Toyota Prius 2010 Repair Manual page 401

Communication Circuit between Solar Ventilation ECU and A/C Amplifier
DESCRIPTION
The solar ventilation ECU communicates with the A/C amplifier using a direct line. The A/C amplifier checks
the condition of the solar ventilation system based on signals sent via the direct line.
When this circuit malfunctions, Data List items for the solar ventilation system will not be displayed.
WIRING DIAGRAM
INSPECTION PROCEDURE
PROCEDURE
1. CHECK HARNESS AND CONNECTOR (SOLAR VENTILATION ECU - A/C AMPLIFIER)
(a) Disconnect the solar ventilation ECU connector.
2010 Toyota Prius Repair Manual