Power Source Mode does not Change to ON (IG) [11/2015 - ]: Procedure

1. Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs.

   Body Electrical > Power Source Control > Trouble Codes 

   Body Electrical > Smart Key > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   Smart key system (for Start Function) DTCs are output	B

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2015 - 07/2020]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [07/2020 - ] 

Result: 

A 

See step  2

1. Disconnect the F1 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 3A and 3D instrument panel junction block assembly connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F1-17 (IG1D) - 3A-17	Always	Below 1 Ω
   3D-3 - Body ground	Always	Below 1 Ω
   F1-17 (IG1D) or 3A-17 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the 1A No. 1 integration relay connector.
2. Disconnect the 3F instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3F-12 - 1A-2	Always	Below 1 Ω
   3F-12 or 1A-2 - Body ground	Always	10 kΩ or higher
   3F-13 - 1A-7	Always	Below 1 Ω
   3F-13 or 1A-7 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [11/2015 - 12/2018] , or refer to REMOVAL [12/2018 - 07/2020] , or refer to REMOVAL [07/2020 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-17 - 3D-3	20°C (68°F)	130.92 to 190.69 Ω
   3K-1 - 3A-35	Auxiliary battery voltage applied between terminals 3A-17 and 3D-3	Below 1 Ω
   	Auxiliary battery voltage not applied between terminals 3A-17 and 3D-3	10 kΩ or higher
   3K-1 - 3H-12	Auxiliary battery voltage applied between terminals 3A-17 and 3D-3	Below 1 Ω
   	Auxiliary battery voltage not applied between terminals 3A-17 and 3D-3	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020]  , or refer to  REMOVAL [07/2020 - ] 

Result: 

OK 

See step  5

1. Remove the No. 1 integration relay.

   Refer to REMOVAL [11/2015 - 12/2018] , or refer to REMOVAL [12/2018 - 07/2020] , or refer to REMOVAL [07/2020 - ]

2. Inspect the No. 1 integration relay.

   Refer to INSPECTION [11/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY (IG2 NO. 1, IG1 NO. 3 RELAY). Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020]  , or refer to  REMOVAL [07/2020 - ] 

Result: 

OK 

See step  6

1. Reconnect the F1 certification ECU (smart key ECU assembly) connector.
2. Install the instrument panel junction block assembly.

   Refer to INSTALLATION [11/2015 - ]

3. Install the No. 1 integration relay.

   Refer to INSTALLATION [11/2015 - ]

4. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   F1-17 (IG1D) - Body ground	Power switch on (ACC) → Power switch on (IG)	1 V or less → 9 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - 12/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2018 - 07/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2020 - 06/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2021 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2015 - 12/2018]  , or refer to  REMOVAL [12/2018 - 07/2020]  , or refer to  REMOVAL [07/2020 - ]