Bus Buffer ECU Communication Stop Mode [10/2023 - 11/2024]: 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 (-) auxiliary battery terminal.
2. Disconnect the option connector (bus buffer ECU).*

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *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

   Tester Connection	Condition	Specified Condition
   G80-2 (CAN+) - G80-1 (CAN-)	Cable disconnected from negative (-) auxiliary 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.
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.

   for Type A

   Body Electrical > Main Body > Utility 

   Tester Display
   Initialization

   for Type B

   Body Electrical > Main Body > Utility 

   Tester Display
   Initialization

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

   for Type A

   Body Electrical > Main Body > Clear DTCs 

   for Type B

   Body Electrical > Main Body > Clear DTCs 

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

   for Type A

   Body Electrical > Main Body > Trouble Codes 

   for Type B

   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 [10/2023 - ]