DTC B1512-87: Lost Communication with Steering Switch Control Module Missing Message [12/2023 - ]: Procedure

Pre-procedure1

• Disconnect the D32 spiral cable sub-assembly connector.

• Using an oscilloscope, check the waveform.
  NOTE:

  The wave pattern changes according to CXPI communication signal.

  OK

  Tester Connection	Switch Condition	Specified Condition
  D32-1 (LIN) - Body ground	Ignition switch ON	Pulse generation

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

See step  4

Result: 

OK 

See step  2

Pre-procedure1

• Disconnect the D33 spiral cable sub-assembly connector.

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

  Standard Voltage

  Tester Connection	Switch Condition	Specified Condition	Result
  D33-4 (BHT) - Body ground	Ignition switch off	11 to 14 V	V

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  D33-2 (EHT) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Refer to INSPECTION [11/2020 - ]

Result

Result: 

OK 

REPLACE STEERING VIBRATION AND HEATER ECU. Refer to  REMOVAL [12/2023 - ] 

Result: 

NG 

REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [12/2023 - ] 

Pre-procedure1

• Disconnect the D199 combination meter assembly connector.
• Disconnect the D33 spiral cable sub-assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  D199-32 (CXP1) - D33-1 (LIN)	Always	Below 1 Ω	Ω
  D199-32 (CXP1) or D33-1 (LIN) - 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 [12/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR