IG Signal Circuit: Procedure

1. Check for DTCs. Refer to DTC CHECK / CLEAR
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → See step   8 

A: Go to next step 

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 / Main Body / Data List.
5. Read the display on the Techstream.
   MAIN BODY
   
   

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

   OK

   Normal conditions listed above are displayed.

NG → See step   3 

OK → See step   5 

1. Disconnect the 2E 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
   2E-1 - Body ground	Power switch off	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly. Refer to REMOVAL .
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Measuring Resistance Of Instrument Panel Junction Block Assembly

   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
   2E-1 - MB-32 (IG)	Always	10 kΩ or higher
   2E-1 - MB-32 (IG)	Auxiliary battery positive (+) → 2B-25 Auxiliary battery negative (-) → 2B-6, 2B-4	Below 1 Ω

NG → See step   6 

OK → See step   7