Bus Buffer ECU Communication Stop Mode [11/2018 - 08/2020]: Procedure

1. Check whether dealer installed options that support CAN communication are installed.

   Result

   Result	Proceed to
   Installed	A
   Not installed	B

Result: 

B 

See step  3

Result: 

A 

See step  2

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the option connector (bus buffer ECU).*

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *A	w/o Occupant Classification System
   *B	w/ Occupant Classification System
   *a	Front view of wire harness connector (to Option Connector [Bus Buffer ECU])

   *: When a dealer-installed option is installed

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

   Standard Resistance

   W/O OCCUPANT CLASSIFICATION SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   G80-2 (CANP) - G80-1 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   W/ OCCUPANT CLASSIFICATION SYSTEM
   
   

   Tester Connection	Condition	Specified Condition
   G127-2 (CANP) - G127-1 (CANN)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK DEALER-INSTALLED OPTION 

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.

   *: When a dealer-installed option is installed

3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Central Gateway / Utility / Initialization.

   Body Electrical > Central Gateway > Utility 

   Tester Display
   Initialization

5. Enter the following menus: Body Electrical / Main Body / Utility / Initialization.

   Body Electrical > Main Body > Utility 

   Tester Display
   Initialization

6. Enter the following menus: Body Electrical / Main Body / Clear DTCs.

   Body Electrical > Main Body > Clear DTCs 

7. Enter the following menus: Body Electrical / Main Body / Trouble Codes.

   Body Electrical > Main Body > Trouble Codes 

   Result

   Result	Proceed to
   DTC U1117 is not output from main body ECU (multiplex network body ECU)	A
   DTC U1117 is output from main body ECU (multiplex network body ECU)	B

Result: 

A 

END 

Result: 

B 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) 

Refer to REMOVAL [11/2018 - 02/2019] , or refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]