DTC B0050-11: Driver Seat Belt Sensor Circuit Short to Ground [11/2020 - 12/2022]: Procedure

Pre-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

• Check that the connectors are properly connected to the airbag ECU assembly and front seat inner belt assembly LH.

  OK

  The connectors are properly connected.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

CONNECT CONNECTORS PROPERLY 

Result: 

OK 

See step  2

Pre-procedure1

• Disconnect the airbag ECU assembly connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Front Seat Inner Belt Assembly LH
  *2	Airbag ECU Assembly
  *3	Wire Harness
  *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)
  *b	Front view of wire harness connector (to Airbag ECU Assembly)

• Disconnect the front seat inner belt assembly LH connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  G23-2 (LBE+) - G23-1 (LBE-)	Always	1 MΩ or higher	MΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

• Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Front Seat Inner Belt Assembly LH
  *2	Airbag ECU Assembly
  *3	Wire Harness
  *a	Front view of wire harness connector (to Front Seat Inner Belt Assembly LH)
  *b	Front view of wire harness connector (to Airbag ECU Assembly)

• Turn the ignition switch to ON.

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

  Standard Voltage

  Tester Connection	Switch Condition	Specified Condition	Result
  G23-2 (LBE+) - Body ground	Ignition switch ON	Below 1 V	V
  G23-1 (LBE-) - Body ground	Ignition switch ON	Below 1 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Connect the airbag ECU assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front Seat Inner Belt Assembly LH
   *2	Airbag ECU Assembly
   *3	Wire Harness

2. Connect the front seat inner belt assembly LH connector.
3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
4. Turn the ignition switch to ON, and wait for at least 60 seconds.
5. Clear the DTCs stored in memory.

   Body Electrical > SRS Airbag > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

Pre-procedure1

• Turn the ignition switch off.
• Turn the ignition switch to ON, and wait for at least 60 seconds.

• Check for DTCs.

  Body Electrical > SRS Airbag > Trouble Codes 

  Result

  Result	Proceed to
  B0050-11 is not output	A
  B0050-11 is output	B

Post-procedure1

• None

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2020 - ] 

Result: 

B 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [11/2020 - 11/2021]  , or refer to  REMOVAL [11/2021 - 12/2022]