Power Source Mode does not Change to ON (ACC) [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 DIAGNOSTIC TROUBLE CODE CHART [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. Disconnect the driver side junction block assembly connector.
   Fig 1: Driver Side Junction Block Connector End View

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to driver side junction block assembly)

2. 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

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Fig 2: Driver Side Junction Block Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the driver side junction block assembly.

   Refer to REMOVAL [08/2019 - ]

2. Remove the main body ECU (multiplex network body ECU) from the driver side junction block assembly.
3. Connect a positive (+) lead from the battery to terminal 3J-30.
4. Connect a negative (-) lead from the battery to terminal 3I-1.
5. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3G-1 - 3J-40	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

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