Circuit Operation

This circuit supplies the power to the vacuum pump. The battery positive voltage is supplied to the auto-cruise control vacuum pump by turning on the transistor at terminal number 16 of the auto-cruise control-ECU. The conditions for turning on the transistor at terminal number 16 of the auto-cruise control-ECU are as follows.

• Ignition switch "ON."
• Auto-cruise control main switch "ON."
• Stoplight switch ON.