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

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Smart Key, Power Source Control / Trouble Codes.
5. Check for 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 - ] 

Result: 

A 

See step  2

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	Switch Condition	Specified Condition
   H197-3 (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: 

NG 

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

Result: 

OK 

See step  3

1. Disconnect the H197 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 3F, 3G, 3H, 3I and 3J cowl side junction block LH connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H197-3 (IG1D) - 3J-17	Always	Below 1 Ω
   3I-3 - Body ground	Always	Below 1 Ω
   H197-3 (IG1D) or 3J-17 - Other terminals and body ground	Always	10 kΩ or higher

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3G-1 - Body ground	Always	11 to 14 V
   3F-1 - Body ground	Always	11 to 14 V

5. Reconnect the H197 certification ECU (smart key ECU assembly) connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the cowl side junction block LH.

   Refer to REMOVAL [08/2019 - ]

2. Reconnect the cowl side junction block LH connectors.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3J-17 - 3H-12	Always	Below 1 Ω

4. Connect a positive (+) lead from the battery to terminal 3J-17.
5. Connect a negative (-) lead from the battery to terminal 3I-3.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3G-1 - 3H-31	Always	Below 1 Ω
   3G-1 - 3H-2	Always	Below 1 Ω
   3F-1 - 3I-19	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE COWL SIDE JUNCTION BLOCK LH. Refer to  REMOVAL [08/2019 - ] 

Result: 

OK 

See step  5

1. Disconnect the 3H cowl side junction block LH connector.
2. Remove the No. 1 integration relay (IG2).
3. Remove the IG1 NO. 4 relay.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   NO. 1 INTEGRATION RELAY (IG2)
   
   

   Tester Connection	Condition	Specified Condition
   3H-12 - 2B-6	Always	Below 1 Ω
   2B-7 - Body ground	Always	Below 1 Ω
   3H-12 or 2B-6 - Other terminals and body ground	Always	10 kΩ or higher

   IG1 NO. 4 RELAY
   
   

   Tester Connection	Condition	Specified Condition
   3H-12 - IG1 NO. 4 relay installation terminal 1	Always	Below 1 Ω
   IG1 NO. 4 relay installation terminal 2 - Body ground	Always	Below 1 Ω
   3H-12 or IG1 NO. 4 relay installation terminal 1 - Other terminals and body ground	Always	10 kΩ or higher

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

   Standard Voltage

   NO. 1 INTEGRATION RELAY (IG2)
   
   

   Tester Connection	Condition	Specified Condition
   2C-1 - Body ground	Always	11 to 14 V

   IG1 NO. 4 RELAY
   
   

   Tester Connection	Condition	Specified Condition
   IG1 NO. 4 relay installation terminal 3 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Inspect the No. 1 integration relay (IG2).

   Refer to ON-VEHICLE INSPECTION [08/2015 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 1 INTEGRATION RELAY (IG2) 

Result: 

OK 

See step  7

1. 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 NO. 4 Relay

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2019 - ] 

Result: 

NG 

REPLACE IG1 NO. 4 RELAY