Main Body ECU Communication Stop Mode [12/2022 - ]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the K17 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   K17-2 (CANH) - K17-1 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

Result: 

OK 

See step  2

1. Remove the main body ECU (multiplex network body ECU).

   Refer to REMOVAL [12/2022 - 03/2023] , or refer to REMOVAL [03/2023 - ]

2. Reconnect the cable to the negative (-) auxiliary battery terminal.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   z1-26 (BECU) - Body ground	Ignition switch off	11 to 14 V

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Power Distribution Box Assembly

   NOTE:

   Perform this inspection with the wire harness connected to the power distribution box assembly.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK ECU POWER SOURCE CIRCUIT 

Refer to IG Signal Circuit [12/2022 - ]

Result: 

NG 

See step  3

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the A12 power distribution box assembly connector.
3. Reconnect the cable to the negative (-) auxiliary battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A12-23 - Body ground	Ignition switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

Refer to REMOVAL [12/2022 - 03/2023] , or refer to REMOVAL [03/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT)