Power Source Mode does not Change to ON (IG) [09/2014 - ]: Procedure

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

   Body Electrical > Power Source Control > Trouble Codes 

   Body Electrical > Smart Access > Trouble Codes 

   Body Electrical > Starting Control > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   Smart access system with push-button start (for Start Function) DTCs are output	B

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2014 - 10/2015]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2015 - 11/2017]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2017 - 11/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [11/2019 - 10/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2022 - ] 

Result: 

A 

See step  2

1. Disconnect the A13 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 4B and 4C 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
   A13-3 (IG1D) - 4C-22	Always	Below 1 Ω
   4B-7 - Body ground	Always	Below 1 Ω
   A13-3 (IG1D) or 4C-22 - 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 2E semiconductor pwr integration ECU connector.
2. Disconnect the 4C 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
   4C-11 - 2E-1	Always	Below 1 Ω
   4C-11 or 2E-1 - 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. Disconnect the 4C instrument panel junction block assembly connector.
2. Remove the IG1 MAIN relay.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4C-17 - 1 (IG1 MAIN relay)	Always	Below 1 Ω
   2 (IG1 MAIN relay) - Body ground	Always	Below 1 Ω
   4C-17 or 1 (IG1 MAIN relay) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [09/2014 - ]

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
   4C-22 - 4B-7	20°C (68°F)	87.32 to 127.14 Ω
   4E-1 - 4A-16	Battery voltage applied between terminals 4C-22 and 4B-7	Below 1 Ω
   	Battery voltage not applied between terminals 4C-22 and 4B-7	10 kΩ or higher
   4E-1 - 4A-35	Battery voltage applied between terminals 4C-22 and 4B-7	Below 1 Ω
   	Battery voltage not applied between terminals 4C-22 and 4B-7	10 kΩ or higher
   4E-1 - 4B-32	Battery voltage applied between terminals 4C-22 and 4B-7	Below 1 Ω
   	Battery voltage not applied between terminals 4C-22 and 4B-7	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  6

1. Remove the semiconductor pwr integration ECU.

   Refer to REMOVAL [09/2014 - ]

2. Inspect the semiconductor pwr integration ECU.

   Refer to INSPECTION [09/2014 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU (IG2 RELAY). Refer to  REMOVAL [09/2014 - ] 

Result: 

OK 

See step  7

1. Remove the IG1 MAIN relay.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3 - 5	Battery voltage applied between terminals 1 and 2	Below 1 Ω
   	Battery voltage not applied between terminals 1 and 2	10 kΩ or higher

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	IG1 MAIN Relay

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE IG1 MAIN RELAY 

Result: 

OK 

See step  8

1. Reconnect the A13 certification ECU (smart key ECU assembly) connector.
2. Install the instrument panel junction block assembly.

   Refer to INSTALLATION [09/2014 - ]

3. Install the semiconductor pwr integration ECU.

   Refer to INSTALLATION [09/2014 - ]

4. Install the IG1 MAIN relay.
5. 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
   A13-3 (IG1D) - Body ground	Engine switch on (ACC) → Engine 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 [09/2014 - 10/2015]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - 11/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2017 - 10/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2018 - 11/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2019 - 09/2020]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2020 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

NG 

REPLACE SMART KEY ECU ASSEMBLY (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [09/2014 - ]