Only Back Door cannot be Opened [11/2023 - ]: Procedure

1. Perform the Active Test according to the display on the GTS.

   Body Electrical > Main Body > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   Trunk Lid / Back Door Open	Back door lock motor	OFF/ON	-

   Body Electrical > Main Body > Active Test 

   Tester Display
   Trunk Lid / Back Door Open

   OK

   The back door lock assembly with courtesy light switch unlatches when ON is selected.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO SMART KEY SYSTEM (for Entry Function). Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ] 

Result: 

NG 

See step  2

Refer to INSPECTION [12/2019 - ]

Result

Result: 

NG 

REPLACE BACK DOOR LOCK WITH COURTESY LIGHT SWITCH ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

Result: 

OK 

See step  3

1. Disconnect the W12 back door lock with courtesy light switch assembly connector.
2. Disconnect the 8G power distribution box assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   W12-1 (ACT+) - 8G-39	Always	Below 1 Ω
   W12-3 (D+) - 8G-2	Always	Below 1 Ω
   W12-2 (ACT-) - Body ground	Always	Below 1 Ω
   W12-1 (ACT+) - Body ground	Always	10 kΩ or higher
   8G-39 - Body ground	Always	10 kΩ or higher
   W12-3 (D+) - Body ground	Always	10 kΩ or higher
   8G-2 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Remove the power distribution box assembly.

   Refer to REMOVAL [11/2023 - ]

2. Remove the main body ECU (multiplex network body ECU) from the power distribution box assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Power Distribution Box Assembly)

   -

   -

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   MB-19 (BCTY) - 8G-2	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE POWER DISTRIBUTION BOX ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  5

1. Disconnect the 8H power distribution box assembly connectors.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   8H-1 - Body ground	Ignition switch off	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Refer to REMOVAL [11/2023 - ]

Result

Result: 

NEXT 

See step  7

1. Check that the back door open function operates.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [11/2023 - ]