Audio System - Abnormal Steering Wheel Control Operation
L-SB-0034-08June 9, 2008
Audio Steering Wheel Control Abnormal Operation
Service Category
Audio/Visual/Telematics
Section
Audio/Video
Market
USA
Applicability
Introduction
Some customers may experience a condition with their steering wheel audio controls not working properly. This service bulletin provides the proper procedures for initializing the steering wheel mounted audio controls. When performing any service that requires disconnecting the battery or whenever a Lexus Accessory Dual Mode Phone System is removed from the vehicle the steering wheel mounted audio controls may need to be re-initialized to restore normal operation.
Warranty Information
Components
Initialization Procedure
For vehicles previously equipped with Lexus Accessory Dual Mode phones make sure ALL phone components have been COMPLETELY removed from the vehicle.
NOTE
NOT removing the phone components can prohibit the initialization procedure.
Refer to the Technical Information System (TIS) Accessories Installation:
2001 - 2006 LS 430: 2003 LS 430 Lexus Integrated Mobile Phone System
2003 - 2008 SC 430: 2003 SC 430 Lexus Integrated Mobile Phone System
1. Insert the key in the ignition switch and turn it to the ACC position. Within 30 seconds perform steps 2 and 3.
2. Press and hold the audio MODE switch for more than 10 seconds.
3. After releasing the MODE switch press the channel up switch 3 times and then the channel down switch 3 times within 5 seconds.
NOTE
Make sure you are pressing the channel buttons and NOT the volume buttons.
4. Turn the ignition switch to ON then to the OFF position.
5. Confirm proper operation of the steering wheel controls.
If the initialization procedure above does NOT restore audio operation refer to the applicable model and model year Repair Manual DTC B1285 "Steering Pad Switch Communication", for supporting information on the circuit.