REMOVAL AND INSTALLATION

caution

Disconnect the negative (-) 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 (-) battery terminal.
Check that the front wheels are at the straight-ahead position.

			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
	>>D<<	3.	Driver’s air bag module connector
	>>D<<	2.	Horn connector
		1.	Cover
	>>E<<	·	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.	Flange nut
<<D>>		6.	Steering wheel assembly
		·	Steering column lower, upper cover (Refer to GROUP 37A - Steering Column shaft assembly ).
		7.	Paddle shift switch
<<E>>		8.	Clock spring
			Clock spring installation steps
	>>A<<		Pre-installation inspection
	>>B<<	8.	Clock spring
		7.	Paddle shift switch
		·	Steering column lower, upper cover (Refer to GROUP 37A - Steering Column shaft assembly ).
	>>C<<	6.	Steering wheel assembly
		5.	Flange nut
	>>C<<	4.	Driver’s air bag module
	>>D<<	3.	Driver’s air bag module connector
	>>D<<	2.	Horn connector
		1.	Cover
	>>E<<	·	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

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

<<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 ).

Loosen the torx screw and remove the air bag module assembly.

<<D>> STEERING WHEEL ASSEMBLY REMOVAL

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.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 (-) battery terminal.

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.Turn the ignition switch to the LOCK (OFF) position.

>>B<< CLOCK SPRING INSTALLATION

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.
When aligning the clock spring neutral position mark, perform with the clock spring independently. If performed with the steering wheel sensor installed, the steering wheel sensor may be damaged.

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 roller can be seen from the window for checking the neutral point when the mating marks are aligned.

note

If the white roller cannot be seen or black roller can be seen, the neutral point is not aligned correctly.

(4) Install the clock spring to the column switch.

>>C<< STEERING WHEEL ASSEMBLY/DRIVER’S AIR BAG MODULE INSTALLATION

caution

When installing the steering wheel assembly and air bag module, do not trap the clock spring harness.

After checking the clock spring centre alignment is already performed, install the steering wheel assembly and air bag module.

2.After the installation, check that there is no abnormality when the steering wheel is fully turned to left and right.

>>D<< DRIVER’S AIR BAG MODULE CONNECTOR/HORN CONNECTOR CONNECTION

Connect the connector securely and route the harnesses not to lie off the cover hole.

>>E<< POST-INSTALLATION INSPECTION

1.Connect the negative (-) battery cable.

2.Turn the ignition 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