CAUTION / NOTICE / HINT HINT: When the "iPhone" is connected to the USB port of the No. 1 stereo jack adapter, Entune audio may not be output. Before performing troubleshooting, disconnect the "iPhone" connected to the USB port of the No. 1 stereo jack adapter, change the audio output source of the "iPhone" or turn the ignition switch off and then ON again. PROCEDURE
(a) In sound output setting mode, set volume, fader and balance to the initial values and check that the sound is normal. OK: Audio system returns to normal. HINT: Sound quality adjustment measures vary according to the type of amplifier.
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Toyota Tundra Service Manual > Can Communication System: Lost Communication with Tilt and Telescopic Module (U1115)
DESCRIPTION DTC No. DTC Detection Condition Trouble Area U1115 There is no communication from the multiplex tilt and telescopic ECU. Outer multiplex tilt and telescopic ECU CAN branch wire or connector Power source or inside of multiplex tilt and telescopic ECU Multiplex tilt and telescopic ECU grou ...