Vehicle Speed Signal Circuit between Stereo Component Amplifier and Combination Meter: Description

The stereo component amplifier assembly (No. 3 meter circuit plate) receives a vehicle speed signal from the combination meter assembly (No. 3 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 combination meter assembly (No. 3 meter circuit plate). The signal is changed to a pulse signal at the transistor in the combination meter assembly (No. 3 meter circuit plate). Each ECU controls the respective systems based on the pulse signal.
• If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the diagram below will not operate normally.