Main Body ECU Communication Stop Mode [10/2015 - ]: Procedure

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the D6 main body ECU (multiplex network body ECU) connector.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D6-14 (CANH) - D6-13 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) 

Result: 

OK 

See step  2

1. Disconnect the 3B instrument panel junction block assembly connector.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3B-7 - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

3. Disconnect the 3D instrument panel junction block assembly connector.
4. Reconnect the cable to the negative (-) auxiliary battery terminal.
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   3D-27 - Body ground	Power switch off	11 to 14 V

   Result

   Result
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

Result: 

OK 

See step  3

1. Remove the instrument panel junction block assembly.

   Refer to REMOVAL [10/2015 - ]

2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

   Refer to REMOVAL [10/2015 - ]

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3D-27 - MB-30 (BECU)	Always	Below 1 Ω
   3B-7 - MB-11 (GND1)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2015 - ] 

Result: 

OK 

See step  4

1. Inspect the IG1 NO. 2 relay and ACC NO. 1 relay of the instrument panel junction block assembly.
   • IG signal circuit:

     Refer to IG Signal Circuit [10/2015 - ]

   • ACC signal circuit:

     Refer to ACC Signal Circuit [10/2015 - ]

   HINT: 

   If the IG signal circuit and ACC signal circuit have no problem, replace the main body ECU (multiplex network body ECU).

   Result

   Result
   OK
   NG

Result: 

OK 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [10/2015 - ] 

Result: 

NG 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY. Refer to  REMOVAL [10/2015 - ]