the troubleshooting (Refer to ).