Last Modified: 08-21-2023 6.11:8.1.0 Doc ID: RM100000001A3OY
Model Year Start: 2019 Model: Avalon HV Prod Date Range: [04/2018 -           ]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1498; Communication Malfunction (A/C Inverter Local); 2019 - 2022 MY Avalon HV [04/2018 -        ]

DTC

B1498

Communication Malfunction (A/C Inverter Local)

DESCRIPTION

The hybrid vehicle control ECU assembly and compressor with motor assembly communicate via direct line. Compressor control is stopped and this DTC is stored if communication information is cut off or abnormal information is received.

This DTC is also detected if high-voltage electricity supplied from the inverter with converter assembly to the compressor control circuit is shut off.

This DTC will be stored as a history DTC.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

B1498

Communication Malfunction (A/C Inverter Local)
  • Error or open in communication line between the hybrid vehicle control ECU assembly and compressor with motor assembly
  • High-voltage power source shut off
  • Harness or connector
  • Hybrid vehicle control ECU assembly
  • Compressor with motor assembly
  • HV air conditioning wire
  • Battery state sensor assembly

Memorized

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

  • Before inspecting the high-voltage system, take safety precautions such as wearing insulated gloves and removing the service plug grip to prevent electrical shocks. After removing the service plug grip, put it in your pocket to prevent other technicians from accidentally reconnecting it while you are working on the high-voltage system.
  • Do not touch the high-voltage connectors or terminals for 10 minutes after the service plug grip is removed.

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following procedure.
  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here 2019 - 2022 MY Avalon Avalon HV [04/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs for both systems are output simultaneously.
  • Depending on the timing of the power supply to the 12 V power supply circuit and high-voltage circuit when the power switch is turned on (READY), an abnormal information signal may be output, causing this DTC to be stored. If the output DTC is a code that was memorized in the past, check the fuses and wire harnesses. If there is no malfunction, clear the DTC.
  • The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.

    Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING 2021 - 2022 MY Avalon HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

PROCEDURE

1.

CHECK FOR DTC

(a) Check if hybrid control system DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

Both P058A01 and P162B87 are not output

A

P058A01 and P162B87 are output

B
B

GO TO STEP 7

A

2.

CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - IG POWER SOURCE AND BODY GROUND)

CAUTION:

Do not disconnect the connector on the high-voltage side.

(a) Disconnect the C66 compressor with motor assembly connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

C66-1 (IG1) - Body ground

Power switch on (IG)

11 to 14 V

Standard Resistance:

Tester Connection

Condition

Specified Condition

C66-2 (GND) - Body ground

Always

Below 1 Ω

NOTICE:

If the power switch is turned on (IG) with the connector disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): DTC CHECK / CLEAR 2021 - 2022 MY Avalon HV [08/2020 -        ]; HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): DTC CHECK / CLEAR

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - COMPRESSOR WITH MOTOR ASSEMBLY)

(a) Disconnect the A23 hybrid vehicle control ECU assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A23-17 (LIN3) - C66-3 (DOUT)

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Disconnect the T1 and T2 HV air conditioning wire connectors.

Click here 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2021 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T1-2 (PB) - T2-1 (ACPB)

Always

Below 1 Ω
NG

GO TO STEP 6

OK

5.

INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T1-1 (PE) - T2-2 (ACPE)

Always

Below 1 Ω
OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HEATING / AIR CONDITIONING: COMPRESSOR (for A25A-FXS): REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HEATING / AIR CONDITIONING: COMPRESSOR (for A25A-FXS): REMOVAL

NG

REPLACE HV AIR CONDITIONING WIRE 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2021 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL

6.

INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

T1-2 (PB) - Body ground

Always

10 kΩ or higher
OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HEATING / AIR CONDITIONING: COMPRESSOR (for A25A-FXS): REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HEATING / AIR CONDITIONING: COMPRESSOR (for A25A-FXS): REMOVAL

NG

REPLACE HV AIR CONDITIONING WIRE 2019 - 2020 MY Avalon HV [04/2018 - 08/2020]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2021 MY Avalon HV [08/2020 - 08/2021]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER: REMOVAL

7.

CHECK FOR DTC

(a) Disconnect the P8 battery state sensor assembly connector.

(b) Check if air conditioning system DTCs are output.

Body Electrical > Air Conditioner > Trouble Codes

Result

Proceed to

B1498 is not output

A

B1498 is output

B
A

REPLACE BATTERY STATE SENSOR ASSEMBLY 2019 MY Avalon HV [04/2018 - 08/2019]; A25A-FXS (BATTERY / CHARGING): BATTERY CURRENT SENSOR: REMOVAL 2020 - 2021 MY Avalon HV [08/2019 - 08/2021]; A25A-FXS (BATTERY / CHARGING): BATTERY CURRENT SENSOR: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; A25A-FXS (BATTERY / CHARGING): BATTERY CURRENT SENSOR: REMOVAL

B

8.

CHECK FOR DTC

(a) Connect the P8 battery state sensor assembly connector.

(b) Disconnect the C66 compressor with motor assembly connector.

(c) Check if hybrid control system DTCs are output.

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

Both P058A01 and P162B87 are not output

A

P058A01 and P162B87 are output

B
A

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HEATING / AIR CONDITIONING: COMPRESSOR (for A25A-FXS): REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HEATING / AIR CONDITIONING: COMPRESSOR (for A25A-FXS): REMOVAL

B

9.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU ASSEMBLY - COMPRESSOR WITH MOTOR ASSEMBLY AND BATTERY STATE SENSOR ASSEMBLY)

(a) Disconnect the A23 hybrid vehicle control ECU assembly connector.

(b) Disconnect the P8 battery state sensor assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

A23-17 (LIN3) - C66-3 (DOUT)

Always

Below 1 Ω

A23-17 (LIN3) - P8-2 (LIN)

Always

Below 1 Ω

A23-17 (LIN3) or C66-3 (DOUT) - Other terminals and body ground

Always

10 kΩ or higher

A23-17 (LIN3) or P8-2 (LIN) - Other terminals and body ground

Always

10 kΩ or higher
OK

REPLACE HYBRID VEHICLE CONTROL ECU 2019 - 2021 MY Avalon HV [04/2018 - 08/2021]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL 2022 MY Avalon HV [08/2021 -        ]; HYBRID / BATTERY CONTROL: HYBRID VEHICLE CONTROL ECU: REMOVAL

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR