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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 with the pad cover facing upward. Do not place anything on top of it.
  • Do not expose the air bag modules to temperatures over 93°C (200°F).
  • After the air bag deployment, replace the air bag module with a new one. 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.
  • Certain components of this vehicle, such as air bag modules and seat belt pre-tensioners, may contain perchlorate materials. Before deployment and/or disposal of these components, review and comply with all applicable Federal, state and local regulations.
  • An undeployed air bag module should only be disposed of in accordance with the procedures (Refer to ).
  • When removing and installing the front passenger seat, be sure to carry out accuracy check of the occupant classification sensor after the seat has been installed in the vehicle (On-Vehicle Service ).
  • After the installation, perform a calibration for the ASC-ECU to learn the steering wheel sensor neutral point. (Refer to GROUP 35C, On-vehicle Service - Steering Wheel Sensor Calibration ).
 
 
Pre-removal operation
  • Check that the front wheels are at the straight-ahead position.
Driver's air bag module removal steps
<<A>>1.Negative (-) battery cable
<<B>>2.Driver's air bag module
<<C>>3.Driver's air bag module connector
4.Horn wiring harness
Driver's air bag module installation steps
>>A<<•Pre-installation inspection
4.Horn wiring harness
3.Driver's air bag module connector
>>C<<2.Driver's air bag module
>>D<<•Post-installation inspection
Clock spring removal steps
<<A>>1.Negative (-) battery cable
<<B>>2.Driver's air bag module
<<C>>3.Driver's air bag module connector
4.Horn wiring harness
<<D>>5.Steering wheel assembly
•Steering column lower, upper cover (Refer to GROUP 37 -Steering Column Shaft Assembly ).
<<E>>6.Clock spring
•Steering wheel sensor (Refer to Group 35C - Steering Wheel Sensor ).
Clock spring installation steps
>>A<<Pre-installation inspection
•Steering wheel sensor (Refer to GROUP 35C - Steering wheel sensor ).
>>B<<6.Clock spring
•Steering column lower, upper cover (Refer to GROUP 37 - Steering Column Shaft Assembly ).
>>C<<5.Steering wheel assembly
4.Horn wiring harness
3.Driver's air bag module connector
2.Driver's air bag module
>>D<<•Post-installation inspection
Required Special Tools:
  • MB990784: Ornament Remover
  • MB990803: Steering Wheel Puller
  • MB991958 Scan Tool (M.U.T.-III Sub Assembly)
    • MB991824: Vehicle Communication Interface(V.C.I.)
    • MB991827: M.U.T.-III USB Cable
    • MB991910: M.U.T.-III Main Harness A
  • MB992006: Extra Fine Probe
 
 
REMOVAL SERVICE POINTS
 
 
<<A>> NEGATIVE (-) BATTERY CABLE DISCONNECTION
dangerWait at least 60 seconds after disconnecting the battery cable before doing any further work (Refer to ).
warningBattery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.
Disconnect the negative (-) battery cable from the battery and tape the terminal to prevent accidental connection and air bag(s) deployment.
 
 
 
<<B>> 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 ).
Follow the procedure below according to the item numbers in the illustration.
1. Insert a TORX (screw)driver (T-30) into the service hole on the steering wheel assembly.
2. Use the TORX (screw)driver (T-30) to press the rod in driver’s air bag module.
3. When the driver’s air bag module is disengaged, the driver’s air bag module will be released.
4. Repeat for the other service hole end then remove the driver’s air bag module.
 

 
 
<<C>> DRIVER'S AIR BAG MODULE CONNECTOR REMOVAL
Use the flat-tipped screwdriver to pull out the locking button of wiring harness side connector, and release the lock.
 

 
 
<<D>> STEERING WHEEL ASSEMBLY REMOVAL
1.
cautionUse 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
cautionThe removed clock spring should be stored in a clean, dry place.
Lift the connector lock of clock spring connector to the direction of the arrow, then unlock and disconnect the connector.
 
 
 
 
INSTALLATION SERVICE POINTS
 
 
>>A<< PRE-INSTALLATION INSPECTION
1.
warningDispose of air bag modules only according to the specified procedure (Refer to ).
When installing the new air bag modules and clock spring, refer to “INSPECTION” ().
2. Connect the negative (-) battery cable.
3.
cautionTo prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
Connect scan tool MB991958 to the data link connector.
4. Turn the ignition switch to the “ON” position.
5. Check DTCs using scan tool MB991958 to ensure entire SRS operates properly.
At this time, check that no DTC except B1401 and B1481 are stored.
6.
dangerWait at least 60 seconds after disconnecting the battery cable before doing any further work (Refer to ).
warningBattery posts, terminals and related accessories contain lead and lead compounds. WASH HANDS AFTER HANDLING.
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. Confirm that the front wheel is at the straight-ahead position.
2.
caution
  • If the center 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)
cautionDo not rotate the clock spring 2.5 turns or more clockwise from the neutral position, or a malfunction may occur.
Turn the clock spring counterclockwise fully.
(2) Rotate the clock spring approximately 3.6 turns clockwise to align the mating marks.
(3) Check that the white cable can be seen from the both window for checking the neutral point when the mating marks are aligned.
noteIf the white or black cable can be seen from either window, the neutral point is not aligned correctly.
(4) Install the clock spring to the column switch.
 

 
 
>>C<< STEERING WHEEL ASSEMBLY INSTALLATION
1.
cautionWhen installing the steering wheel assembly, do not trap the clock spring harness.
After checking that the clock spring center alignment is already performed, install the steering wheel assembly so that its boss part is aligned with the rib of the clock spring slowly.
2. After the installation, check that there is no abnormality when the steering wheel is fully turned to left and right.
 

 
 
>>D<< POST-INSTALLATION INSPECTION
1. Reconnect the negative (-) battery cable.
2. Turn the ignition switch to the "ON" position.
3. Does the "SRS" warning light illuminate for approximately seven seconds, and go out?
4. If yes, the SRS system is functioning properly. If not, refer to .