DTC B13A3-87: Front Right Radiation Heater Missing Message [08/2023 - ]: Procedure

Pre-procedure1

• Disconnect the a1 No. 2 quick heater and accessory assembly connector.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  a1-6 (+B) - Body ground	Ignition switch ON	11 to 14 V	V

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to No. 2 Quick Heater and Accessory Assembly)

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  a1-1 (GND) - 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  2

Pre-procedure1

• Disconnect the a1 No. 2 quick heater and accessory assembly connector.
• Disconnect the C49 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
  a1-4 (LIN) - C49-8 (LIN4)	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 ON-VEHICLE INSPECTION [08/2023 - ]

Result

Result: 

NG 

REPLACE NO. 2 QUICK HEATER AND ACCESSORY ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

Result: 

OK 

See step  4

1. Clear the DTCs.

   Body Electrical > Air Conditioner > Clear DTCs 

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   Result

   Result	Proceed to
   B13A2-87 is output	A
   B13A2-87 is not output	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

Result: 

B 

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