AIR BAR MODULE(S) AND CLOCK SPRING

REMOVAL AND INSTALLATION

WARNING

Disconnect the negative battery terminal and wait for 60 seconds or more before starting work. Also, the disconnected battery terminal should be insulated with tape (Refer to ).

Never attempt to disassemble or repair the air bag modules and clock spring. If faulty, just replace with new one(s).

Do not drop the air bag modules or clock spring or allow contact with water, grease or oil. Replace if a dent, crack, deformation or rust are present.

Store the air bag modules on a flat surface with the deployment surface facing up. Do not place anything on top of them.

Do not store the air bag modules in a place more than 93°C.

When the driver's and front passenger's air bags have been deployed, replace the driver's and passenger's air bag modules with new ones.

Put on gloves and safety glasses when handling deployed air bags.

When discarding the undeployed air bag module(s), be sure to deploy the air bag(s) in advance as specified in the service procedure (Refer to ).

For removal and installation of the front seatback assembly with side air bag module, refer to GROUP52A - Front Seat

			Air bag module removal steps
<<A>>		1.	Cover
<<B>>		2.	Steering wheel and air bag module assembly
		3.	Steering wheel
<<C>>		4.	Air bag module
			Clock spring removal steps
<<A>>		1.	Cover
<<B>>		2.	Steering wheel and air bag module assembly
		•	Column cover lower (Refer to GROUP 37 - Steering shaft ).
		5.	Sub harness
<<F>>		6.	Clock spring
			Air bag module installation steps
	>>A<<	•	Pre-installation inspection
		4.	Air bag module
		3.	Steering wheel
	>>C<<	2.	Steering wheel and air bag module assembly
		1.	Cover
		•	Negative battery cable connection
	>>D<<	•	Post-installation inspection
			Clock spring installation steps
	>>A<<	•	Pre-installation inspection
	>>B<<	6.	Clock spring
		5.	Sub harness
		•	Column cover lower (Refer to GROUP 37 - Steering shaft ).
	>>C<<	2.	Steering wheel and air bag module assembly
		1.	Cover
		•	Negative battery cable connection
	>>D<<	•	Post-installation inspection

			Air bag module removal steps
<<A>>		1.	Cover
<<D>>		2.	Air bag module
<<E>>		3.	Steering wheel
		4.	Sub harness
			Clock spring removal steps
<<A>>		1.	Cover
<<D>>		2.	Air bag module
<<E>>		3.	Steering wheel
		•	Column cover lower (Refer to GROUP 37 - Steering shaft ).
<<F>>		5.	Clock spring
			Air bag module installation steps
	>>A<<	•	Pre-installation inspection
		4.	Sub harness
		3.	Steering wheel
		2.	Air bag module
		1.	Cover
		•	Negative battery cable connection
	>>D<<	•	Post-installation inspection
			Clock spring installation steps
	>>A<<	•	Pre-installation inspection
	>>B<<	5.	Clock spring
		4.	Sub harness
		•	Column cover lower (Refer to GROUP 37 - Steering shaft ).
	>>C<<	3.	Steering wheel
	>>C<<	2.	Air bag module
		1.	Cover
		•	Negative battery cable connection
	>>D<<	•	Post-installation inspection

			Air bag module removal steps
		•	Instrument panel assembly (Refer to GROUP 52A - Instrument panel <LH drive vehicles >, <RH drive vehicles >).
		•	Distribution duct (Refer to GROUP 52A - Instrument panel) <LH drive vehicles >, <RH drive vehicles >.
		1.	Air bag module bracket
<<G>>		2.	Air bag module
			Air bag module installation steps
	>>A<<	•	Pre-installation inspection
		2.	Air bag module
		1.	Air bag module bracket
		•	Distribution duct (Refer to GROUP 52A - Instrument panel <LH drive vehicles >, <RH drive vehicles ).
		•	Instrument panel assembly (Refer to GROUP 52A - Instrument panel <LH drive vehicles >, <RH drive vehicles >).
		•	Negative battery cable connection
	>>D<<	•	Post-installation inspection

REMOVAL SERVICE POINTS

<<A>> COVER REMOVAL

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

<<B>> STEERING WHEEL AND AIR BAG MODULE ASSEMBLY REMOVAL

By sliding the A section (in the figure) of the air bag module connector in the arrow direction, disconnect the connector.

