Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter [09/2016 - 05/2019]: Description

The stereo component amplifier assembly receives a vehicle speed signal from the meter circuit plate to control the ASL function.

HINT: 

• A voltage of 12 V or 5 V is output from each ECU and then input to the meter circuit plate. The signal is changed to a pulse signal at the transistor in the meter circuit plate. Each ECU controls its respective systems 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.