Communication Circuit between Solar Ventilation ECU and A/C Amplifier: Procedure

1. Disconnect the solar ventilation ECU connector.
   Fig 1: Identifying Solar Ventilation ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the A/C amplifier connector.
   Fig 2: Identifying A/C Amplifier Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L22-17 (SIND) - L17-26 (SSLR)	Always	Below 1 Ω
   L22-17 (SIND) - Body ground	Always	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Solar Ventilation ECU)
   *2	Front view of wire harness connector (to A/C Amplifier)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Replace the solar ventilation ECU with a known good one and check if the same problem occurs again. Refer to REMOVAL .

   OK

   Same problem does not occur.

NG → See step   3 

OK → END (SOLAR VENTILATION ECU WAS DEFECTIVE)