DTC B1512-87: Lost Communication with Steering Switch Control Module Missing Message [12/2022 - ]: Procedure

Pre-procedure1

• Disconnect the K41 spiral cable sub-assembly connector.

• Check the signal waveform.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Spiral Cable Sub-assembly)

  HINT: 

  The waveform pattern changes according to signal.

  Standard

  Tester Connection	Condition	Specified Condition
  K41-1 (LIN) - Body ground	Ignition switch ON	Pulse generation

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

See step  5

Result: 

OK 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Standard Voltage

   Tester Connection	Condition	Specified Condition	Result
   K41-4 (BHT) - Body ground	Ignition switch ON	11 to 14 V	V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition	Result
   K41-2 (EHT) - Body ground	Always	Below 1 Ω	Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Refer to INSPECTION [12/2022 - ]

Result

Result: 

OK 

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

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [12/2022 - 03/2023]  , or refer to  REMOVAL [03/2023 - ] 

Pre-procedure1

• Disconnect the K18 combination meter assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  K41-1 (LIN) - K18-32 (CXPI)	Always	Below 1 Ω	Ω
  K41-1 (LIN) or K18-32 (CXPI) - Body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR