ON-BOARD DIAGNOSTIC SYSTEM FUNCTION [HANDS-FREE TELEPHONE (HF/TEL) SYSTEM]

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Self-diagnostic Function

Malfunction detection function

•  The malfunction detection function detects malfunctions occurring in the HF/TEL system.

Memory function

•  The memory function converts a malfunction detected by the malfunction detection function to a DTC and stores it. The error currently occurring is stored as a present malfunction.Up to three DTCs (with audio unit), or six (with car-navigation unit) can be stored as a present malfunction.The error that has previously occurred is stored as a past malfunction.Up to three DTCs (with audio unit), or six (with car-navigation unit) can be stored as a past malfunction. The DTCs, together with the number of times the ignition switch has been turned off after the occurrence of an error (maximum of 255 times), are stored as a past malfunction.

Display function

With audio unit

•  When the self-diagnostic function is activated, the information display displays the DTC stored in the memory.

•  The DTC consists of the following codes and numbers:

―  Malfunction type

―  Number of times the ignition switch has been turned off after the occurrence of an error

―  Device code

―  Error code

•  Refer to the Workshop Manual for the display method.

Current malfunction

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Past malfunction

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With car-navigation unit

•  When the self-diagnostic function is activated, the displays the DTC stored in the memory.

•  The DTC consists of the following codes and numbers:

Error history display screen

―  Error items

―  Current malfunction

―  Number of times the ignition switch has been turned off after the occurrence of an error

―  Detail Switch

Detail display screen

―  Device code

―  Error code

―  Check content

―  Number of times present/past malfunction has occurred

•  Refer to the Workshop Manual for the display method.

Error history display screen

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Detail display screen

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DTC table

Screen display			Inferred cause/verified content
Car-navigation unit		Audio unit
Device code	Error code
26	81	26: Er81	CAN system
	82	26: Er82	Short to power supply in wiring harness between microphone (Input signal) and HF/TEL unit
	83	26: Er83	Short to GND/power supply in microphone power supply circuit
	84	26: Er84	Any of the following is detected: •  The microphone power supply circuit is not connected. •  Open circuit in the microphone input circuit •  Microphone input circuit short to body ground
	85	26: Er85	•  Poor contact in the hands-free telephone switch or hands-free telephone unit (HF/TEL unit) connector •  Voice recognition/hands-free switch malfunction
	86	26: Er86	HF/TEL unit malfunction
No Error		no Err	DTC is not recorded.

Diagnostic Assist Function

With audio unit

•  The diagnostic assist function displays the operating condition of the following functions (components) and forces them to operate in order to examine whether they are malfunctioning or not.

•  For the start procedure of each mode, refer to the Workshop Manual.

Software version verification

•  Displays the software version on the information display.

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Connection condition verification

•  Displays the connection status on the information display and examines the HF/TEL system-related unit, wiring harness, and connector.

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Password reset

•  Operate the switch and reset the password.

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With car-navigation unit

•  Input a diagnostic assist code and display the unit’s operation conditions, or force the operation to examine the integrity of functions (parts).

•  For start-up methods of each mode, refer to the Workshop Manual.

Diagnostic assist code table