DTC B14B3-87: Lost Communication with Rear Panel LIN Missing Message [12/2023 - ]: Procedure

Pre-procedure1

• Disconnect the D110 No. 2 air conditioning control assembly connector.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  D110-9 (IG) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

Pre-procedure1

• Disconnect the D110 No. 2 air conditioning control assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  D110-7 (E) - 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

Pre-procedure1

• Disconnect the D110 No. 2 air conditioning control assembly connector.
• Disconnect the D36 air conditioning amplifier assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  D110-8 (RLIN) - D36-20 (RLIN)	Always	Below 1 Ω	Ω
  D110-8 (RLIN) or D36-20 (RLIN) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Pre-procedure1

• Disconnect the D110 No. 2 air conditioning control assembly connector.
• Connect the D36 air conditioning amplifier assembly connector.

• Using an oscilloscope, check the waveform.

  Item	Content
  Tester Connection	D36-20 (RLIN) - Body ground
  Tool Setting	2 V/DIV., 20 μs/DIV.
  Condition	Ignition switch ON

  OK

  The waveform displays properly.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  5

Pre-procedure1

• Connect the D110 No. 2 air conditioning control assembly connector.

• Using an oscilloscope, check the waveform.

  Item	Content
  Tester Connection	D110-8 (RLIN) - Body ground
  Tool Setting	2 V/DIV., 20 μs/DIV.
  Condition	Ignition switch ON

  OK

  The waveform displays properly.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [09/2023 - ] 

Result: 

NG 

REPLACE NO. 2 AIR CONDITIONING CONTROL ASSEMBLY. Refer to  REMOVAL [09/2023 - ]