Last Modified: 01-30-2024 6.11:8.1.0 Doc ID: RM100000001FPHE
Model Year Start: 2019 Model: RAV4 HV Prod Date Range: [11/2018 - 02/2019]
Title: HEATING / AIR CONDITIONING: AIR CONDITIONING SYSTEM (for HV Model): B1498; Communication Malfunction (A/C Inverter Local); 2019 MY RAV4 HV [11/2018 - 02/2019]

DTC

B1498

Communication Malfunction (A/C Inverter Local)

DESCRIPTION

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

This DTC is also detected if high-voltage power 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)
  • Diagnosis condition: Power switch on (READY)
  • Malfunction status: Error or open in communication line between the hybrid vehicle control ECU assembly and compressor with motor assembly or high-voltage power source shut off
  • Harness or connector
  • Hybrid vehicle control ECU assembly
  • Compressor with motor assembly
  • HV air conditioning wire
  • CAN communication system
  • Hybrid control system

Memorized

WIRING DIAGRAM

CAUTION / NOTICE / HINT

CAUTION:

  • Wear insulated gloves and pull out the service plug grip before inspection as procedures may require disconnecting high-voltage connectors. Carry the removed service plug in your pocket to prevent other technicians from accidentally reconnecting it while you are servicing the vehicle.
  • 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 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): PRECAUTION

  • The hybrid control system and air conditioning system output DTCs separately. Perform troubleshooting for the hybrid control system first if DTCs from these 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.

PROCEDURE

1.

CHECK CAN COMMUNICATION SYSTEM

(a) Using the Techstream, check if the CAN communication system is functioning normally.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; NETWORKING: CAN COMMUNICATION SYSTEM (for HV Model): HOW TO PROCEED WITH TROUBLESHOOTING

Result

Proceed to

CAN communication system DTCs are not output

A

CAN communication system DTCs are output

B
B

GO TO CAN COMMUNICATION SYSTEM

A

2.

CHECK FOR DTC (HYBRID CONTROL SYSTEM)

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

Click here 2019 - 2020 MY RAV4 HV [11/2018 - 08/2020]; HYBRID / BATTERY CONTROL: HYBRID CONTROL SYSTEM (for 2WD with NICKEL METAL HYDRIDE BATTERY): DTC CHECK / CLEAR

Powertrain > Hybrid Control > Trouble Codes

Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO HYBRID CONTROL SYSTEM

A

3.

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

(a) Disconnect the C52 compressor with motor assembly connector.

(b) Disconnect the A29 hybrid vehicle control ECU assembly connector.

(c) Disconnect the Q14 battery state sensor assembly connector.

(d) 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
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - BATTERY AND BODY GROUND)

CAUTION:

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

(a) Disconnect the compressor with motor assembly connector.

*a

Front view of wire harness connector

(to Compressor with Motor Assembly)

(b) 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

(c) 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

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

INSPECT HV AIR CONDITIONING WIRE

CAUTION:

Be sure to wear insulated gloves.

(a) Remove the HV air conditioning wire.

Click here 2019 MY RAV4 HV [11/2018 - 02/2019]; HYBRID / BATTERY CONTROL: INVERTER WITH CONVERTER (for 2WD): REMOVAL

(b) 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
OK

REPLACE COMPRESSOR WITH MOTOR ASSEMBLY

NG

REPLACE HV AIR CONDITIONING WIRE