DTC U0230: Lost Communication with Rear Gate Module: Procedure

1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

   NOTE:

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

NEXT: Go to next step 

1. Disconnect the O15 back door motor unit (power back door ECU) connector.
   Fig 1: Identifying O15 Back Door Motor Unit Power Back Door ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   O15-6 (MPX1) - O15-5 (MPX2)	Ignition switch off	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Back Door Motor Unit [Power Back Door ECU])

NG → REPAIR OR REPLACE POWER BACK DOOR ECU CAN BRANCH WIRE OR CONNECTOR (MPX1, MPX2) 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal.
   Fig 2: Identifying O15 Connector Power Back Door ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

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

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   O15-11 (GND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   O15-8 (IG) - Body ground	Ignition switch ON	11 to 14 V
   O15-10 (ECUB) - Body ground	Always	11 to 14 V
   O15-12 (B) - Body ground	Always	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Rear view of wire harness connector (to Back Door Motor Unit [Power Back Door ECU])

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4