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Steering switch inspection

Launch the diagnostic assist function. (See ACTIVATION PROCEDURE .)
Select in the following order from the diagnostic assist function initial screen.
1. [Functional Inspection/Adjustment]
2. [Steering SW Inspection]

Verify if the indication on the center display changes correctly in conjunction with the steering switch operation.

NOTE:

If the switch operation content previously detected is being displayed in the center display, newly detected content is added over it.

STEERING SWITCH OPERATION DESCRIPTION

Steering switch operation	Indication on center display	Action
Volume adjustment button (-) is pressed	Vol. down SW Pressed	Inspect the following if the indication on the center display does not operate correctly in conjunction with the steering switch operation. Steering switch related DTCs (See DTC TABLE [AUDIO CONTROL UNIT (ACU)] .) Steering switch related symptom troubleshooting Steering switch (Refer to [STEERING SWITCH INSPECTION ] in workshop manual) Clock spring (Refer to [CLOCK SPRING INSPECTION] in workshop manual) Wiring harness between steering switch and audio control unit (ACU)
Volume adjustment button (-) is released from it pressed	Vol. down SW Released
Volume adjustment button (+) is pressed	Vol. up SW Pressed
Volume adjustment button (+) is released	Vol. up SW Released
SEEK (+) switch is pressed	→ SW Pressed
SEEK (+) switch is released	→ SW Released
SEEK (-) switch is pressed	→ SW Pressed
SEEK (-) switch is released	← SW Released
MUTE button is pressed	Mute SW Pressed
MUTE button is released	Mute SW Released
PICK-UP button is pressed	Pick-up SW Pressed
PICK-UP button is released	Pick-up SW Released
HANG-UP button is pressed	Hang-up SW Pressed
HANG-UP button is released	Hang-up SW Released
SOURCE button is pressed	Source SW Pressed
SOURCE button is released	Source SW Released

Ends the diagnostic assist function. (See ENDING PROCEDURE .)