Main Body ECU Communication Stop Mode [10/2022 - ]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the C45 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
   C45-2 (CANH) - C45-1 (CANL)	Cable disconnected from negative (-) 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 [10/2022 - 08/2023] , or refer to REMOVAL [08/2023 - ]

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   z31-26 (BECU) - Body ground	Always	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 [10/2022 - ] 

Result: 

NG 

See step  3

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the A71 power distribution box assembly connector.
3. Reconnect the cable to the negative (-) battery terminal.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A71-1 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT) 

Result: 

OK 

See step  4

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the C90 power distribution box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C90-11 - C90-34	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT)