DTC B1793-12: Load Sensor for Occupant Detection System Circuit Short to Battery [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 adjuster assembly RH.

  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 Adjuster Assembly RH
  *2	Airbag ECU Assembly
  *3	Wire Harness

• Disconnect the front seat adjuster assembly RH connector.

• Check that the terminals of the connectors are not deformed or damaged.

  OK

  The terminals are not deformed or damaged.

  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.
• Turn the ignition switch to ON.

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Front Seat Adjuster Assembly RH
  *2	Airbag ECU Assembly
  *3	Wire Harness
  *a	Front view of wire harness connector (to Airbag ECU Assembly)
  *b	Front view of wire harness connector (to Front Seat Adjuster Assembly RH (Front Occupant Classification Sensor LH))
  *c	Front view of wire harness connector (to Front Seat Adjuster Assembly RH (Rear Occupant Classification Sensor LH))

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  R1-24 (SVC) - Body ground	Ignition switch ON	Below 1 V	V
  a17-1 - Body ground	Ignition switch ON	Below 1 V	V
  a18-1 - Body ground	Ignition switch ON	Below 1 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [12/2022 - 03/2023]  , or refer to  REMOVAL [03/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR