IG Signal Circuit: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
5. Check the value(s) by referring to the table below.
   AIR CONDITIONER
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Solar IG Status	Solar ventilation ECU IG status / OFF or ON	OFF: Power switch off ON: Power switch on (IG)	When OFF is displayed, a malfunction in the solar ventilation ECU is suspected.

   OK

   The display is as specified in the Normal Condition column.

   Result

   Result	Proceed to
   NG	A
   OK (When troubleshooting according to Problem Symptoms Table (for Solar Ventilation System))	B
   OK (When troubleshooting according to Problem Symptoms Table (for Air Conditioning System))	C

B → See step   3 

C → See step   5 

A: Go to next step 

1. Disconnect the solar ventilation ECU connector.
   Fig 1: Identifying Harness And Connector (Solar Ventilation ECU - Battery)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   L22-25 (IG) - Body ground	Power switch off	Below 1 V
   L22-25 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *1	Front view of wire harness connector (to Solar Ventilation ECU)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4