Power Back Door Warning System does not Operate [10/2023 - ]: Procedure

1. Operate the power back door and check that the warning buzzer and hazard warning light operate.

   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.

   for HV Model:

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

   for Gasoline Model:

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

   OK

   Hazard answer-back function operates normally.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

GO TO WIRELESS DOOR LOCK CONTROL SYSTEM 

for HV Model:

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

for Gasoline Model:

Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ]

Result: 

OK 

See step  3

1. Temporarily replace the multiplex network door ECU with a new or normally functioning one.

   Refer to REMOVAL [10/2023 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  4

1. Perform the initialization for the multiplex network door ECU.

   Refer to INITIALIZATION [10/2023 - ]

   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 [10/2023 - 11/2024] , or refer to OPERATION CHECK [11/2024 - ]

   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 [10/2023 - ]

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 (Small Volume)	Power back door warning buzzer sound (small volume)	Start	-
   PBD Buzzer (Middle Volume)	Power back door warning buzzer sound (Middle volume)	Start	-
   PBD Buzzer (Large Volume)	Power back door warning buzzer sound (Large volume)	Start	-

   Body Electrical > Back Door > Active Test 

   Tester Display
   PBD Buzzer (Small Volume)

   Body Electrical > Back Door > Active Test 

   Tester Display
   PBD Buzzer (Middle Volume)

   Body Electrical > Back Door > Active Test 

   Tester Display
   PBD Buzzer (Large Volume)

   OK

   Power back door warning buzzer sounds.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU 

Refer to REMOVAL [10/2023 - ]

Result: 

NG 

See step  7

1. Disconnect the Q2 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 (Middle Volume)	Power back door warning buzzer sound (Middle volume)	Start	-

   Body Electrical > Back Door > Active Test 

   Tester Display
   PBD Buzzer (Middle Volume)

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   Q2-1 (BZR+) - Q2-2 (BZR-)	Active Test "PBD Buzzer (Middle Volume)" is not performed	Below 1 V
   	Active Test "PBD Buzzer (Middle Volume)" is being performed	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 [10/2023 - ]

Result: 

NG 

See step  8

1. Disconnect the Q2 power back door warning buzzer connector.
2. Disconnect the R26 multiplex network door ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Q2-1 (BZR+) - R26-1 (BZR+)	Always	Below 1 Ω
   Q2-2 (BZR-) - Body ground	Always	Below 1 Ω
   Q2-1 (BZR+) or R26-1 (BZR+) - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE MULTIPLEX NETWORK DOOR ECU 

Refer to REMOVAL [10/2023 - ]

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR