IG Signal Circuit [11/2016 - ]: Procedure

1. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [11/2016 - ]

   Body Electrical > Power Source Control > Clear DTCs 

2. Check for DTCs.

   Refer to DTC CHECK / CLEAR [11/2016 - ]

   Body Electrical > Power Source Control > Trouble Codes 

   Result

   Result	Proceed to
   Smart Key System (for Start Function) DTCs are not output	A
   Smart Key System (for Start Function) DTCs are output	B

Result:  2

B 

GO TO SMART KEY SYSTEM (for Start Function). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2014 - ] 

Result:  1

A 

See step  2

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 Data List according to the display on the Techstream.

   Body Electrical > Main Body > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   IG SW	Power switch on (IG) signal	ON or OFF	ON: Power switch on (IG) OFF: Power switch off	"OFF" is also displayed for this item when the power switch is on (ACC).

   Body Electrical > Main Body > Data List 

   Tester Display
   IG SW

   OK

   Normal conditions listed above are displayed.

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [02/2014 - ]  

Result:  2

NG 

See step  3

1. Disconnect the 4K instrument panel junction block assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   4K-1 - Body ground	Power switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result:  3

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  4

1. Disconnect the 4F instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4F-19 - 4F-24	Always	Below 1 Ω
   4F-19 or 4F-24 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result:  2

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result:  1

OK 

See step  5

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [11/2016 - ]

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

   Refer to REMOVAL [11/2016 - ]

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4K-1 - 4F-19	Auxiliary battery not connected to 4A-16 and 4A-27	10 kΩ or higher
   4K-1 - 4F-19	Auxiliary battery positive (+) → 4A-16 Auxiliary battery negative (-) → 4A-27	Below 1 Ω
   4F-24 - MB-32 (IG)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result:  1

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2016 - ] 

Result:  2

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [11/2016 - ]