Main Body ECU Communication Stop Mode [10/2014 - 09/2017]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Rear view of wire harness connector (to Main Body ECU [Multiplex Network Body ECU])

2. Disconnect the 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
   I48-14 (CANH) - I48-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (MAIN BODY ECU) 

Result: 

OK 

See step  2

1. Reconnect the cable to the negative (-) auxiliary battery terminal.
   NOTE:

   When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

   Refer to INITIALIZATION [10/2014 - 09/2017]

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

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

   Refer to REMOVAL [10/2014 - 05/2019]

3. Reconnect the 4A, 4C, 4D and 4F instrument panel junction block assembly connectors.
4. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A-31 (BECU) - Body ground	Power switch off	11 to 14 V
   A-32 (IG) - Body ground	Power switch on (IG)	11 to 14 V
   A-30 (ACC) - Body ground	Power switch on (ACC)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A-11 (GND1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

NG 

See step  3

1. Disconnect the instrument panel junction block assembly connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Front view of wire harness connector (to Instrument Panel Junction Block Assembly)

   -

   -

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   4A-27 - Body ground	Power switch off	11 to 14 V
   4F-1 - Body ground	Power switch off	11 to 14 V
   4C-28 - Body ground	Power switch on (ACC)	11 to 14 V
   4C-44 - Body ground	Power switch on (IG)	11 to 14 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4D-9 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2014 - 05/2019] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR