Power Back Door Warning System does not Operate: Procedure

1. Check the power back door system operation.

   Result

   Result	Proceed to
   Power back door warning buzzer does not operate.	A
   Hazard warning light does not come on.	B
   Power back door warning buzzer in the power back door ECU does not operate.	C

B → See step   5 

C → See step   8 

A: Go to next step 

1. Select the Active Test, use the Techstream to generate a control command, and check that the power back door buzzer sounds.
   BACK DOOR (POWER BACK DOOR ECU)
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   PBD Buzzer	Power back door buzzer sound	ON / OFF	-

   OK

   Buzzer sounds normally.

NG → See step   3 

OK → See step   10 

1. Remove the power back door warning buzzer, refer to REMOVAL
   Fig 1: Identifying Power Back Door Warning Buzzer Connector Terminals

   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
   1 - 2	Always	950 to 1050 Ω

NG → See step   9 

OK: Go to next step 

1. Disconnect the T9 buzzer connector.
   Fig 2: Identifying Power Back Door Warning Buzzer And Power Back Door ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the O15 ECU connector.
3. Disconnect the resistance according to the value(s) in the table below.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   T9-1 - O15-26 (BZR+)	Always	Below 1 Ω
   T9-2 - Body ground	Always	Below 1 Ω
   T9-1 - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   10 

1. Check the wireless door lock operation.

   Result

   Result	Proceed to
   OK	A
   NG (w/ Smart key System)	B
   NG (w/o Smart key System)	C

   OK

   Hazard answer-back function operates normally.

B → See step   11 

C → See step   12 

A: Go to next step 

1. Replace the back door motor unit (power back door ECU), refer to REMOVAL .

NEXT: Go to next step 

1. Check that the power back door warning buzzer operates normally.

   OK

   It operates normally.

NG → REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK) 

OK → END (REPLACE BACK DOOR MOTOR UNIT (POWER BACK DOOR ECU) DEFECTIVE)