STEERING PAD REMOVAL

Info Added 2017-10-06

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization, or registration) that must be performed after parts are removed, installed, or replaced during the horn button assembly removal/installation are shown below.

Necessary Procedure After Parts Removed/Installed/Replaced
Replacement Part or Procedure	Necessary Procedures	Effects/Inoperative when not performed	Link
Disconnect cable from negative battery terminal	Memorize steering angle neutral point	Lane departure alert system (w/ Steering Control)	Click here
		Simple intelligent parking assist system*1
		Toyota parking assist-sensor system (w/ Simple Intelligent Parking Assist System)*1
		Pre-collision system
	Initialize back door lock	Power door lock control system	Click here
	Drive the vehicle until stop and start control is permitted (approximately 5 to 60 minutes)*2	Stop and start system	Click here

*1: When performing learning using the GTS.

Click here

*2: w/ Stop and start system

Tech Tips

Use the same procedure for RHD and LHD vehicles.
The following procedure is for LHD vehicles.

PROCEDURE

PRECAUTION

CAUTION:

Be sure to read Precaution thoroughly before servicing.

Click here

Note

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click here
DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL
- for 8NR-FTS:
  
  Click here
- for 3ZR-FAE:
  
  Click here
CAUTION:
- Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
- If an SRS part is accidentally deployed, it may cause a serious injury.
Note

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

REMOVE HORN BUTTON ASSEMBLY

CAUTION:

When storing the horn button assembly, keep the airbag deployment side facing upward.

Deployment Side

Check that the ignition switch off.
Check that the cable is disconnected from the negative (-) battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
Turn the steering wheel assembly 90° to the left.

*a	55 mm (2.17 in.)
*b	95 mm (3.74 in.)
	Protective Tape

Wrap protective tape around a 6 mm hexagon wrench as shown in the illustration.

Tech Tips

Use a 6 mm hexagon wrench with a long arm length of approximately 95 mm (3.74 in.).

*a	Housing Tab
*b	Omega Spring
	Protective Tape

Insert the 6 mm hexagon wrench into the service hole until the protective tape is at the position shown in the illustration.

Tech Tips

Make sure to insert the 6 mm hexagon wrench into the service hole on the backside of the steering wheel assembly.

*a Housing Tab

*b Omega Spring

Using the 6 mm hexagon wrench, push down the housing tab to disengage the hook as shown in the illustration.

Tech Tips

Pushing down the housing tab will push the omega spring and disengage it from the hook.
Turn the steering wheel assembly 180° to the right.

*a	Housing Tab
*b	Omega Spring
	Protective Tape

Insert the 6 mm hexagon wrench into the service hole until the protective tape is at the position shown in the illustration.

Tech Tips

Make sure to insert the 6 mm hexagon wrench into the service hole on the backside of the steering wheel assembly.

*a Housing Tab

*b Omega Spring

Using the 6 mm hexagon wrench, push down the housing tab to disengage the hook as shown in the illustration.

Note

Lightly hold the horn button assembly so that it does not fall.

Tech Tips

Pushing down the housing tab will push the omega spring and disengage it from the hook.
*a Spring

Check that each hook is disengaged.

Tech Tips

If a hook is disengaged, the spring will be visible at the location shown in the illustration.
Turn the steering wheel assembly 90° to the right.
*a Housing Tab

*b Hook

Using a 6 mm hexagon wrench, push the housing tab to disengage the hook as shown in the illustration.

Note

Lightly hold the horn button assembly so that it does not fall.
Tech Tips
- Insert the 6 mm hexagon wrench into the service hole until it contacts the hook and then push down the housing tab while pushing it toward the rear of the vehicle.
- Pushing down the housing tab will disengage it from the hook.
Turn the steering wheel assembly 180° to the left to align the front wheels facing straight ahead.

Note

Do not drop the horn button assembly.
Pull out the horn button assembly from the steering wheel assembly and hold the horn button assembly with one hand.

Note

When separating the horn button assembly, do not pull the airbag wire harness.

for Single Type:

*a	Airbag Connector
*b	Horn Connector
*c	Airbag Connector Lock
*d	Protective Tape
*e	Wire Harness Clamp

Disconnect the horn connector from the horn button assembly.

Using a screwdriver with its tip wrapped in protective tape, release the airbag connector lock.
Disconnect the airbag connector.
Disengage the wire harness clamp to remove the horn button assembly

Note

When disconnecting any airbag connector, take care not to damage the airbag wire harness.

for Dual Type:

*a	Airbag Connector
*b	Horn Connector
*c	Airbag Connector Lock
*d	Protective Tape
*e	Wire Harness Clamp

Disconnect the horn connector from the horn button assembly.

Using a screwdriver with its tip wrapped in protective tape, release the 2 airbag connector locks.
Disconnect the 2 airbag connectors.
Disengage the wire harness clamp to remove the horn button assembly

Note

When disconnecting any airbag connector, take care not to damage the airbag wire harness.