DTC U0230: Lost Communication with Rear Gate Module (2016 - 2017): Procedure

1. Reconfirm DTCs.

   HINT: 

   If DTC U1002 is output from Main Body of the main body ECU, this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

   Result

   Result	Proceed to
   U1002 is not output from main body ECU (Techstream display: Main Body)	A
   U1002 is output from main body ECU (Techstream display: Main Body)	B

Result:  B

B 

Go To Diagnosis Procedure Indicated By Output DTC 

(efer to DTC U1002: Lost Communication with Gateway Module (Main Body ECU) (2016 - 2017) )

Result:  A

A 

See step  2

1. Disconnect the cable from the negative (-) auxiliary battery terminal.
2. Disconnect the U16 luggage closer motor assembly 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
   U16-6 (CANP) - U16-5 (CANN)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Luggage Closer Motor Assembly)

Result:  NG

NG 

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (LUGGAGE CLOSER MOTOR ASSEMBLY) 

Result:  OK

OK 

See step  3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   U16-11 (GND) - Body ground	Cable disconnected from negative (-) auxiliary battery terminal	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Luggage Closer Motor Assembly)

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

Result:  OK

OK 

See step  4

1. Connect the cable to the negative (-) auxiliary battery terminal.
2. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   U16-10 (ECUB) - Body ground	Always	11 to 14 V
   U16-8 (IG) - Body ground	Power switch on (IG)	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Luggage Closer Motor Assembly)

Result:  OK

OK 

REPLACE LUGGAGE CLOSER MOTOR ASSEMBLY 

(Refer to REMOVAL (2016 - 2017) )

Result:  NG

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)