Power Source Mode does not Change to ON (ACC) [10/2017 - 10/2020]: Procedure

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 / Smart Access, Power Source Control / Trouble Codes.
5. Check for DTCs.

   Body Electrical > Smart Access > Trouble Codes 

   Body Electrical > Power Source 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 [10/2017 - 09/2019]  , or refer to  DIAGNOSTIC TROUBLE CODE CHART [09/2019 - 10/2020] 

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
   G71-16 (ACCD) - Body ground	Power switch off → Power switch on (ACC)	1 V or less → 8.5 V or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

OK 

See step  3

1. Disconnect the G71 certification ECU (smart key ECU assembly) connector.
2. Disconnect the 5D and 5K 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
   G71-16 (ACCD) - 5D-17	Always	Below 1 Ω
   5D-6 - Body ground	Always	Below 1 Ω
   G71-16 (ACCD) or 5D-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
   5K-1 - Body ground	Power switch off	11 to 14 V

   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 [10/2017 - 09/2018] , or refer to REMOVAL [09/2018 - 10/2020]

2. Reconnect the driver side junction block assembly connectors.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component with harness connected (Driver Side Junction Block Assembly)

   -

   -

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   5D-22 - Body ground	power switch on (ACC)	11 to 14 V
   5A-18 - Body ground	power switch on (ACC)	8.5 to 14 V
   5H-32 - Body ground	power switch on (ACC)	8.5 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE DRIVER SIDE JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2017 - 09/2018]  , or refer to  REMOVAL [09/2018 - 10/2020] 

Result: 

OK 

See step  5

1. Disconnect the 5A driver side junction block assembly connector.
2. Disconnect the 4D, 4A and 4K passenger 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
   5A-18 - 4D-26	Always	Below 1 Ω
   4A-9 - Body ground	Always	Below 1 Ω
   5A-18 or 4D-26 - 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
   4K-1 - Body ground	Power switch off	11 to 14 V

5. Reconnect the 3A driver side junction block assembly connector.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Remove the passenger side junction block assembly.

   Refer to REMOVAL [10/2017 - 10/2020]

2. Reconnect the passenger side junction block assembly connectors.
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component with harness connected (Passenger Side Junction Block Assembly)

   -

   -

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   4D-27 - Body ground	Power switch on (ACC)	11o 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE PASSENGER SIDE JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2017 - 10/2020] 

Result: 

OK 

See step  7

1. Disconnect the 5H driver side junction block assembly connector.
2. Remove the LUG-ACC relay.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   5H-32 - LUG-ACC relay installation terminal 2	Always	Below 1 Ω
   LUG-ACC relay installation terminal 1 - Body ground	Always	Below 1 Ω
   5H-32 or LUG-ACC relay installation terminal 2 - 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
   LUG-ACC relay installation terminal 3 - Body ground	Power switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  8

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

   Standard Resistance

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	LUG-ACC Relay

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2018 - 09/2019]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2019 - 10/2020] 

Result: 

NG 

REPLACE LUG-ACC RELAY