Toyota CH-R Service Manual: Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter

for Automatic Sound Levelizer (ASL):

• This circuit is necessary for the Automatic Sound Levelizer (ASL) built into the radio receiver assembly.

  The Automatic Sound Levelizer (ASL) function automatically adjusts the audio system volume level in order to compensate for increased vehicle noise (vehicle noise tends to increase as vehicle speed increases). The ASL adjusts the volume level based upon vehicle speed signals sent from the combination meter assembly.

for "Bluetooth":

• Vehicle speed signals are received from the combination meter assembly and used to cancel "Bluetooth" function operation.

  The radio receiver assembly recognizes that the vehicle is being driven and makes it impossible to connect or register a "Bluetooth" device while driving.

HINT:

• A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective system based on this pulse signal.
• If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.

USB Audio System Recognition/Play Error

DESCRIPTION When a USB device or "iPod" is connected to the USB connector of the radio receiver assembly, it must have playable files. The device must also communicate with and be recog ...

Steering Pad Switch Circuit

DESCRIPTION This circuit sends an operation signal from the steering pad switch assembly to the radio receiver assembly. If there is an open in the circuit, the audio system cannot be operated usi ...

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