DTC B1498: Communication Malfunction (A/C Inverter Local) [02/2019 - 06/2020]: Procedure

1. Using the Techstream, check if the CAN communication system is functioning normally.

   Refer to HOW TO PROCEED WITH TROUBLESHOOTING [02/2019 - ]

   Result

   Result	Proceed to
   CAN communication system DTCs are not output	A
   CAN communication system DTCs are output	B

Result: 

B 

GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2019 - ] 

Result: 

A 

See step  2

1. Check if hybrid control system DTCs are output.
   1. for 2WD: Refer to DTC CHECK / CLEAR [11/2018 - 08/2020]
   2. for AWD: Refer to DTC CHECK / CLEAR [02/2019 - 10/2022]

   Powertrain > Hybrid Control > Trouble Codes 

   Result

   Result	Proceed to
   DTCs are not output	A
   DTCs are output	B

Result: 

B 

GO TO HYBRID CONTROL SYSTEM 

1. for 2WD: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - 08/2020]
2. for AWD: Refer to HOW TO PROCEED WITH TROUBLESHOOTING [02/2019 - ]

Result: 

A 

See step  3

1. Disconnect the C52 compressor with motor assembly connector.
2. Disconnect the A29 hybrid vehicle control ECU assembly connector.
3. Disconnect the Q14 battery state sensor assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C52-3 (DOUT) - A29-8 (LIN3)	Always	Below 1 Ω
   C52-3 (DOUT) - A29-8 (LIN3) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Disconnect the compressor with motor assembly connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to Compressor with Motor Assembly)

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C52-2 (GND) - Body ground	Always	Below 1 Ω

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

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   C52-1 (IG1) - Body ground	Ignition switch ON	11 to 14 V
   	Ignition switch off	Below 1 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Remove the HV air conditioning wire.
   1. for 2WD: Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]
   2. for AWD: Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 06/2020]
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   Z1-2 (PB) - Z2-1 (ACPB)	Always	Below 1 Ω
   Z1-1 (PE) - Z2-2 (ACPE)	Always	Below 1 Ω
   Z1-2 (PB) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [02/2019 - 10/2019]  , or refer to  REMOVAL [10/2019 - 06/2020] 

Result: 

NG 

REPLACE HV AIR CONDITIONING WIRE 

1. for 2WD: Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]
2. for AWD: Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 06/2020]