Vehicle Speed Signal Circuit between Radio Receiver and Combination Meter [09/2014 - ]: Description

for DVD function: 

• The radio and display receiver assembly receives a vehicle speed signal from the combination meter assembly for restricting DVD viewing while driving, etc.

for "Bluetooth": 

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

  The radio and display 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.