Power Back Door Warning System does not Operate [12/2019 - 11/2023]: Procedure

1. Check power back door system operation.

   Refer to OPERATION CHECK [12/2019 - 11/2023]

   Result

   Result	Proceed to
   Hazard warning light does not come on	A
   Power back door warning buzzer does not operate	B

Result: 

B 

See step  6

Result: 

A 

See step  2

1. Check wireless door lock operation.

   Refer to OPERATION CHECK [12/2019 - 11/2023]

   OK

   Hazard answer-back function operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO WIRELESS DOOR LOCK CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 11/2023] 

Result: 

OK 

See step  3

1. Temporarily replace the multiplex network door ECU with a new or known good one.

   Refer to REMOVAL [12/2019 - 11/2023]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Initialize the power back door system.

   Refer to INITIALIZATION [12/2019 - 11/2023]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Check that the power back door hazard warning lights operate normally.

   Refer to OPERATION CHECK [12/2019 - 11/2023]

   OK

   The power back door hazard warning lights operate normally.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

END (MULTIPLEX NETWORK DOOR ECU WAS DEFECTIVE) 

Result: 

NG 

REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU). Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

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

   Body Electrical > Back Door > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PBD Buzzer	Power back door warning buzzer sound	OFF or ON	-

   Body Electrical > Back Door > Active Test 

   Tester Display
   PBD Buzzer

   OK

   Power back door warning buzzer sounds

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

See step  7

1. Disconnect the M44 power back door warning buzzer connector.
2. Perform the Active Test according to the display on the GTS.

   Body Electrical > Back Door > Active Test 

   Tester Display	Measurement Item	Control Range	Diagnostic Note
   PBD Buzzer	Power back door warning buzzer sound	OFF or ON	-

   Body Electrical > Back Door > Active Test 

   Tester Display
   PBD Buzzer

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   M44-1 (BZR+) - M44-2 (BZR-)	Active Test PBD Buzzer is OFF	Below 1 V
   	Active Test PBD Buzzer is ON	Pulse generation (frequency: 2 kHz, high voltage: 11 to 14 V, low voltage: below 1 V)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Power Back Door Warning Buzzer)

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE POWER BACK DOOR WARNING BUZZER. Refer to  REMOVAL [12/2019 - ] 

Result: 

NG 

See step  8

1. Disconnect the W18 multiplex network door ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   M44-1 (BZR+) - W18-16 (BZR+)	Always	Below 1 Ω
   M44-2 (BZR-) - Body ground	Always	Below 1 Ω
   M44-1 (BZR+) or W18-16 (BZR+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU. Refer to  REMOVAL [12/2019 - 11/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR