Main Body ECU Communication Stop Mode [09/2022 - 11/2022]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the I85 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
   I85-2 (CANH) - I85-1 (CANL)	Cable disconnected from negative (-) battery terminal	108 to 132 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Main Body ECU (Multiplex Network Body ECU))

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN MAIN 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 [09/2022 - 11/2022]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Power Distribution Box Assembly

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MB-13 (GND1) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω
   MB-14 (GND2) - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   NOTE:

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

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
   MB-26 (BECU) - Body ground	Always	11 to 14 V

   NOTE:

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

   Result

   Result	Proceed to
   OK	A
   NG (BECU)	B
   NG (GND1 or GND2)	C

Result: 

A 

CHECK ECU POWER SOURCE CIRCUIT 

Refer to IG Signal Circuit [09/2022 - 11/2022]

Result: 

C 

See step  4

Result: 

B 

See step  3

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the 8F 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.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Power Distribution Box Assembly)

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   8F-23 - Body ground	Always	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

Refer to REMOVAL [09/2022 - 11/2022]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BECU SIGNAL CIRCUIT) 

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the 8D power distribution box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   8D-1 - Body ground	Cable disconnected from negative (-) battery terminal	Below 1 Ω

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Power Distribution Box Assembly)

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY 

Refer to REMOVAL [09/2022 - 11/2022]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT)