DTC B141A-15: Room Temperature Sensor Circuit Short to Battery or Open [08/2023 - ]: Procedure

Pre-procedure1

• Disconnect the C57 room temp. sensor (cooler thermistor) connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Room Temp. Sensor (Cooler Thermistor))

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C57-1 (+) - Body ground	Ignition switch ON	0 to 5.5 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

See step  5

Result: 

OK 

See step  2

1. Clear the DTCs.

   Body Electrical > Air Conditioner > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  3

Pre-procedure1

• Turn the ignition switch off.
• Disconnect the C57 room temp. sensor (cooler thermistor) connector.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Room Temp. Sensor (Cooler Thermistor))

• Connect terminals 1 and 2 of the room temp. sensor (cooler thermistor) connector on the wire harness side.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	Room Temp. Sensor (Cooler Thermistor)
  *2	Air Conditioning Amplifier Assembly

• Turn the ignition switch to ON and wait for 4 seconds or more.

• Check for DTCs.

  Body Electrical > Air Conditioner > Trouble Codes 

  Result

  Result	Proceed to
  B141A-11 is output	A
  B141A-15 is output	B

Post-procedure1

• None

Result: 

A 

REPLACE ROOM TEMP. SENSOR (COOLER THERMISTOR). Refer to  REMOVAL [10/2022 - ] 

Result: 

B 

See step  4

Pre-procedure1

• Disconnect the C57 room temp. sensor (cooler thermistor) connector.
• Disconnect the C48 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
  C57-1 (+) - C48-5 (TR)	Always	Below 1 Ω	Ω
  C57-2 (-) - C48-3 (SG-1)	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Disconnect the C57 room temp. sensor (cooler thermistor) connector.
• Disconnect the C48 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
  C57-1 (+) or C48-5 (TR) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR