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 ...

Other materials:

Toyota CH-R Owners Manual > Engine compartment: Engine oil
With the engine at operating temperature and turned off, check the oil level on the dipstick. ■ Checking the engine oil 1. Park the vehicle on level ground. After warming up the engine and turning it off, wait more than 5 minutes for the oil to drain back into the bottom of the engine. 2. ...

Toyota CH-R Service Manual > Smart Key System(for Start Function): System Description
SYSTEM DESCRIPTION SYSTEM FUNCTION Function Outline Push-button start function When the electrical key transmitter sub-assembly is brought into the vehicle and verified, this function changes the power source or starts the engine when the e ...