IG Signal Circuit [08/2015 - ]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Main Body / Data List.
5. Read the Data List according to the display on the Techstream.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   IG SW	Ignition switch ON signal/ON or OFF	ON: Ignition switch ON OFF: Ignition switch off	-

   OK

   Normal conditions listed above are displayed.

NG → See step   2 

OK → See step   4 

1. Disconnect the 3A, 3B and 3E instrument panel junction block assembly connectors.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3E-1 - Body ground	Always	11 to 14 V
   3A-27 - Body ground	Ignition switch ON	11 to 14 V

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3B-7 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [08/2015 - ] .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument panel junction block assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3E-1 - MB-32 (IG)	Always	10 kΩ or higher
   3E-1 - MB-32 (IG)	Battery positive (+) → 3A-27 Battery negative (-) → 3B-7	Below 1 Ω

NG → See step   5 

OK → See step   6