Main Body ECU Communication Stop Mode [08/2015 - ]: Procedure

1. Disconnect the cable from the negative (-) battery terminal.
2. Disconnect the main body ECU (multiplex network body ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I13-14 (CANH) - I13-13 (CANL)	Cable disconnected from negative (-) battery terminal	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (MAIN BODY ECU) 

OK: Go to next step 

1. Disconnect the instrument panel junction block assembly connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3B-7 (GND1) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   3D-31 (BECU) - Body ground	Ignition switch off	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Remove the instrument panel junction block assembly. Refer to REMOVAL [08/2015 - ] .
2. Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Component without harness connected (Instrument Panel Junction Block Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   3E-1 - MB-32 (IG)	Always	10 kΩ or higher
   3E-1 - MB-32 (IG)	Battery positive (+) → 3A-27 Battery negative (-) → 3B-7	Below 1 Ω
   3E-1 - MB-29 (ACC)	Always	10 kΩ or higher
   3E-1 - MB-29 (ACC)	Battery positive (+) → 3B-23 Battery negative (-) → 3B-7	Below 1 Ω

NG → See step   4 

OK → See step   5