Power Source Mode does not Change to ON (IG) [08/2019 - ]: Procedure

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

   Refer to DTC CHECK / CLEAR [08/2019 - ]

   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 [08/2019 - 08/2021]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2021 - 08/2022]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2022 - ] 

Result: 

A 

See step  2

1. Disconnect the F114 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 2N and 2O driver side junction block assembly connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F114-3 (IG1D) - 2N-22	Always	Below 1 Ω
   2O-1 - Body ground	Always	Below 1 Ω
   F114-3 (IG1D) or 2N-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 F114 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 1M No. 1 Integration Relay connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F114-3 (IG1D) - 1M-2	Always	Below 1 Ω
   F114-3 (IG1D) or 1M-2 - 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 driver side junction block assembly.

   Refer to REMOVAL [08/2019 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Driver Side Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2N-22 - 2O-1	20°C (68°F)	87.32 to 127.14 Ω
   2K-1 - 2Q-36	Battery voltage applied to terminals 2N-22 and 2O-1	Below 1 Ω
   	Battery voltage not applied to terminals 2N-22 and 2O-1	10 kΩ or higher
   2K-1 - 2N-42	Battery voltage applied to terminals 2N-22 and 2O-1	Below 1 Ω
   	Battery voltage not applied to terminals 2N-22 and 2O-1	10 kΩ or higher
   2K-1 - 2O-22	Battery voltage applied to terminals 2N-22 and 2O-1	Below 1 Ω
   	Battery voltage not applied to terminals 2N-22 and 2O-1	10 kΩ or higher
   2K-1 - 2N-2	Battery voltage applied to terminals 2N-22 and 2O-1	Below 1 Ω
   	Battery voltage not applied to terminals 2N-22 and 2O-1	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  5

1. Remove the No. 1 integration relay.
2. Inspect the No. 1 integration relay.

   Refer to ON-VEHICLE INSPECTION [08/2019 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY (IG2 RELAY) 

Result: 

OK 

See step  6

1. 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
   F114-3 (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 [08/2019 - ] 

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [08/2019 - ]