Disconnect the steering shift switch connector while pushing its claw toward the arrow direction.

Insert the hexagonal bit socket into the arrow section in the figure. Completely loosen the bolt, and then remove the steering wheel air bag module assembly.

NOTE: Use a hexagonal bit socket or a hexagonal wrench having an effective length of 75 mm or more in the hexagonal section and the diameter of 8 mm or more.

<<C>> DRIVER’S AIR BAG MODULE REMOVAL

WARNING

The air bag module must not be measured with such equipment as an ohmmeter, nor disassembled.

The removed air bag module should be stored in a clean, dry place with the deployment surface facing up.

<<D>> DRIVER’S AIR BAG MODULE REMOVAL

WARNING

The air bag module must not be measured with such equipment as an ohmmeter, nor disassembled.

The removed air bag module should be stored in a clean, dry place with the deployment surface facing up.

By sliding the A section (in the figure) of the air bag module connector in the arrow direction, disconnect the connector.

<<E>> STEERING WHEEL REMOVAL

Use special tool MB990803 to remove the steering wheel.

<<F>> CLOCK SPRING REMOVAL

WARNING

The removed clock spring should be stored in a clean, dry place.

<<G>> AIR BAG MODULE REMOVAL (FRONT PASSENGER’S SIDE)

WARNING

When the passenger’s air bag module is removed, do not damage the engagement of the pawls.

The removed passenger’s air bag module should be stored in a clean, dry place with facing the deployment surface facing up.

INSTALLATION SERVICE POINTS

>>A<< PRE-INSTALLATION INSPECTION

WARNING

When discarding the air bag module or seat back assembly, deploy the air bag as specified in the service procedure (Refer to

Even new air bag modules, clock spring and front seat back assembly require inspection before installation.

Connect the negative battery cable.

WARNING

Turn the ignition switch to the "LOCK" (OFF) position when connecting and disconnecting the MUT-II/III.

Connect the MUT-II to the diagnosis connector (16- pin).

Turn the ignition switch to the "ON" position.

Read a diagnosis code to refer to that the SRS is operating properly except an open in the air bag module circuit.

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

WARNING

Wait at least 60 seconds after the disconnection of the battery cable before any further job (Refer to

Disconnect the negative battery cable and insulate with tape.

>>B<< CLOCK SPRING INSTALLATION

Confirm that the steering wheel is at the straight-ahead position.

WARNING

Unless the mating marks are properly aligned, the steering wheel gets stuck amid a turn or the flat cable in the clock spring is cut. These hinder the SRS air bag from proper operation, resulting in serious injury to the vehicle's driver.

Align the mating marks of the clock spring.

Turn the clock spring clockwise fully. Then turn it back approximately 3 3/4 turns counterclockwise to align the mating marks.

Then install the clock spring to the column switch.

>>C<< STEERING WHEEL AND AIR BAG MODULE ASSEMBLY INSTALLATION

CAUTION

Be sure when installing the steering wheel, that the harness of the clock spring does not become caught or tangled.

Refer to first that the clock spring has been centered properly. Then, install the steering wheel.

After clamping, turn the steering wheel all the way in both directions to confirm that steering is normal.

>>D<< POST-INSTALLATION INSPECTION

Connect the negative battery cable.

Turn the ignition key to "ON" position.

Does the SRS warning lamp illuminate for about 7 seconds, and then remain extinguished for at least 5 seconds after turning OFF?

If no, refer to troubleshooting (Refer to ).